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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2011003265
pages 389-401

LOCAL HEAT TRANSFER OF JET IMPINGEMENT COOLING WITH FILM EXTRACTION FLOW IN A ROTATING CAVITY

Kai Wang
Key Laboratory of Molecular Virology & Immunology, Institut Pasteur of Shanghai, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200025, China
Guoqiang Xu
National Key Laboratory of Science and Technology on Aero-Engines, School of Jet Propulsion, Beihang University, Beijing, 100191, China; School of Energy Science and Engineering, Harbin institute of Technology, Harbin, 150001, China
Zhi Tao
National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics The Collaborative Innovation Center for Advanced Aero-Engine of China Beihang University Beijing 100191, China
Jining Sun
National Key Laboratory of Science and Technology on Aero-Engines, School of Jet Propulsion, Beihang University, Beijing, 100191, China
Hongwu Deng
National Key Laboratory of Science and Technology on Aero-Engines, School of Jet Propulsion, Beihang University, Beijing, 100191, China

RÉSUMÉ

An experimental investigation was carried out to examine the heat transfer characteristics on impingement cooling with extraction flow in a rotating cavity. Two H/d configurations of 3.0 and 6.0 were conducted. The Reynolds number based on the inlet velocity of the jet air and the diameter of the impingement hole was fixed at 2000. The test model rotated at five different speeds, 0, 200, 400, 600, and 800 rpm, in two reversal directions, respectively. The local heat transfer coefficient on the target surface was measured by a transient method with thermochromic liquid crystal. Experimental result reveals that the jet flow could be bent by the Coriolis force and consequently the heat transfer would be weakened by rotation. The heat transfer coefficient of H/d = 3 configuration is higher than that of H/d = 6 configuration for either stationary or rotational conditions. For the structure of H/d = 6.0, the stagnation point has an offset of 1.5d due to the bending of the jet flow. Compared to the stationary results, the maximum of the local heat transfer coefficient is reduced by 38.3% and the averaged heat transfer coefficient is reduced by 44.5% at 800 rpm. For the structure of H/d = 3.0, the offset of the stagnation point is small, but the spreading rate of the jet core is enhanced by rotation. Although not as strongly as the structure of H/d = 6.0, the heat transfer is still weakened by rotation. The maximum of local heat transfer coefficient is decreased 29.2% and average heat transfer coefficient is decreased 27.8% at 800 rpm compared to those at 0 rpm.


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