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针对载人航天器在密封舱体发生泄露时总压和氧分压的变化规律,建立了载人航天器舱压控制系统仿真模型,利用该模型分析了舱体容积、漏孔通径对总压和氧分压变化趋势的影响。结果表明,随着漏孔通径的增加或舱体容积的减小,总压和氧分压下降至指标下限所需的时间越来越短。随着漏孔通径的增加,舱体的初始漏气速率越高,但漏气速率下降得也越快。在分析的基础上提出了一种确定舱体应急补气速率取值范围的确定方法,综合考虑了舱体容积、漏孔通径、氧分压和总压下限要求、氧分压和总压维持时间需求,并通过两个算例验证了该方法的有效性。
Aiming at the variation of total pressure and oxygen partial pressure of manned spacecraft in the leak of sealed cabin, a simulation model of cabin pressure control system of manned spacecraft was established. By using this model, the volume of the cabin, Pressure and partial pressure of oxygen changes trend. The results show that with the increase of the size of the leaky hole or the decrease of the volume of the cabin, the time required for the total pressure and the partial pressure of oxygen to fall to the lower limit of the index is shorter and shorter. As the size of the leak hole increases, the initial rate of blow-by of the cabin increases, but the rate of blow-down decreases even faster. On the basis of the analysis, a method to determine the range of the value of emergency gas recovery rate is put forward. Considering the requirements of the volume, leakage path, oxygen partial pressure and total pressure lower limit, oxygen partial pressure and total pressure Maintain the time demand, and verify the validity of the method through two examples.