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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 12    December 2016

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Analysis of chamber effect on intermittent pulsation
Tang Chan(唐婵)1, 2, Zhang Jing-zhou(张靖周)1, 3, Tan Xiao-ming(谭晓茗)1, WANG Chun-hua(王春华)1

1. College of Energy and Power Engineering, Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
3. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China

Abstract:A numerical study was conducted to seek an optimized dimension of jet chamber in the pulsating impinging flow. The flow and heat transfer effect of the pulsation flow through a jet chamber was investigated. The numerical results indicate that heat transfer effective enhances near the stagnation region for the intermittent pulsed flow with jet chamber compared to that without jet chamber. Simulations of the flow through a jet chamber show that the heat transfer rate on the impingement surface is highly dependent on the velocity at the position which is really close to target surface. Examination of the velocity field suggests that the velocity exists a maximum value as the axis distance increases. In addition, the velocity at the jet hole is enlarged by the jet chamber due to the entrainment effect, and the velocity is amplified even greater as the size of the jet chamber becomes bigger. Nevertheless, the velocity declines quickly while the flow axis distance is more than a certain range, leading to poor heat transfer. Thus, intermittent pulsed flow with jet chamber is suggested as a method of improving heat transfer by employing larger dimensions of jet chamber for appropriate jet-to-surface spacing.

 

Key words: pulsed impinging jet; intermittent pulsation; jet chamber; Nusselt number

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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