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

    2014-6-16 · Three-Dimensional Navier-Stokes Simulations of Turbine Rotor-Stator Interaction; Part I - Methodology ... End-wall and tip-leakage effects and the geometry of the air-foils may contribute significantly to the three-dimensionality of the flow. Hence, an accurate simulation of the flow within ... Three-Dimensional Navier-Stokes Simulations of Turbine

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  • Three-dimensional flow simulation of transient power ...

    2013-5-23 · The transient power failure process of a prototype pump-turbine was studied numerically by three-dimensional (3-D) simulations. Fluid coupling and dynamic mesh (DM) method were used to calculate the rotational speed of the runner. Simulations were performed based on turbulence model. Specific transient characteristics, such as the flow rate, head, rotational speed, were analyzed.

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  • Flow visualization and the three-dimensional flow in

    2012-5-23 · American Institute of Aeronautics and Astronautics 12700 Sunrise Valley Drive, Suite 200 Reston, VA 20191-5807 703.264.7500

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  • Review of positive slopes on pump performance ...

    2019-9-1 · Kawamoto et al. conducted a systematic investigation on the performance of three pump-turbine models with different guide vane height and runner vane thickness. It was discovered that a 5% decrease in the corresponding discharges of the saddle peak and the BEP on the H ∼ Q curve could be achieved by increasing the runner vane thickness by 5%.

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  • Three-Dimensional Calculation of Air-Water Two

    1993-12-1 · To predict the behavior of gas-liquid two-phase flows in a centrifugal pump impeller, a three-dimensional numerical method is proposed on the basis of a bubbly flow model. Under the assumption of homogeneous bubbly flow entraining fine bubbles, the equation of motion of the mixture is represented by that of liquid-phase and the liquid velocity ...

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  • Energy Analysis in a Pump-Turbine During the Load ...

    However, the underlying fluid mechanism is not clear. In order to solve these problems, in this study, a three-dimensional (3D) transient turbulent flow in a pump-turbine, with clearance during the load rejection process, was simulated using the method of coupling of the rigid rotor motion with flow and dynamic mesh technology.

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  • Accuracy of Three-Dimensional (3D) Printed Dental

    Digital impression devices are used alternatively to conventional impression techniques and materials. The aim of this study was to evaluate the precision of extraoral digitalization of three types of photosensitive resin polymers used for 3D printing with the aid of a digital extraoral optical scanner. The alignment of the scans was performed by a standard best-fit alignment.

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  • Study on an innovative three-dimensional wind

    2018-9-15 · An original analytical three-dimensional wind turbine wake model is presented. The expression of wake model is simple and its computational cost is low. The accuracy of wake model is validated by the wind tunnel measured data. The wake model has a good accuracy beyond the 5D downwind of distance.

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  • The Flowfield Calculations of a Centrifugal Pump With ...

    2014-12-24 · In the present study, a finite volume computational method is used to solve the three-dimensional Reynolds-averaged flow field of an impeller with a volute. The study is aimed at the understanding of the effect of volute on the performance of impeller and its associated unsteady effect.

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  • A Quasi-Three Dimensional Analysis of Choking Flow

    2015-4-17 · A quasi-three dimensional.flow analysis has previously been reported for a mixed flow impeller by one of the present authors. In the analysis, the velocity gradient method has been used in meridional plane and the rotating annular cascade theory has been used for blade-to-blade solution.

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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

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  • Three Dimensional Heat Transfer Analysis of High

    2010-2-16 · 'Three Dimensional Heat Transfer Analysis of High Pressure Turbine Blade.' Proceedings of the ASME Turbo Expo 2009: Power for Land, Sea, and Air. Volume 3: Heat Transfer, Parts A and B. Orlando, Florida, USA. June 8–12, 2009. pp. 71-79. ASME.

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  • Three-Dimensional Calculations of the Flow Field

    Injection of coolant air from a showerhead injection system at the leading edge of a high pressure turbine blade is investigated using a fully implicit three-dimensional finite-volume method on multi-block grids. For various blowing rates, the calculation results for the velocity and pressure fields and turbulence intensity are compared with available experimental data.

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  • Three-Dimensional Simulation of Air Entrainment in a

    The three-dimensional unsteady vortex flow in a sump pump is investigated by the computational fluid dynamics (CFD) method with the shear-stress transport (SST) k − ω model and the volume of fluid (VOF) multiphase model. The helicity density, involving both velocity and vortex, is especially used to discuss the mechanism of the process for air entrainment.

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  • Acoustic streaming in an ultrasonic air pump with

    Acoustic streaming in an ultrasonic air pump with three-dimensional finite-difference time-domain analysis and comparison to the measurement Ultrasonics. 2014 Dec;54(8):2119-25. doi: 10.1016/j.ultras.2014.06.015. Epub 2014 Jun 24. Authors Yuji Wada 1 ...

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  • Three-Dimensional Air Flow Patterns Within a

    Flowfield simulation techniques of computational fluid dynamics are used to analyze the three-dimensional air flow behavior in a ball bearing which is caused by rotating and orbiting balls. A simplified model of ball bearing geometry with cage is adopted in this numerical study. A significantly low pressure region is found around the ball ...

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  • Multi-Dimensional Platform for Cooling Design of Air ...

    2013-7-9 · Progresses in conjugate heat transfer simulation method provide a new approach for turbine blade cooling design. The procedure of air-cooled blade design introduced in this paper consists of two levels, a schematic design using 1D flow network calculation method, and a detailed design based on CFX conjugate heat transfer simulation.

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  • Three-dimensional printing with nano-enabled

    1. Indoor Air. 2018 Nov;28(6):840-851. doi: 10.1111/ina.12499. Epub 2018 Sep 3. Three-dimensional printing with nano-enabled filaments releases polymer particles containing carbon nanotubes into air.

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  • - Pump Characteristic Curves

    2021-6-23 · Curves. The performance of a centrifugal pump can be shown graphically on a characteristic curve. A typical characteristic curve shows the total dynamic head, brake horsepower, efficiency, and net positive Suction head all plotted over the capacity range of the pump. Figures 5, 6, & 7 are non-dimensional curves which indicate the general shape ...

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  • Three Dimensional Health - Home | Facebook

    Three Dimensional Health. April 29 at 7:29 AM ·. Ditch the diet and break up with the diet industry all together, email me or call me directly to see how my unique approach might be a good fit for you. [email protected] 727-336-0660.

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  • Three-Dimensional Gas Turbine Combustor Emissions

    2015-3-3 · Applied Mechanics Reviews ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part B: Mechanical Engineering ASME Letters in Dynamic Systems and Control

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  • Computational Fluid Dynamics Modeling Three

    2013-12-15 · Air turbines are widely used to convert kinetic energy into power output in power engineering. The unsteady performance of air turbines with partial admission not only influences the aerodynamic performance and thermodynamic efficiency of turbine but also generates strong excitation force on blades to impair the turbine safely operating. Based on three-dimensional viscous …

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  • Three-Dimensional Optimization of a Gas Turbine

    2012-5-22 · A three-dimensional approach to the optimization of a gas turbine disc and blade attachment. R. ALDERSON , M. TANI , R. HILL and. D. TREE. 11th Propulsion Conference August 2012. 3D Optimization of the Fir-tree Design on the Turbine Disk/Blade attachment. Jian Ming Lee ,

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  • Three-Dimensional Boundary Layer in a Turbine Blade ...

    2017-1-20 · Abstract. The boundary layer on the end wall of a turbine blade cascade is subject to cross-stream pressure gradients in the blade passage, which generate a cross-stream velocity component to make it three dimensional. This distorts the turbulence relative to a two-dimensional boundary layer and impacts the end wall heat transfer.

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  • Three-Dimensional Simulation of Air Entrainment in a

    The three-dimensional unsteady vortex flow in a sump pump is investigated by the computational fluid dynamics (CFD) method with the shear-stress transport (SST) k − ω model and the volume of fluid (VOF) multiphase model. The helicity density, involving both velocity and vortex, is especially used to discuss the mechanism of the process for air entrainment.

    Get Price
  • Experiments With Three Dimensional Passive Flow

    2008-11-11 · Bohl, DG, & Volino, RJ. 'Experiments With Three Dimensional Passive Flow Control Devices on Low-Pressure Turbine Airfoils.' Proceedings of the ASME Turbo Expo 2005: Power for Land, Sea, and Air.

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  • Aero-Structural Optimization of an Axial Turbine

    2010-12-22 · Sivashanmugam, VK, Arabnia, M, & Ghaly, W. 'Aero-Structural Optimization of an Axial Turbine Stage in Three-Dimensional Flow.' Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air.

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  • A New Method for Casting Three‐Dimensional

    2011-1-1 · Abstract: Dental stone is used as the major material for recovering three‐dimensional shoeprints and tire tracks from crime scenes. The procedure for using dental stone sparsely changed over the years. There are two common methods for mixing dental stone: (i) a premeasured amount of dental stone is put in a zip‐lock bag to which water is added, and (ii) the water and dental stone are …

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  • A pilot study of bioaerosol reduction using an air ...

    2010-10-15 · The use of a dental turbine handpiece, three-in-one syringe or ultrasonic scaling instrument has been reported to increase bioaerosol levels dramatically. 5,9,10,11 The microbial component of ...

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  • Demonstration of a low-frequency three-dimensional ...

    2015-1-16 · The brightness of a light source defines its applicability to nonlinear phenomena in science. Bright low-frequency terahertz (<5 THz) radiation confined to a diffraction-limited spot size is a ...

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  • Acoustic streaming in an ultrasonic air pump with

    Acoustic streaming in an ultrasonic air pump with three-dimensional finite-difference time-domain analysis and comparison to the measurement Ultrasonics. 2014 Dec;54(8):2119-25. doi: 10.1016/j.ultras.2014.06.015. Epub 2014 Jun 24. Authors Yuji Wada 1 ...

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  • I have it—You want it! Bien-Air ... - Dental Economics

    2012-5-3 · A test rig for Steam Turbine Control Valves is operated at the Laboratory of Turbomachinery of the Helmut-Schmidt-University in Hamburg. The control valve unit containing four independently operable valves is a mockup of a typical steam turbine design converted for the use of compressed air with a maximum of 4 bar.

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  • Three-Dimensional Flow Separations in the Diffuser of

    2011-3-1 · Boiko, A, Govorushchenko, Y, & Burlaka, M. 'New Method and Algorithm of Three-Dimensional Turbine Guide Blade Rim Optimization.' Proceedings of the ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels.

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  • New Method and Algorithm of Three-Dimensional

    2008-11-24 · Unsteady three-dimensional flow fields in a transonic axial compressor rotor (NASA Rotor 37) have been investigated by unsteady Reynolds-averaged Navier-Stokes simulations. The simulations show that the breakdown of the tip leakage vortex occurs in the compressor rotor because of the interaction of the vortex with the shock wave.

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  • Unsteady Three-Dimensional Flow Phenomena Due to

    2012-5-3 · Hafner, MA, Holst, TA, & Billington, SA. 'Blade Tip Measurement Advanced Visualization Using a Three Dimensional Representation.' Proceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition.

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  • Blade Tip Measurement Advanced Visualization Using

    2016-12-14 · Tooth regeneration through stem cell-based therapy is a promising treatment for tooth decay and loss. Human dental pulp stem cells (hDPSCs) have been widely identified as the stem cells with the most potential for tooth tissue regeneration. However, the culture of hDPSCs in vitro for tissue engineering is challenging, as cells may proliferate slowly or/and differentiate poorly in vivo.

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  • Three-dimensional simulated microgravity culture

    2019-7-31 · Three-Dimensional Unsteady Turbulent Flow and Excitation Force in Partial Admission Air Turbine YonghuiXie, 1 KekeGao, 1 JibingLan, 1 andGongnanXie 2 School of Energy and Power Engineering, Xi an Jiaotong University, Xi an, Shaanxi , China

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  • Research Article Computational Fluid Dynamics Modeling ...

    Three-dimensional interconnected core–shell networks with Ni(Fe)OOH and M–N–C active species together as high-efficiency oxygen catalysts for rechargeable Zn–air batteries† Jiting Zhang , a Meng Zhang , a Lingxi Qiu , a Yan Zeng , b Jisheng Chen , a Chengzhou Zhu , b Ying Yu a and Zhihong Zhu * a

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  • Three-dimensional interconnected core–shell

    2012-3-19 · Scheme of a three-dimensional woodpile photonic crystal 43. The woodpile is composed of a first layer (gray) of periodically arranged dielectric rods with rod spacing a , a second orthogonal layer (blue), a third layer (red) laterally displaced by half the rod spacing with respect to the first layer, and a fourth layer (green) displaced with ...

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  • Fully Three-Dimensional Viscous Semi-Inverse

    2010-2-16 · A new semi-inverse design method for turbomachinery blading is proposed in this paper. Built on a time-marching Reynolds-Averaged Navier-Stokes solver, the proposed design method takes pressure loading, blade tangential thickness, blade stacking line, and flow path contour as prescribed quantities and computes the corresponding three-dimensional blade camber surface.

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  • Three-dimensional simulations of premixed

    The dynamics of fuel-lean (equivalence ratio φ = 0.5) premixed hydrogen/air atmospheric pressure flames are investigated in open cylindrical tubes with diameters of d = 1.0 and 1.5 mm using three-dimensional numerical simulations with detailed chemistry and transport. In both cases, the inflow velocity is varied over the range where the flames can be stabilized inside the computational domain.

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  • Numerical Investigation of Three-Dimensional

    2009-2-4 · One and a half stages of a low pressure turbine were investigated using a three-dimensional, time-accurate, viscous solver. Unsteady analyses were carried out by varying the circumferential relative position of consecutive vanes to study the effects of clocking on performance.

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  • Three Dimensional Mixer - Industrial Mixer

    Three-Dimensional Calculation of Air-Water Two-Phase Flow in a Centrifugal Pump Based on a Bubbly Flow Model with Fixed Cavity. Minemura, Kiyoshi Uchiyama, Tomomi

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  • Three-Dimensional Calculation of Air-Water Two

    A three-dimensional (3D) non-reflecting boundary condition for linearized flow solvers is presented. The unsteady aerodynamic modes at the inlet and outlet (far-field) are numerically determined by solving an eigen problem for the semi-discretized flow equations on a two-dimensional mesh.

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  • Three-Dimensional Non-Reflecting Boundary

    2021-4-29 · Author summary It has been known for over 50 years that EBV infection is associated with NPC. Despite many advances from studies in 2-dimensional cell culture, many aspects of EBV molecular pathogenesis in the nasopharynx remain undefined because the cell types and the biology of the nasopharyngeal epithelium can only be faithfully captured in 3-dimensional cell culture.

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  • A primary nasopharyngeal three-dimensional air

    The unsteady performance of air turbines with partial admission not only influences the aerodynamic performance and thermodynamic efficiency of turbine but also generates strong excitation force on blades to impair the turbine safely operating. Based on three-dimensional viscous compressible Navier-stokes equations, the present study employs ...

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  • Computational Fluid Dynamics Modeling Three

    Unsteady flow of a single six-blade ruston turbine in stirred tank is numerically simulated by using the large eddy simulation. Then the effect of the turbine installation position on mixing flow field is studied. The result shows that with a relatively low paddle installation position, mixing effect at the bottom of tank is obvious, while which go against the materials at the top layer mixing.

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  • Numerical Simulation of Three Dimensional Unsteady

    Weigand, B, & Harasgama, SP. 'Computations of a Film Cooled Turbine Rotor Blade With Non-Uniform Inlet Temperature Distribution Using a Three-Dimensional Viscous Procedure.' Proceedings of the ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration. The ...

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