|Table of Contents|

Numerical analysis of the performance of the diffuser for rocket engine and the gas jet after the diffuser(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2021年05期
Page:
71-77
Research Field:
研究与设计
Publishing date:

Info

Title:
Numerical analysis of the performance of the diffuser for rocket engine and the gas jet after the diffuser
Author(s):
HE Hong; DING Jiawei; LENG Haifeng; YU Fanchao; ZHANG Yuhao
(Xian Aerospace Propulsion Test Technology Institute,Xian 710100,China)
Keywords:
performance of diffuser gas jet numerical study environmental design
PACS:
V414.1
DOI:
-
Abstract:
The diffuser is an important ground equipment for high altitude simulation test of rocket engines. The design parameters of an air-bleed cylinder diffuser were studied numerically,and the gas jet after the diffuser was analyzed. The results show that the diffuser diameter is an important parameter affecting the diffuser performance. When the diffuser diameter increases,the total pressure loss increases and the intensity of shock wave in the diffuser increases. The length-diameter ratio is not an independent parameter affecting the diffuser flow field and start-up. The selection of the parameters is related to the engine working condition and structure condition,and the selection of the leakage gap can be designed according to the engine working condition. The calculation of the gas jet after the diffuser shows that,compared with the nozzle gas jet without the diffuser,the gas jet after the diffuser has the characteristics of large area because the total pressure loss of the gas in the diffuser is smaller than that of the free jet. It provides a reference for the environmental design caused by gas jet during the test.

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