|Table of Contents|

Analysis of bypass regulation characteristics for spaceclosed Brayton cycle system(PDF)

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

Issue:
2021年02期
Page:
61-67
Research Field:
研究与设计
Publishing date:

Info

Title:
Analysis of bypass regulation characteristics for spaceclosed Brayton cycle system
Author(s):
WANG Haoming1; 2; XUE Xiang1; 2;  ZHANG Yinyong1; 2; LIN Qinguo1; 2
1Shanghai Institute of Space Propulsion, Shanghai 201112, China; 2Shanghai Engineering Research Center of Space Engine, Shanghai 201112, China
Keywords:
closed Brayton cycle;  dynamic simulation;  bypass regulation;  valve opening;  response time
PACS:
V476.2
DOI:
-
Abstract:
Closed Brayton cycle is an effective way of high-power thermo-electrical conversion in the future space mission, and the bypass adjustment is an effective way to realize fast power regulation and rotating speed control. Through the cycle parameters of thermo-electrical conversion system in Prometheus Project of US, the aerodynamic designs of turbine and compressor were finished as well as the performance of heat exchangers. Then, a dynamic simulation model was obtained based on the components characteristics and pipeline layout. Based on this dynamic model, the effort of different response time and opening degree of the bypass valve on the system power output, rotating speed, cycle temperature, pressure and other system parameters were simulated The results show that the power output and rotating speed of the closed apace Brayton cycle system decrease rapidly after the bypass valve opening, especially the power overshoot occurs in the process. The pressure in the high-pressure side decreases and it decreases in the low-pressure side. The inlet temperature of recuperator hot side increases, but the inlet temperature of cold side decrease, and the thermal stress of recuperator further increases. The sensibility for bypass regulation can be reduced by improving system volume inertia.

References:

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