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  • Three-dimensional inviscid analysis of radial turbine

    The three-dimensional inviscid DENTON code is used to analyze flow through a radial-inflow turbine rotor. Experimental data from the rotor are compared with analytical results obtained by using the code. The experimental data available for comparison are the radial distributions of circumferentially averaged values of absolute flow angle and total pressure downstream of the rotor exit.

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  • Three-Dimensional Navier-Stokes Simulations of Turbine ...

    2014-6-16 · In the present study the approximation of two-dimensional-ity is removed, and three-dimensional airfoil geometries are used. In addition , the hub outer casing and rotor-tip clear-anc e ar all include d in th calculation. A system of patche and overlaid grids is used to discretize the rather complex geometry of the three-dimensional configuration.

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  • Three-dimensional unsteady stator-rotor interactions

    2021-2-15 · To the authors’ knowledge, the present study is the first CFD investigation of a ORC turbine stage with a pressure ratio larger than 100 which accounts for the combination of real gas effects, unsteady stator/rotor interaction, and three-dimensional effects.

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  • Three dimensional flow at the junction between a

    Abstract. A visualization of the flow on the suction side and end-wall of a passage between two neighboring turbine blades is compared with mass (heat) transfer measurements on the same surfaces. Besides the horseshoe and passage vortices, there are several smaller vortices formed near the junction of blade and end-wall whose origins are discussed.

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  • Analysis of Wind Turbine Pressure Distribution and 3D ...

    2016-2-5 · This research focused on the horizontal axis wind turbine. A test wind turbine has a three-bladed rotor with a radius of 1.2 m. The test blades for this experiment were made from Polyurethane. The test blade is twisted and tapered blade design using the Blade Element Momentum Theory (BEMT) like commercial wind

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  • Modelling Built-up Steam Turbine Rotor Using Finite ...

    2017-3-14 · A single stage of a built-up turbine rotor consisting of a turbine disc shrink fitted onto a cylindrical shaft will be modelled using the finite difference method. Three sources of rotor stress will be considered in this model: 1. Body forces due to the inertia of the disc and attached turbine blades, 2.

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  • DYNAMIC PERFORMANCE OF FLETTNER ROTORS WITH

    2011-5-14 · Three-dimensional, time-dependent computations have been carried out with the in-house flow solver STREAM. It is a finite-volume, general-geometry code with a collocated grid, using Cartesian velocity decomposition. The pressure is obtained through the SIMPLE algorithm. The bounded high-

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  • Vibration Analysis of Turbine Rotor System

    The material of the turbine is chosen as K418 nickel based cast alloy. ,The material of the shaft is 42CrMo. The material coefficients of the turbocharger rotor are shown in table 1. Table 2 presents the parameters of the turbocharger rotor system. Table 1. The material coefficients of the turbocharger rotor . Young Modulus (GPa) Density ( kg/m

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  • Appendix B: Problems - Wiley

    3.2 An inventor proposes to use a rotating cylinder to produce lift in a new wind energy device. The cylinder will be D¼0.75m in diameter and will be H¼7.5m high. It will rotate with a speed of n¼60rpm. (a) Recall that circulation around a cylinder is the integral of the tangential velocity about its perimeter. Show that the circulation is given by:

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  • Reducing rotor secondary losses in a turbine stage

    The rotor blade of an experiment turbine for low Reynolds number flow conditions is recontoured on the hub endwall to reduce the hub’s secondary flow losses. The baseline rotor blade is radially stacked with airfoils of free vortex twisting. The hub section airfoil of the rotor blade is reprofiled for three considerations. The first is to reduce the inlet metal angle to fit with the vane’s ...

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  • Three-Dimensional Navier-Stokes Simulations of Turbine ...

    2014-6-16 · In the present study the approximation of two-dimensional-ity is removed, and three-dimensional airfoil geometries are used. In addition , the hub outer casing and rotor-tip clear-anc e ar all include d in th calculation. A system of patche and overlaid grids is used to discretize the rather complex geometry of the three-dimensional configuration.

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  • Topological structures of three-dimensional vortex

    2012-8-17 · Topological structures of three-dimensional vortex flow separation. U. DALLMANN; ... Flow visualization and topological analysis of a turbine rotor cascade with tip clearance. Journal of Thermal Science, Vol. 6, No. 3 ... The computed structure of a 3-D turbulent interaction caused by a cylinder/offset-flare juncture.

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  • Modelling Built-up Steam Turbine Rotor Using Finite ...

    2017-3-14 · A single stage of a built-up turbine rotor consisting of a turbine disc shrink fitted onto a cylindrical shaft will be modelled using the finite difference method. Three sources of rotor stress will be considered in this model: 1. Body forces due to the inertia of the disc and attached turbine blades, 2.

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  • Analysis of Wind Turbine Pressure Distribution and 3D ...

    2016-2-5 · surface. Detailed flow measurements on wind turbine blade were performed in a wind tunnel. The test wind turbine has a three-bladed rotor with a radius of 1.2m. Each blade is twisted and tapered as same as commercial wind turbine blade. The maximum power coefficient of the test wind turbine is 0.43 at the tip speed ratio of 5.2.

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  • Turbine Gas - Doosan Heavy Industries & Construction

    2017-4-3 · The first and second stage vanes on the turbine rotor are free-standing. The third and fourth stages have integral shrouds. The compressor blade path is designed using a three-dimensional flow-field analysis computer program. Rotor blades are double circular arc designs in the first four stages. Stationary blading, fabricated into two 180

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  • 1,* , Rakesh Ravi 1, Johannes Rieke 2 and Falk Heinecke

    2021-5-5 · sensor was used to measure the three dimensional deformation of the rotor blade. The twisting of the rotor blade root and the rotation of the load frames were measured using angle measurement sensors. 90 +45 0-45 1600 2700 3800 5000 8000 17,000 15,000 13,000 11,000 LF1LF2 LF3 LF4 y z x Figure 2.

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  • The Calculation of Three Dimensional Viscous Flow

    The extension of a well established three dimensional flow calculation method to calculate the flow through multiple turbomachinery blade rows is described in this paper. To avoid calculating the unsteady flow, which is inherent in any machine containing both rotating and stationary blade rows, a mixing process is modelled at a calculating ...

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  • Numerical Study of the Heat Transfer in Micro Gas

    2006-10-11 · It combines a three-dimensional (3D) conduction calculation inside the rotor and the stator with a 3D flow calculation in the radial compressor, turbine and gap between stator and rotor. The results for micro gas turbines of different size and shape and different material characteristics are presented and the impact on performance is evaluated.

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  • Multi Rotor Wind Turbine Design And Cost Scaling

    2020-10-13 · In this thesis the NREL 5 MW single rotor baseline wind turbine is compared with a 5 MW multi-rotor wind turbine. The multiple rotors are downscaled using scaling curves keeping the 5 MW baseline machine as reference. v

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  • Appendix B: Problems - Wiley

    Assume that the wind turbine is operating under standard atmospheric conditions (r¼1.225kg/m3). Assume a turbine efficiency of 0.4. 2.2 A 40m diameter, three-bladed wind turbine produces 700kW at a wind speed (hub height) of 14m/s. The air density is 1.225kg/m3. Find: (a) The rotational speed (rpm) of the rotor at a tip speed ratio of 5.0.

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  • Three-dimensional Navier-Stokes simulations of

    2012-5-23 · Three-dimensional Navier-Stokes simulations of turbine rotor-stator interaction. Part I - Methodology. Man Mohan Rai; ... Quasi-three-dimensional calculation for the effect of axial gap variation on the performance of an advanced compressor stage. Gerald Micklow and ...

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  • Three-Dimensional Design and Optimization of a

    2013-3-25 · Attenuation of Vane Distortion in a Transonic Turbine using Optimization Strategies, Part I – Methodology, Part II – Optimization,” ASME Paper Nos. GT2010-22370 and GT2010-22371. 22. Arnone, A., 1994, “ Viscous Analysis of Three-Dimensional Rotor Flow Using a Multigrid Method,”

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  • Unsteady and three-dimensional aerodynamic effects

    2020-1-5 · Unsteady and three-dimensional aerodynamic effects on wind turbine rotor loads. The paper investigates the use of vortex methods in the computation of important flows for wind turbine aerodynamics. These flows are characterised by inflow velocity unsteadiness, spatial variations and non-zero spanwise component.

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  • Three-dimensional wind turbine positioning using

    2018-1-1 · At a point with distance x away from the turbine rotor along the streamwise direction, the radius of the wake affected area is denoted as r w, calculated by (2) r w = α x + r r, where r r is the rotor radius of the turbine, and the entrainment constant α is calculated according to the hub height of the turbine and the roughness length through ...

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  • Modeling the Turbine Rotor Journal Restoration

    2017-1-1 · Modeling the Turbine Rotor Journal Restoration Located on Cylindrical Surface of the Supporting Bearer ... In this case, the directional line of the bearing cylinder is the circle, and the directional line of the rotor journal cylinder is the ellipse (Fig. 1, at the right). So the three-dimensional scheme is changed by two-dimensional one with ...

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  • Computational Modeling of Three-Dimensional

    2015-2-18 · Ho, Y, & Lakshminarayana, B. 'Computational Modeling of Three-Dimensional Endwall Flow Through a Turbine Rotor Cascade With Strong Secondary Flows.' Proceedings of the ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. Volume 1: Turbomachinery. The Hague, Netherlands. June 13–16, 1994. V001T01A046. ASME.

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  • Modeling of the Turbine Rotor Journal Restoration on ...

    2016-1-1 · During the normal operational life of a turbine, its rotor journal seating surfaces are wearing and therefore, repair operations, including turning and grinding of such surfaces and next rotor balancing on the balancing machines, are carried out. ... Accepting that roller bearing surfaces represent circular cylinder, the three-dimensional ...

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  • Vibration Analysis of Turbine Rotor System

    Turbine impeller 11 64 16 22.2 Compressor impeller 10 66 13 17.7 Shaft 173 . Fig. 1. The model of turbine rotor system . Because the structure of body structure of turbine rotor system was very complex, we should simplify the structure first. This paper exports the equations of the system. [M]{X} [K]{X} 0 (1)

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  • Computational Modeling of Three-Dimensional

    1996-4-1 · A steady, three-dimensional Navier–Stokes solver that utilizes a pressure-based technique for incompressible flows is used to simulate the three-dimensional flow field in a turbine cascade. A new feature of the numerical scheme is the implementation of a second-order plus fourth-order artificial dissipation formulation, which provides a ...

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  • Effect of rotor aspect ratio and solidity on a straight ...

    2020-3-20 · the rotor aspect ratio, rather than the ratio of the diameter and blade span length. Compared with the H/D = 1.2, the circulation amount ratio of H/D = 0.9 indicates a large negative value in the blade center position. Keywords: Straight-bladed vertical axis wind turbine, Rotor aspect ratio, Solidity, Three-dimensional analysis, Panel method.

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  • Fleet360* Total Plant Service Solutions Steam Turbine ...

    2020-8-26 · The routine use of three-dimensional (3D) blading has allowed many traditional efficiency limitations to be overcome. With 3D ... turbine are reduced through the enhanced shaping of blade ... The new rotor had three more stages in the HP section to help provide the additional power required. The retrofit cylinder

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  • Aerodynamic wind-turbine rotor design using

    In this paper a surrogate optimization methodology using a three-dimensional viscous-inviscid interaction code for the aerodynamic design of wind-turbine rotors is presented. The framework presents a unique approach because it does not require the commonly-used blade element momentum (BEM) method. The three-dimensional viscous-inviscid interaction code used here is the accurate and fast MIRAS ...

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  • Three-Dimensional Multi-Objective Design

    2012-5-23 · Three-Dimensional Design and Optimization of a Transonic Rotor in Axial Flow Compressors 25 March 2013 | Journal of Turbomachinery, Vol. 135, No. 3 Uncertainty-based robust aerodynamic optimization of rotor blades

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  • Influence of Extension Length of Rotor End Windings

    2020-3-26 · As the capacity of turbine generator increases, this effect of rotor end windings has become more prominent. To investigate influence of the extension length of rotor end windings on the electromagnetic and thermal fields in the turbine generator end zone with magnetic screen, three-dimensional transient electromagnetic field model of 1250 MW ...

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  • Computations of a Film Cooled Turbine Rotor Blade

    A numerical investigation of film cooling on a turbine rotor blade has been carried out. The computations were performed with a 3D-Navier-Stokes code utilizing an unstructured solution adaptive grid methodology (Dawes (1992)). The code uses a low Reynolds number k-epsilon model for prescribing the Reynolds stresses.

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  • GTL Reports — MIT Gas Turbine Laboratory

    'Three-Dimensional Inviscid Flow Through A Highly-Loaded Transonic Compressor Rotor', 1976, 126. McGahan, W., 'The Incompressible, Turbulent Wall Jet in a an Adverse Pressure Gradient', 1965, 82.

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  • Aerodynamic wind-turbine rotor design using surrogate ...

    2017-11-8 · Aerodynamic wind-turbine rotor design using surrogate modeling and three-dimensional viscous-inviscid interaction technique In this paper a surrogate optimization methodology using a three-dimensional viscous-inviscid interaction code for the aerodynamic design of wind-turbine …

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  • Three-dimensional flows and loss generation

    Effects of the incidence on cascade three-dimensional flows and on the associated loss mechanism occurring in a low-speed linear turbine rotor cascade are described. For five different incidences from 7.2 to -53.3 degrees, the cascade flow was surveyed in detail at fifteen or sixteen planes located axially throughout the cascade. Blade-to-blade flows at the cascade midspan and near the ...

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  • A review on the wake aerodynamics of H-rotor

    Effect of rotor aspect ratio and solidity on a straight-bladed vertical axis wind turbine in three-dimensional analysis by the panel method Energy , 121 ( 2017 ) , pp. 1 - 9 Article Download PDF CrossRef View Record in Scopus Google Scholar

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  • Three-Dimensional Unsteady Flow in a Single Stage

    Abstract. In this paper the importance of unsteady flow effects is demonstrated for the accelerated turbine and decelerated compressor flow. For the understanding of the entire core flow in turbomachines, it is necessary to investigate the unsteady three-dimensional flow field inside the blade passages.

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  • Fleet360* Total Plant Service Solutions Steam Turbine ...

    2020-8-26 · The routine use of three-dimensional (3D) blading has allowed many traditional efficiency limitations to be overcome. With 3D ... turbine are reduced through the enhanced shaping of blade ... The new rotor had three more stages in the HP section to help provide the additional power required. The retrofit cylinder

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  • J. Fluid Mech. (2017), . 813, pp. https://doi.org/10.1017 ...

    2020-1-16 · 2.1. Turbine rotor and cylinder geometry Three model turbine rotors were ‘3D printed’ using a polycarbonate-like material (3D Systems Accurar 60 Plastic); each model was sanded to give a smooth surface finish. Each rotor blade consisted of a NACA 0018 airfoil with a …

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  • Damage model of turbine rotor based on DPLS

    2021-4-28 · refl ect the stress and damage data of turbine rotor in the whole start-up process. In the past, only three-dimensional modeling of turbine rotor was carried out in the research of steam turbine, which was imported into the fi nite element analysis software (commercial ANSYS, ADINA, …

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  • Dynamic Stability Analysis of a Flexible Rotor Filled

    2018-11-8 · This paper deals with the dynamic stability of a flexible liquid-filled rotor. On the basis of three-dimensional flow, the fluid perturbation motion is analyzed and the fluid–structure interaction equation is established, combining with continuity equation, the expression of fluid force exerted on rotor is derived in terms of Fourier series expansion.

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  • DYNAMIC PERFORMANCE OF FLETTNER ROTORS WITH

    2011-5-14 · greater than 4. Further experiments with a bare rotor have been reported by Reid (1924) with a view to possible use on aircraft and by Bergeson & Greenwald (1985) for a rotor mounted on a test vessel. More than 75 years on from Thom’s experiments, computational studies of the spinning cylinder …

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  • Transition to bluff-body dynamics in the wake of

    2.1 Turbine rotor and cylinder geometry. Three model turbine rotors were ‘3D printed’ using a polycarbonate-like material (3D Systems Accura ® 60 Plastic); each model was sanded to give a smooth surface finish. Each rotor blade consisted of a NACA 0018 airfoil with …

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  • State-of-the-Art Cooling Technology for a Turbine

    2018-6-14 · @article{osti_1461194, title = {State-of-the-Art Cooling Technology for a Turbine Rotor Blade}, author = {Town, Jason and Straub, Douglas and Black, James and Thole, Karen A. and Shih, Tom I-P.}, abstractNote = {Effective internal and external cooling of airfoils is key to maintaining component life for efficient gas turbines. Cooling designs have spanned the range from simple internal ...

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  • Experimental and Numerical Investigation of Sealing ...

    2003-10-20 · Three-dimensional unsteady CFD ... rotor blades was a simple cylinder of 12.5mm diameter (not airfoil-shaped) to simulate the upstream potential effect, so their diameter was set similar to those of high-pressure turbine first stage rotor blades of actual engines. In addition, these rotor blades were ...

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  • An Investigation of Turbine Wheelspace Cooling Flow ...

    turbine inlet guide vane, a complete sector of the upper wheelspace, buffer and trench cavities, and equivalent flow blockages for a blade row represented as leading edge cylinders. The geometry is three-dimensional including all sealing features of the wheelspace. The vane and blade rows can be clocked to any relative position.

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  • Performance analysis of wells turbine blades using the ...

    Three dimensional numerical simulations are performed by Thakker et al. [14] in order to analyze the performance of a Wells turbine with CA9 blade profile, a maximum efficiency of 70% is obtained. Moreover, Kim et al. [15] uses numerical simulation to study the effect of the blade sweep on the performance of a Wells

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