The Un-running Design For Aircraft Engine Blades

The working environment of aero-engine blade is sever.Aero-engine blade will be deformed,under the joint action of high temperature and pressure,the deformation can lead to a decrease in aero-engine blade,even with serious consequences.Therefore,it is necessary to do the un-running design for aero-engine blade.To make sure that the blade in the working condition is consistent or basically consistent with the blade in the optimal design condition,by offsetting the deformation with correction.To finish the un-running design and the extended design of blade,this paper takes Rotor67 and skew-sweep blade as the research object,by using analysis software such as UG,NUMECA and etc.comprehensive.In the relevant study,? modification of nodal coordinates for un-running design is proposed.At the same time,the influence of the number of intercepted nodes of blade tip/root on out-extend design is studied.The specific research content is as follow:(1)Creating the Rotor67 entity model,based on the public geometric data of Rotor67 by NASA.And the aerodynamic performance analysis of Rotor67 was completed.The complex blade is constructed,according to the definitions and concepts of skew-sweep blade.And the aerodynamic performance analysis of skew-sweep blade was completed.(2)Based on the modification of nodal coordinates,a new un-running design method is proposed.Fitting the functional relationship between the deformation and height of blade with polynomial.? modification of nodal coordinates(? nodal coordinates)is proposed as a result of introducing ? coefficient that consisting of the absolute value of the slope of the curve into the modification of nodal coordinates(nodal coordinates).The un-running design of Rotor67 and skew-sweep blade were completed with the new method.The results showed that in the un-running design of Rotor67 with smaller deformation(about 3mm),the iteration number of ?-coordinate method was reduced by 7.14% compared with that of coordinate method.In the un-running design of skew-sweep blade with large deformation(about 5mm),the iteration number of ?-coordinate method was reduced by 28.57% compared with that of coordinate method.(3)Three node coordinates of the tip/root of Rotor67 blade and skew-sweep blade are taken and projected onto the X-Y and X-Z plane.Fitting the function between nodes and height of blade,based on three-node parabola out-extend method.The extended surface is obtained according to the extension.And the aerodynamic performance analysis were carried out.Beside,this paper has studied the influence of number of nodes on the parabolic fitting effect.And founded the rule of intercepted nodes between the fitting effect and aerodynamic performance.