|Table of Contents|

Investigation for working adaptability of floating ring seals in deep throttling engines(PDF)

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

Issue:
2017年05期
Page:
28-33
Research Field:
研究与设计
Publishing date:

Info

Title:
Investigation for working adaptability of floating ring seals in deep throttling engines
Author(s):
SHEN Wenjin; YE Xiaoqiang
Beijing Aerospace Propulsion Institute,Beijing 100076,China
Keywords:
deep throttling;  oxygen turbopump;  floating ring seal;  variable thrust adaptability
PACS:
V434.2-34
DOI:
-
Abstract:
According to the demands of the manned space program,the project of the LOX/CH4 engine key techniques needs to be studied for the multi-startup and 10%～100% deep throttling capability,whose thrust is 80 kN.The variable thrust adaptability of the floating ring seals in the engine would affect safety and reliability of the oxygen turbopump assembly as one of the core components in rocket engines.In this paper,according to variable thrust requirements of the engine system,the floating force of the floating ring seals under the conditions of different thrust and eccentricity ratio is calculated with the numerical method,which is compared with drag force calculated with one-dimensional formula.Based on the above measures,the eccentricity ratio(0.4～0.6)of the first and second floating ring seals working at full work conditions,and the leakage rate of 2.58～39.4 g/s are determined.Working within the range of this eccentricity ratio,the floating ring seals has high reliability and capability of working in changing conditions with a wide range,the rubbing or breaking of its edge can be avoided,which can satisfy safety requirements of the turbopump and deep throttling requirements of the engine.The results could provide a theoretical foundation for turbopump project approach and design.

References:

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Memo

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Last Update: 2017-11-10