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Gas composition analysis of helium-xenon Brayton cycle based on operating status (PDF)

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

Issue:
2023年03期
Page:
76-82
Research Field:
目次
Publishing date:

Info

Title:
Gas composition analysis of helium-xenon Brayton cycle based on operating status
Author(s):
WANG Haoming1; 2;  CHEN Jinli1; 2;  WANG Yuanding1; 2;  GUO Manli1; 2
(1. Shanghai Institute of Space Propulsion, Shanghai 201112, China; 2. Shanghai Engineering Research Center of Space Engine, Shanghai 201112, China)
Keywords:
Brayton cycle;  helium-xenon mixture;  operating status;  dynamic simulation;  gas composition
PACS:
V476.2
DOI:
-
Abstract:
Gas composition maintenance of helium-xenon mixture is the basis for the long-term stable operation of the helium-xenon brayton energy conversion system. However, composition of the helium-xenon gas in the system may change because of working gas leakage or adjustment of filling amount, and then system operation status is affected. Through the dynamic simulation of the helium-xenon brayton system, the difference of the system operation status was obtained with the condition of the gas composition changing. When the gas composition changes, the common working line of the system will shift, especially when the gas molar mass becomes smaller, the common working line will shift to compressor surge line; and when the full power output is reached, the surge margin of the compressor will be smaller and higher inlet temperature of turbine and recuperator is required, which is not conducive to the stable operation of the system. Based on the system simulation results, this paper proposed a calculation method of helium-xenon gas composition with load rate and flow rate as variables at rated speed and put forward a new idea for monitoring and adjusting the change of working fluid composition in helium-xenon Brayton cycle. In this method, accurate measurement of flow rate is an important guarantee to improve the precision of component analysis.

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