|Table of Contents|

Effect of different engine/diffuser installation schemes on start-up process in high attitude test(PDF)

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

Issue:
2022年01期
Page:
53-60
Research Field:
研究与设计
Publishing date:

Info

Title:
Effect of different engine/diffuser installation schemes on start-up process in high attitude test
Author(s):
YANG Jianwen; HU Jinhua; SHI Xiaobo
(Science and Technology on Liquid Rocket Engine Laboratory,Xi’an Aerospace Propulsion Institute,Xi’an 710100,China)
Keywords:
upper-stage engine;  start-up process;  nozzle ablation;  high-altitude simulation test
PACS:
V435
DOI:
-
Abstract:
During the high-attitude simulation test of an upper-stage engine,oxidation and ablation occurred somewhere on the outer wall of nozzle expansion section. Aiming at this problem,a numerical simulation on the start-up process of the high-altitude test was carried out. The results show that the flow field in the nozzle and the diffuser has reached a stable state within 0.1 s under the test state and two improved schemes,and the flow field parameters,such as Mach number and static pressure,do not change with time. During the start-up process of the engine,the high-temperature gas at the nozzle outlet will flow back into the vacuum chamber. The experimental scheme has the most gas backflow while the improved scheme I has the least gas backflow,and the improved scheme II has a gas backflow between the experimental scheme and the improved scheme I. By the comprehensive comparison,it is considered that the improved scheme I is the best,which is an effective measure to prevent gas backflow from ablating the outer wall of nozzle during the engine start-up process in high-attitude test.

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