Research On Particle Trajectory Based On Lagrange Description

Aircraft icing has always been a major threat to aircraft safety.In recent years,flight safety accidents caused by aircraft icing still occur many times.Therefore,scholars have been committed to the research related to aircraft icing.Aiming at the current research status and trend in the field of particle trajectory,this thesis makes the following research work: Firstly,the numerical study of uncoupled particle trajectory is carried out,and the trajectory of supercooled water droplets is taken as the research object.The trajectory of supercooled water droplets is obtained by Lagrange method,and the local collection coefficient of airfoil surface is obtained by particle statistical method.Based on the above method,the local water collection coefficient of airfoil is verified and calculated,the results are consistent with the existing icing prediction software,which verifies the feasibility of the method used in this thesis.Secondly,based on the original uncoupled particle trajectory research,this thesis introduces the rebound splash characteristics of supercooled large water droplets.The collection coefficient of airfoil is verified and calculated.And the collection coefficient without considering and considering the rebound splash effect is consistent with the results given in the references,which verifies the feasibility of the method used in this thesis.Finally,the numerical study of coupled particle trajectory is carried out,taking the motion trajectory of ice crystal as the research object.The mathematical model of heat and mass transfer of ice crystal is introduced.Taking the three-dimensional single channel model of a transonic compressor as an example,the heat and mass transfer effect of ice crystal in the compressor is studied.The variation of ice crystals in the compressor under different parameters is obtained.And the influence of ice crystals on the internal flow field of the compressor under different parameters and the working characteristics of the compressor after sucking in ice crystals are obtained.