空间闭式布雷顿循环旁路调节特性分析

闭式布雷顿循环是未来空间大功率热电转换的有效途径,而旁路调节是实现系统快速功率调节和转速控制的有效手段.通过对标美国普罗米修斯计划中的热电转换系统参数,进行了涡轮、压气机的气动设计和换热器性能计算,获得了包括组件特性、管道布局的热电转换系统动态仿真模型.基于该动态模型,对旁通阀不同响应时间、开度对系统功率、转速和循环温...

Analysis of bypass regulation characteristics for space closed Brayton cycle system

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 effect 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 space 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 increases in the low-pressure side.The inlet temperature of recuperator hot side increases,but the inlet temperature of cold side decreases,and the thermal stress of recuperator further increases.The sensibility for bypass regulation can be reduced by improving system volume inertia.