多级漏孔泄漏分析及其漏率预测方法研究

On the multistage leak and prediction of its leakage rate

为了评估气体介质经多级漏孔的泄漏量,指导多道密封结构的安全设计,有必要研究气体经多级漏孔的泄漏特性。通过建立双级与多级漏孔的数学模型,在不同的初始条件下对多级漏孔的泄漏特性进行了计算分析。结果表明:多级漏孔的稳定漏率仅与各级独立漏孔漏率有关,与中间空腔体积无关,其倒数等于各级漏孔漏率的倒数之和。影响稳定时间的因素包括末级漏孔的漏率、其余各级漏孔组成的多级漏孔漏率以及中间空腔的容积。利用分析结果,提出了多级漏孔漏率的预测方法。

To evaluate the gas leakage rate passing through a multistage leak so as to provide the reference for the safe design of multiple-leak-proof construction, the mathematical models were developed for two-stage and multistage leaks to calculate and analyze the leaking behavior of a multistage leak under different initial conditions. The results revealed that the steady leakage rate from a multistage leak just relates to that of each and every independent stage but is irrelevant to the volume of intermediate cavity. What＇s more, the reciprocal of multistage leakage rate is equal to the sum of all reciprocals of the independent stages. The influencing factors on the steady leaking time include the leakage rates of last stage and of the rest and the volume of all intermediate cavities. The way to predict the leakage rate passing through a multistage leak is thus presented.