Calculation of Fluid Flow Field and Thermal Field for Air-to-Air Cooled Medium Motor

2014 ◽  
Vol 543-547 ◽  
pp. 362-365
Author(s):  
Tian Hu ◽  
Yan Li ◽  
Ren Yuan Tang
Keyword(s):  
Flow Field ◽  
Thermal Field ◽  
Cooling System ◽  
Three Dimensional ◽  
Cooling Effect ◽  
Computational Fluid Mechanics ◽  
Computational Domain ◽  
Motor Cooling ◽  
Volume Method ◽  
Cooling Air

For an air-to-air cooled medium motor, to ensure the cooling effect of the motor, the physical model of the motor cooling air inside the cooler was built. By the finite volume method according to the computational fluid mechanics (CFD) principle, the three-dimensional turbulent flow field in computational domain was simulated numerically using boundary conditions of the inlet and outlet obtained from engineering calculations. From the result, the thermal field of cooler was calculation. Finally, through the comparison, the cooler cooling the motor cooling effect sufficient play , the outer duct can effectively reduce the internal temperature of the cooling gas duct , the air duct outside the cooling gas declined about 35 °C after cooling the temperature of the air duct, the calculation method is feasible for the motor cooling system design overall foundation .

Calculation of 3D Fluid Flow Field and Thermal Field of Air-Cooled Medium Motor

2014 ◽  
Vol 513-517 ◽  
pp. 3468-3471
Author(s):  
Tian Hu ◽  
Yan Li ◽  
Ren Yuan Tang
Keyword(s):  
Flow Field ◽  
Thermal Field ◽  
Asynchronous Motor ◽  
Flow Distribution ◽  
Internal Flow ◽  
Middle Part ◽  
Maximum Temperature ◽  
Computational Fluid Mechanics ◽  
Computational Domain ◽  
Cooling Air

For a medium air-cooled asynchronous motor, the physical model of cooling air inside the motor was established to research the air flow distribution and characteristics of the internal flow of the medium motor. By the finite volume method according to the computational fluid mechanics (CFD) principle, the three-dimensional turbulent flow field in computational domain was simulated numerically using boundary conditions of the pressure inlet and outlet obtained from engineering calculations. From the result, the thermal field of stator and rotor was calculation. The results show that the wind speed of cooling air duct which near the both ends was higher than the middle. It causes the temperature of the motor which near the both ends was lower than the middle part. The maximum temperature rise of the motor appear in the middle of the upper windings, and the specific value was 74K.

An Analysis Method for Multistage Transonic Turbines With Coolant Mass Flow Addition

1998 ◽  
Vol 120 (4) ◽  
pp. 744-752 ◽  
Author(s):  
F. Mildner ◽  
H. E. Gallus
Keyword(s):  
Flow Field ◽  
Mass Flow ◽  
Three Dimensional ◽  
Iterative Solution ◽  
Curvilinear Coordinates ◽  
Main Stream ◽  
Viscous Effects ◽  
Air Mixing ◽  
Volume Method ◽  
Cooling Air

The subject of this paper is a numerical method for the calculation of the transonic flow field of multistage turbines, taking high coolant flow into account. To reduce the processing time, a throughflow method based on the principels of Wu is used for the hub-to-tip calculation. The flow field is obtained by an iterative solution between a three-dimensional inviscid hyperbolic time-dependent algorithm with an implicit finite volume method for the blade-to-blade calculations using C-meshes and a single representative meridional S2m-streamsurface. Along the S2m-plane with respect to nonorthogonal curvilinear coordinates, the stream function equation governing fluid flow is established. The cooling air inflow inside the blade passage forbids the assumption of a constant mass flow along the main stream direction. To consider the change of the aerodynamic and thermodynamic behavior, a cooling air model was developed and implemented in the algorithm, which allows the mixing of radially arbitrarily distributed cooling air in the trailing edge section of each blade row. The viscous effects and the influence of cooling air mixing are considered by the use of selected loss correlations for profile, tip leakage, secondary flow and mixing losses in the S2m-plane in terms of entropy. The method is applied to the four-stage high-temperature gas turbine Siemens KWU V84.3. The numerical results obtained are in good agreement with the experimental data.

Thermodynamic Analysis of Flow Field at the End of Combustor Simulator

2012 ◽  
Vol 225 ◽  
pp. 261-266 ◽  
Author(s):  
Kianpour Ehsan ◽  
Nor Azwadi Che Sidik ◽  
Mohsen Agha Seyyed Mirza Bozorg
Keyword(s):  
Flow Field ◽  
Penetration Depth ◽  
Thermodynamic Analysis ◽  
Film Cooling ◽  
Thermal Field ◽  
Three Dimensional ◽  
Leading Edge ◽  
Aero Engine ◽  
Three Dimensional Presentation

This study was carried out to investigate the effects of different cooling holes configurations on the thermal field characteristics inside a combustor simulator. In this research, a three-dimensional presentation of a true Pratt and Whitney aero-engine was simulated and analyzed. This combustor simulator combined the interaction of two rows of dilution jets, which were staggered in the stream wise direction and aligned in the span wise direction. The findings of the study indicate that the thickness of the film-cooling layer was thicker for the greater penetration depth. Furthermore, for the combustor simulator with more cooling holes, the temperature near the wall and between the jets was slightly increased. Also at the leading edge of the jet, the gradients of temperature were quite high at the jet-mainstream interface.

Time Accurate Euler Simulation of Interaction of Nozzle Wake and Secondary Flow With Rotor Blade in an Axial Turbine Stage Using Nonreflecting Boundary Conditions

1995 ◽  
Author(s):  
S. Fan ◽  
B. Lakshminarayana
Keyword(s):  
Flow Field ◽  
Boundary Conditions ◽  
Unsteady Flow ◽  
Secondary Flow ◽  
Rotor Blade ◽  
Three Dimensional ◽  
Computational Domain ◽  
Turbine Stage ◽  
Axial Turbine ◽  
Unsteady Pressure

The objective of this paper is to investigate the three dimensional unsteady flow interactions in a turbomachine stage. A three-dimensional time accurate Euler code has been developed using an explicit four-stage Runge-Kutta scheme. Three-dimensional unsteady non-reflecting boundary conditions are formulated at the inlet and at the outlet of the computational domain to remove the spurious numerical reflections. The three-dimensional code is first validated for 2-D and 3-D cascades with harmonic vortical inlet distortions. The effectiveness of non reflecting boundary conditions is demonstrated. The unsteady Euler solver is then used to simulate the propagation of nozzle wake and secondary flow through rotor and the resulting unsteady pressure field in an axial turbine stage. The three dimensional and time dependent propagation of nozzle wakes in the rotor blade row and the effects of nozzle secondary flow on the rotor unsteady surface pressure and passage flow field are studied. It was found that the unsteady flow field in the rotor is highly three-dimensional and the nozzle secondary flow has significant contribution to the unsteady pressure on the blade surfaces. Even though the steady flow at the midspan is nearly two-dimensional, the unsteady flow is 3-D and the unsteady pressure distribution can not by predicted by a 2-D analysis.

Numerical Simulation of Viscous Flow-Field in Cascade Using Thin-Layer Equations and AF Method

1999 ◽  
Author(s):  
Yumin Xiao ◽  
R. S. Amano
Keyword(s):  
Flow Field ◽  
Boundary Conditions ◽  
Viscous Flow ◽  
Secondary Flow ◽  
Three Dimensional ◽  
Factorization Method ◽  
Computational Domain ◽  
Approximate Factorization ◽  
Calculation Results ◽  
Transonic Cascade

Abstract In this paper an implicit 3-D solver for computations of a viscous flow has been developed and the computations of the flow between blade passage are presented. This method employs an AF (Approximate Factorization) method in which four techniques are incorporated to speed up convergence to the steady-state solutions: (1) body-fitted H-grid; (2) artificial viscosity; (3) implicit residual smoothing; and (4) local time-stepping. The two-dimensional pseudo-characteristic method was used to determine the inlet and outlet boundary conditions of the computational domain and the periodic boundary conditions were used at inter-boards. The validation cases include subsonic and transonic viscous flows in C3X cascade. Results for these turbine cascade flows are presented and compared with experiments at corresponding conditions. Computed pressure distributions on blade surfaces show good agreement with the published experimental data. This method was further applied to a three-dimensional case and demonstrated the code capability for predicting the secondary flow in a 3-D transonic flow-field. From these computations it was found that the proposed method possesses superior convergence characteristics and can be extended to unsteady flow calculations. Finally, it was observed that the three-dimensional calculation results show that the secondary flow mechanism in a transonic cascade seems to be quit different from those, in a subsonic case.

Three-Dimensional Study of Heat and Mass Transfer in a Partially Porous Elongated Cavity

2010 ◽  
Vol 297-301 ◽  
pp. 728-732
Author(s):  
N. Mimouni ◽  
Salahs Chikh ◽  
Rachid Bennacer
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Cooling System ◽  
Mass Transfer Rate ◽  
Vertical Wall ◽  
Three Dimensional ◽  
Simple Algorithm ◽  
Geometrical Parameters ◽  
Computational Domain ◽  
Adsorption Cooling System

A 3D numerical analysis is carried out to investigate heat and mass transfer in a partly porous cavity of high aspect ratio. The goal is to determine the best physical and geometrical parameters that allow optimal heat and mass transfer rate in such domain used in a solar adsorption cooling system. The computational domain consists of a tall cavity heated on the left vertical wall and cooled on the opposing wall. The SIMPLE algorithm is used to handle the velocity pressure coupling. Simulation results allow determining the optimal configuration of the used porous substrate and plain fluid position in the cavity in order to optimize the performance of such solar adsorption cooling installation.

Stator Temperature Distribution of AC Machine Based on Fluid Flow Field

2013 ◽  
Vol 313-314 ◽  
pp. 27-30
Author(s):  
Cong Hui Huang ◽  
Xin Zhen Wu
Keyword(s):  
Fluid Flow ◽  
Flow Field ◽  
Cooling System ◽  
Three Dimensional ◽  
Temperature Fields ◽  
Transfer Coefficients ◽  
Safe Operation ◽  
Heat Transfer Coefficients ◽  
Fluid Field ◽  
Ventilation Ducts

In order to study the impacts of the stator ventilation structure on the thermal performance, the fluid flow model of the stator radial ventilation ducts is established. The fluid flow fields are calculated and analyzed, from which the three-dimensional fluid field distribution inside the radial ventilation ducts is shown. Subsequently, the heat transfer coefficients are obtained on the basis of calculated results of the fluid flow field, and the stator three-dimensional temperature fields are solved. The numerical results are compared among different inlet velocities at the entrance of the radial ventilation ducts, which provides a theory basis for the design of the cooling system and improves the safe operation level of the generator.

Research of Flow Field for Irradiation Box of Cable Ultraviolet Cross-Linking

2013 ◽  
Vol 274 ◽  
pp. 208-211
Author(s):  
Jia Dong Tang ◽  
Yi Ping Lu ◽  
Jia De Han ◽  
Zuo Min Wang
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Transfer Effect ◽  
Cross Linking ◽  
Solid Model ◽  
Distribution Characteristics ◽  
Air Velocity ◽  
Large Space ◽  
Cooling Air ◽  
Ventilation Scheme

In order to analyze the cooling air velocity and pressure distribution characteristics in a ventilation scheme presented for the irradiation box of cable ultraviolet cross-linking, the three-dimensional solid model of the irradiation box was established, its flow field was simulated by software FLUENT according to computational fluid dynamics principle under some calculation conditions. The results show that the air velocity around the cable is higher, enhancing convective heat transfer effect, the irradiation box large space is under negative pressure condition.

Effect of slot end faces on the three-dimensional airflow field from the melt-blowing die

2020 ◽  
Vol 40 (7) ◽  
pp. 607-613
Author(s):  
Yudong Wang ◽  
Jianping Zhou
Keyword(s):  
Numerical Calculation ◽  
Flow Field ◽  
Field Distribution ◽  
Three Dimensional ◽  
Central Area ◽  
Computational Domain ◽  
Melt Blowing ◽  
Slot Die ◽  
Calculation Results ◽  
Airflow Field

AbstractIn order to investigate the effect of the slot ends of the melt-blowing die on the three-dimensional airflow field distribution and the fiber draft, the numerical calculation was carried out. The computational domain of the slot die was established with Gambit, and the flow field was calculated using FLUENT. Compared with the experimental data collected by a hot-wire anemometer, the numerical calculation results are credible. The results show that the slot end face has a certain influence on the three-dimensional flow field distribution under the melt-blowing die. The air velocity and temperature in the center region are quite different from those near the slot-end face. As the distance from the center of the flow field increases, the velocity and temperature on the spinning line begin to decrease. The velocity and temperature distributions of the spinning lines in the central area and nearby areas are almost the same; the temperature and velocity values on the spinning lines near the slot end are the lowest. The distribution characteristics of the three-dimensional airflow field could affect the uniformity of the fiber diameter and the meltblowing products.

scholarly journals Numerical investigation of heat transfer in a garment convective cooling system

2022 ◽  
Vol 9 (1) ◽  
Author(s):  
Yijie Zhang ◽  
Juhong Jia ◽  
Ziyi Guo
Keyword(s):  
Heat Transfer ◽  
Thermal Comfort ◽  
Cooling System ◽  
Three Dimensional ◽  
Skin Surface ◽  
Air Gap ◽  
The Body ◽  
Three Dimensional Model ◽  
Cooling Air ◽  
Eddy Flow

AbstractA personal microclimate management system is designed to maintain thermal comfort which allows people to overcome a harsh environment. It consists of several micro-fans placed in the garment side seam to provide cooling air. The computational fluid dynamics method was used to simulate the three-dimensional model and analysis the influence of fan’s number and air gap distance. The obtained results depict that the introduced cool airflow will find its way along paths with flow resistance minimized and exhaust through several separated exit. The body heat flux is taken away at the same time. The convection effect is enhanced by the increase in the fans’ numbers, but the fans’ cooling effect varies a lot because of various air gap distances. When the air gap is small enough, the cooling air impact the body surface directly and causes fierce heat loss. While the air gap distance is large enough, the heat transfer along the skin surface could be enhanced by the eddy flow which is existed in the air gap between body and garment. These phenomena can maintain the body’s thermal comfort in a suitable range.

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