Simulation And Prediction Of The Leakage Of Aerostat Ballonet

As a kind of environmentally friendly aircraft,aerostat has the advantages of low energy consumption,long hang time,good stealth performance.Aerostat is widely used in environmental monitoring,security early warning and other fields.The safety of aerostat is related to the leakage of ballonet.Therefore,in order to solve the safety performance problem of the aerostat,it is necessary to carry out ballonet leakage simulation and prediction research to provide theoretical support.In this paper,aerostat is taken as the research object,theoretical calculation,numerical simulation,experimental analysis and other methods are used to study the leakage problem of ballonet.First of all,the relevant atmospheric environment model,convective heat transfer model,radiation heat transfer model and leakage model are established.Then,an improved differential pressure leak detection method,equivalent differential pressure method,is proposed to solve the shortcomings of the traditional leakage detection method under complex atmospheric environment.The method combines the finite element software Fluent and the theoretical calculation to analyze the ballonet leakage.The influence of leak hole and the external air environment on the ballonet leakage are analyzed,and the relevant rules are obtained.In order to analyze the relationship between ballonet leakage and ballonet leak hole area,ambient temperature,leakage time,and get the mathematical model,orthogonal test is carried out.On the basis of that,range analysis and regression analysis are carried out to get the primary and secondary factors on the ballonet leakage,and the optimum regression equation is established.Finally,the simulation results are validated by the team's self-designed floating ballonet leakage detection platform,the error is less than 5%,which proves the reliability of the model.