Effects of Geometry Parameters on Incidence Characteristics of Turbine Low Pressure Guide Vane

Experimental measurements were performed in a low speed wind tunnel for both original and modified turbine LGV's which are used in turbofan engines under different operating conditions.Compared with the original design,the modified design changed many geometry parameters,including adopted optimizing meridional endwall profile,positively curved blade,aft-loading airfoil and negative incidence angle at the leading edge,so the incidence characteristics of these two designs differ significantly.The two LGV's were measured at three operating conditions,i.e.positive incidence,design and negative incidence operating conditions.Results show that the modified design not only has smaller energy loss,but also has better incidence angle adjustability,which means that with the change of operating conditions total pressure loss alters smaller in the range of three operating conditions.Exit loss of the original design is sensitive to the incidence angle and varies greatly.