Study On Ignition Optimization Scheme Of CFM56 Series Engines In High Plateau Airport Environment

With the rapid economic development,there are more and more high plateau airports.Due to the high plateau,large temperature difference between day and night,thin air and other characteristics of high plateau airports,the cold start failure of overnight aircraft often occurs in high plateau airports,which brings great pressure to the smooth operation of airlines.Therefore,this thesis takes CFM56-5B,which is widely used in high plateau airports,as the research object,analyzes the reasons for start-up failure of high plateau airports,and puts forward improvement measures.The main work of this thesis is as follows:(1)The reason of cold start failure of high plateau airport engine is analyzed.High plateau airport air thin,fuel atomization effect is poor,the maximum ignition energy provided by the engine can not ignite the oil and gas mixture,resulting in startup failure.(2)The influence of high environment fuel atomization is studied.The boundary conditions of engine working at high plateau were determined by using the international standard atmospheric calculation formula and quick access record data,and the effects of single parameters such as atmospheric pressure,engine fuel supply pressure and fuel temperature on fuel atomization were analyzed.Furthermore,the comprehensive effects of low atmospheric pressure,low oil temperature and low fuel supply pressure on fuel atomization in high plateau environment were studied by theoretical calculation and numerical simulation.(3)The optimization scheme of cold start ignition for high plateau airport is proposed.Taking Kunming Changshui International Airport as the reference,the improvement idea of increasing fuel supply pressure and delaying ignition is put forward.Through theoretical calculation and VOF and DPM models,specific optimization schemes for different high plateau airports under different conditions are given.This thesis not only provides solutions to the problems of cold ignition failure of aircraft in high plateau operation,but also provides some reference for the development and design of domestic large culvert turbofan.