URANS Modeling of Effects of Rotation on Flow Distribution and Heat Transfer in an Electric Motor

2021 ◽  
Author(s):  
ANKIT TIWARI ◽  
Savas Yavuzkurt
Keyword(s):  
Heat Transfer ◽  
Electric Motor ◽  
Flow Distribution ◽  
Effects Of Rotation

scholarly journals Internal Aerodynamics and Heat Transfer Problems Associated to Film Cooling of Gas Turbines

1979 ◽  
Author(s):  
Emile Le Grivès ◽  
J.-J. Nicolas ◽  
Jeanne Génot
Keyword(s):  
Heat Transfer ◽  
Film Cooling ◽  
Gas Turbines ◽  
Flow Distribution ◽  
Transfer Coefficients ◽  
Pressure Losses ◽  
Effects Of Rotation ◽  
Transient Thermal ◽  
Turbine Airfoils ◽  
Transfer Problems

Heat transfer and aerodynamic processes within coolant ducts and film emission holes of high temperature gas turbine components have been investigated at ONERA by means of specially devised test rigs affording an adequate similitude of geometrical or aerothermal parameters. Results obtained in tests at steady or transient thermal regime are reported for several points of interest concerning internal coolant circuits: • Heat transfer through multihole parts of turbine airfoils • Aerodynamics of flows within perforated ducts, with special attention to coolant mass flow distribution, to pressure losses and heat transfer coefficients in small or scaled up turbine blade models • Heat transfer over a perforated wall, with mass transfer of the coolant flow through holes of various patterns and pitch-to-diameter ratio. Experimental data are discussed in regard to desired accuracy for the analysis of heat transfer in air-cooled gas turbines, except for the effects of rotation.

URANS Modeling of Effects of Rotation on Flow Distribution and Heat Transfer in an Electric Motor

2020 ◽  
Author(s):  
Ankit Tiwari ◽  
Savas Yavuzkurt
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Mass Flow ◽  
Thermal Performance ◽  
Flow Distribution ◽  
Static Condition ◽  
Heat Transfer Analysis ◽  
Relative Distribution ◽  
Sliding Mesh ◽  
Effects Of Rotation

Abstract Traction motors are electric motors used in vehicle propulsion. In this study, an externally cooled 3-phase AC induction motor which has cooling tubes drilled axially throughout the length of the rotor and stator, is analyzed for thermal performance. The cooling air is supplied by a centrifugal blower connected to the inlet plenum of the motor. Unlike in static condition, the relative distribution of air in the rotor and the stator tubes is not uniform and varies due to the rotation of rotor. It has been shown in previous studies that due to rotor’s rotation, the resistance of the flow path through the rotor tubes increases compared to the static condition. This results in reduction of flow through the rotor tubes. Generally, the steady state MRF (Multiple Reference Frame) approach is used to model the rotational effect. While this approach works in the initial design phase, Unsteady sliding mesh approach is suggested for design validation. It was found that at 3000 RPM, the mass flow rate in the rotor predicted by the Sliding mesh model could be as much as 16% lower than that predicted by the MRF model. To assess its impact on thermal performance, steady state conjugate heat transfer analysis was performed. It was found that the rotor temperatures could be up to 8.6-degree C higher based on the mass flow predictions by sliding mesh approach compared to the MRF approach.

Effects of Rotation on Blade Surface Heat Transfer: An Experimental Investigation

1997 ◽  
Author(s):  
Roger W. Moss ◽  
Roger W. Ainsworth ◽  
Tom Garside
Keyword(s):  
Thin Film ◽  
Heat Transfer ◽  
Experimental Investigation ◽  
Turbine Blade ◽  
Time History ◽  
Surface Heat ◽  
Blade Surface ◽  
Surface Heat Transfer ◽  
Effects Of Rotation ◽  
Wake Passing

Measurements of turbine blade surface heat transfer in a transient rotor facility are compared with predictions and equivalent cascade data. The rotating measurements involved both forwards and reverse rotation (wake free) experiments. The use of thin-film gauges in the Oxford Rotor Facility provides both time-mean heat transfer levels and the unsteady time history. The time-mean level is not significantly affected by turbulence in the wake; this contrasts with the cascade response to freestream turbulence and simulated wake passing. Heat transfer predictions show the extent to which such phenomena are successfully modelled by a time-steady code. The accurate prediction of transition is seen to be crucial if useful predictions are to be obtained.

Numerical Modeling of Velocity and Temperature Distributions in a Bipolar Plate of PEM Electrolysis Cell With Greatly Improved Flow Uniformity

2009 ◽  
Author(s):  
Jephanya Kasukurthi ◽  
K. M. Veepuri ◽  
Jianhu Nie ◽  
Yitung Chen
Keyword(s):  
Heat Transfer ◽  
Proton Exchange Membrane ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Bipolar Plate ◽  
Proton Exchange ◽  
Electrolysis Cell ◽  
Flow And Heat Transfer ◽  
Temperature Distributions ◽  
Pem Electrolysis

In this present work, finite volume method was used to simulate the three-dimensional water flow and heat transfer in a flow field plate of the proton exchange membrane (PEM) electrolysis cell. The standard k-ε model together with standard wall function method was used to model three-dimensional fluid flow and heat transfer. First, numerical simulations were performed for a basic bipolar plate and it was found that the flow distribution inside the channels in not uniform. The design of the basic bipolar plate has been changed to a new model, which is featured with multiple inlets and multiple outlets. Numerical results show that the flow and temperature distributions for the new design become much homogeneous.

Heat Transfer Between Concentric Rotating Cylinders

1959 ◽  
Vol 81 (3) ◽  
pp. 175-183 ◽  
Author(s):  
I. S. Bjorklund ◽  
W. M. Kays
Keyword(s):  
Heat Transfer ◽  
Vortex Motion ◽  
Rotating Cylinders ◽  
Number Range ◽  
Experimental Heat ◽  
Flow And Heat Transfer ◽  
Controlling Mechanism ◽  
Experimental Heat Transfer ◽  
Effects Of Rotation ◽  
Heat And Momentum Transfer

In this paper the problem of convective heat transfer between concentric rotating cylinders is studied. Experimental heat-transfer data are presented for four different values of clearance between the cylinders and for several combinations of outer to inner cylinder speed. The heat-transfer performance indicates three regimes of flow; the first at low peripheral velocities, in which laminar flow and heat transfer by conduction prevail, the second at cylinder speeds above a theoretically predictable value, in which vortex flow occurs and is the controlling mechanism, and a third at still higher speeds, in which a distorted type of vortex motion may be present. The data for the case of the inner cylinder only rotating can be correlated by the equation NNu/NNucond=0.175NTa12 for the Taylor number range 90 to 2000. A heat-and-momentum-transfer-analogy solution for this case follows the trend of the data, but gives results which are somewhat high. The combined effects of rotation of both cylinders may be correlated by the empirical equation NNuNNucond=1.1NTa-NTacrη-NTacr01-3.5d/R141.1+NTacrη-NTacr03.5d/R112 for values of the abscissa from about 2 to 50.

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