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Influences of Back-Pressure Change Rate on Channels with Strut(PDF)

《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

Issue:
2020 01
Page:
1-9
Research Field:
Publishing date:

Info

Title:
Influences of Back-Pressure Change Rate on Channels with Strut
Author(s):
Tian Liang1Liu Hongbao1 2Guo Sainan1Wang Enyu1Duan Runze1
1. College of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China; 2. Weichai Power Co.,Ltd,Weifang 261000,China
Keywords:
scramjethysteresisstrutback-pressuredynamic change
PACS:
V235.21
DOI:
10.11715/rskxjs.R201812002
Abstract:
In order to further understand the mechanism of hysteresis,this paper uses a rectangular cross-section flow channel with a strut to carry out the numerical simulation of dynamic back-pressure characteristics.The influences of back-pressure rate on flow field structure are analyzed,and the corresponding flow hysteresis is captured.The results show that compared with steady flow,the flow field under the dynamic change of backpressure shows obvious hysteresis,and the faster the back-pressure change rate,the stronger the hysteresis will be. Under the fixed back-pressure rising rate,the starting position of pressure rise is in the uniform acceleration state,and the acceleration and the back-pressure changing rate are in a power function relationship.In the stable process after the back-pressure rises to its maximum value,the starting position of pressure rise decelerates upstream until it stops.During the back-pressure drop after reaching the maximum pressure ratio,the starting position of pressure rise will continue to move upstream for a distance.If the starting position of pressure rise moves to the upstream of the leading edge of the strut,the wave train will be formed and stabilized at the leading edge of the strut;if the starting position of pressure rise fails to move to the upstream of the front edge of the strut,the change path still will not coincide with the ascending process,and hysteresis will occur.

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Last Update: 2020-01-17