Safety margins analysis on turbocharging system in aircraft piston engine

Aiming to safety and power requirements for unmanned aerial vehicle(UAV) during high altitude long endurance,a simulation model was initially established for a certain aircraft piston turbocharger engine through using the MATLAB/Simulink.The model was constituted by four parts:turbocharger model,mean value engine model,intercooler model and waste gate model.The feasibility of model was verified by empirical data.Then,according to analysis safety margin of turbocharger engine level,the safety requirement for turbocharger engine was proposed,and the impact of key parameters on system safety have been researched.Finally,based on safety margins principles for waste gate was demonstrated,which made the whole turbocharger system of aircraft piston engine performed within the safety margins.The result indicates that the model-based research on turbocharger engine system can obtain safety margin of system,provide reference for further improvement of turbocharger engine system at an acceptable safety level,and ensure the safety requirement during design period.