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Experimental Comparison of Efficiency of Initial Shock Wave Attenuator(PDF)

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2001年04期
Page:
364-368
Research Field:
Publishing date:

Info

Title:
Experimental Comparison of Efficiency of Initial Shock Wave Attenuator
Author(s):
XuQiang ZhangFuxiang ① LiaoGuanxuan
State Key Lab of Fire Science, University of Science and Technology of China, Hefei230026)
Keywords:
engine tests shock wave attenuat ion f low fields ex hausted flow f ield w avelet analysis
PACS:
TJ760.6
DOI:
-
Abstract:
Init ial shock wave ( ISW) generated by engine ex hausted flow f ield has harmful effect on launch equipment so measures should be taken to attenuate this ef fect. As one of these measures a perforated attenuator was int roduced to repress ISW. Experiment w as conducted to compare the eff iciency of ISW at tenuators with dif ferent perforation rat io. Ex perimental engine w as used in the study. Pressure of ISW on rigid arc w as measured w ith piezo- resistance pressure transducers. Pressure data w ere analyzed by w avelet transform in w avelet domain. Frequency band energy spect rum and intensity index of ISW based on wavelet coef ficient were obtained. Peak pressure attenuat ion eff iciency and intensity index attenuation eff iciency w ere def ined to evaluate the funct ion of attenuator. Result show s that the attenuator is quite perfect to repress ISW, and lower perforat ion rat io has better at tenuation function in near f ield for rocket eng ine.

References:

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3 胡昌华, 张军波, 夏军等. 基于MATLAB 的系统分析与设计——小波分析. 西安: 西安电子科技大学出版社, 19991 7~ 8

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Last Update: 2013-03-25