Numerical Investigation and Experimental Verification of the Fluid Cooling Process of Typical Stator–Rotor Machinery with a Plate-Type Heat Exchanger
Abstract
:1. Introduction
2. Materials and Methods
2.1. Structures of Hydrodynamic Retarder
2.2. Governing Equation
2.3. Thermal Problems and Heat Transfer System
2.4. The Numerical Method
3. Experiment Set and Validation
3.1. Experiment Set
3.2. Model Validation
3.3. Validation for Radiating Circulation Branch
4. Result and Discussion
4.1. Steady-State Heat Flow Analysis
4.1.1. Rotor
4.1.2. Interface Region
4.1.3. Stator
4.2. Effect of Angle of Inlet and Outlet Passages
4.3. Effect of Transient Filling Flow and Speed
5. Conclusions
- The numerical results are in good agreement with the experimental data, with a 0.1–2.5% error after considering the variable density and viscosity with the dynamic heat transfer, which is much lower than that of the traditional constant density and viscosity method, the average error of which is 6.478%. The experiment shows that the heat exchanger will efficiently slow down the increase in the oil temperature in the wheel cavity during the braking process of the hydrodynamic retarder.
- In steady analysis, the distribution of the energy dissipation area and the distribution characteristics of the high-temperature area are consistent. The temperature distribution of the blades and interface regions is not uniform. The surface temperature of the blades far away from the inlet and outlet is higher than that of the blades near the inlet and outlet for the cooling effect of oil input or output, and there is a high-temperature zone at the rotor blade and the stator blade. Considering the working performance and the average temperature wheel cavity in the working process, the case with 90° for the inlet and outlet passage can provide a larger braking torque while obtaining a better heat dissipation effect.
- A transient simulation analysis of the flow field and temperature field of the wheel cavity of the full flow hydrodynamic retarder was carried out, and the law of the influence of the flow rate and the rotational speed on the liquid filling speed and the brake temperature rise during the continuous torque adjustment process was studied. At the same time during the filling process, the average temperature in the stator is always higher than or equal to the average temperature in the rotor, and it can be seen that the greater the filling flow is, the more tortuous are the temperature changes of the rotor and the stator, while the difference between the average temperature of the rotor and stator increased with rotational speed rise
- The ongoing research will focus on the microscopic flow field of the current model and reflect more detailed thermophysical characteristics by means of Particle Image Velocimetry (PIV) to better visualize the heat-flow coupling phenomenon in cavity chambers.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Mesh Part | Node Number | |
---|---|---|
Impeller | Rotor | 606,780 |
Stator | 593,125 | |
Flow field | Rotor | 142,319 |
Stator | 108,139 | |
Inlet part | 84,027 | |
Outlet part | 84,959 |
Rotating Speed | Temperature in Experiment | Torque Error Between Case 1 and Experiment | Torque Error Between Case 2 and Experiment |
---|---|---|---|
800 | 144.9 | −0.21% | −12.12% |
900 | 144.7 | 0.92% | −8.12% |
1000 | 134.3 | −0.76% | −6.25% |
1100 | 141.6 | 0.39% | −5.27% |
Rotating Speed | Calculation Time for Case 1 | Calculation Time for Case 2 |
---|---|---|
800 | 65 min 32 s | 64 min 34 s |
900 | 58 min 03 s | 59 min 12 s |
1000 | 62 min 46 s | 62 min 31 s |
1100 | 61 min 07 s | 60 min 57 s |
Position | Pressure Surface of the Rotor | The Suction Surface of the Rotor | Pressure Surface of the Stator | Suction Surface of the Stator |
---|---|---|---|---|
vorticity (s−1) | 368 | 610.4 | 317.7 | 524.8 |
temperature (°C) | 73.85 | 73.75 | 73.85 | 73.85 |
highest temperature (°C) | 75.75 | 75.85 | 75.65 | 75.85 |
Position | Pressure Surface of the Rotor | Suction Surface of the Rotor | Pressure Surface of the Stator | Suction Surface of the Stator |
---|---|---|---|---|
vorticity (s−1) | 344.5 | 580.7 | 306.8 | 502.2 |
temperature (°C) | 44.25 | 44.05 | 44.25 | 44.25 |
highest temperature (°C) | 45.65 | 45.75 | 45.55 | 45.65 |
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Chen, X.; Wei, W.; Mu, H.; Liu, X.; Wang, Z.; Yan, Q. Numerical Investigation and Experimental Verification of the Fluid Cooling Process of Typical Stator–Rotor Machinery with a Plate-Type Heat Exchanger. Machines 2022, 10, 887. https://doi.org/10.3390/machines10100887
Chen X, Wei W, Mu H, Liu X, Wang Z, Yan Q. Numerical Investigation and Experimental Verification of the Fluid Cooling Process of Typical Stator–Rotor Machinery with a Plate-Type Heat Exchanger. Machines. 2022; 10(10):887. https://doi.org/10.3390/machines10100887
Chicago/Turabian StyleChen, Xiuqi, Wei Wei, Hongbin Mu, Xu Liu, Zhuo Wang, and Qingdong Yan. 2022. "Numerical Investigation and Experimental Verification of the Fluid Cooling Process of Typical Stator–Rotor Machinery with a Plate-Type Heat Exchanger" Machines 10, no. 10: 887. https://doi.org/10.3390/machines10100887