| AXIAL HOLE AIR-ENTRAINING COOLING TECHNIQUE OF
RADIAL-FLOW TURBINES |
| Chao Ma 1,2, Jianjian Zhang 2,3, Ningning Wang 2,3, Zhifu Zhu 2,4 |
1School of Mechanical and Automation, Weifang University
2Key Laboratory of Internal Combustion Engine Turbocharging System, China Machinery Industry Federation
3Kangyue Technology (Shandong) Co., Ltd.
4School of Physical Sciences, Qingdao University |
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| ABSTRACT |
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In response to the continually increasing thermal load caused by the rising gas temperature in the inlet of
radial-flow turbines, this paper proposes the use of axial hole air-entraining cooling to cool the turbine shaft and turbo wheel
back-disc. The cooling effect of this technique, as well as its influence on the aerodynamic performance of turbines, were
investigated through numerical simulations. The results demonstrate that the axial hole air-entraining cooling technique can
significantly improve the local cooling efficiency of the turbine back-disc. Under a blowing ratio of 0.25 %, the local cooling
efficiency increased by 154 %, and the temperature decreased by up to 233 K. The maximum temperature on the surface of
the turbine shaft at the floating bearing location decreased significantly, thus reducing the coking risk of the lubricating oil.
When the blowing ratio was within 0.5 %, the impact of this cooling technique on the overall turbine performance was
negligible. |
| Key Words:
Turbocharger, Radial turbine, Cooling efficiency, Conjugate heat transfer |
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Corresponding Author.
Zhifu Zhu , Email. 
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