基于静态压降法量化表征某型贮箱气密性方法研究

Quantitative Characterization on Gas Tightness of Certain Tank Based on Static Pressure Drop Method

目的弥补运载火箭靶场测试中仅采用静态压降法定性判定贮箱气密性的不足,进一步提高贮箱气检结果的可信度。方法提出基于静态压降法量化表征某型贮箱气密性的方法。首先,依据气体理想状态方程,得出基于静态压降法表征贮箱气密性的量化方法,并对计算结果进行验证。其次,综合考虑箱压变化、温度、大气压力、稳压时间和测量时间等影响因素,对上述量化方法进行修正,得到基于静态压降法表征某型贮箱气密性改进型量化计算方法。结果改进后的计算方法精度更高。在此基础上,通过对限制改进型量化计算方法精度的影响因素进行分析,提出了进一步提高改进型量化计算方法精度的优化措施。结论提出的基于静态压降法量化表征某型贮箱气密性方法可行,能够为后续更好开展靶场气检工作提供有力支撑。

The work aims to make up for the deficiency that only static pressure drop method is used to qualitatively deter-mine the gas tightness of the tank in the range test of carrier rocket,and further improves the credibility of the gas detection re-sults of the tank.A method for quantifying the gas tightness of a certain tank based on static pressure drop method was pre-sented.Firstly,according to the ideal state equation of gas,a quantization method based on static pressure drop method was ob-tained to characterize the gas tightness of the tank,and the calculation results were verified.Secondly,considering the affecting factors such as tank pressure variation,temperature,atmospheric pressure,pressure stabilization time and measurement time,the above quantization method was modified,and an improved quantitative calculation method based on static pressure drop method was obtained to describe the gas tightness of the tank.The improved calculation method had higher accuracy.On this basis,through the analysis of the factors that limited the accuracy of the improved quantitative calculation method,the optimization measures to further improve the accuracy of the improved quantitative calculation method were put forward.The method of quantifying the gas tightness of the tank based on static pressure drop method proposed is feasible,which can provide strong support for the subsequent better gas detection in the range.