进气管路对固冲试验推力测量的影响

摘要

The influence of pipeline structures and gas parameters varying such as temperature,pressure, velocity etc. on test bench thrust value was studied for ramjet directed-connecting ground testing under simulative flight condition. Thrust transmission characteristics were discussed under general Hooke's law connotation based on the dynamics model of thrust measurement system. The design principle and methods of pipes with bellow is analyzed. The stress, strain,displacement, modal of bellow are calculated by adopting finite element method considering gas parameters and bellow length varying. According to analysis conclusion and research experience,the key laws which affect thrust measurement are offered. Test results verified the correctness of analysis.%研究模拟冲压进气条件下,进气管路结构以及温度、压力、速度等进气参数变化对冲压发动机地面直连试验推力测量的影响,基于系统动力学模型在广义胡克定律意义下探讨了系统传输特性.论述了含波纹管进气接管的设计原理、方法,考虑温度、压力载荷及长度等参数变化的不同工况,利用有限元方法对波纹管进行了应力、应变、位移等计算和模态分析.依据结果分析和科研经验,给出了进气管路及进气参数变化对推力测量影响的主要作用规律,多次试验结果验证了分析的正确性.