Variable Geometry Experimental Study of a Turbine Plane Cascade

Through the setting-up of a variable geometry plane cascade test rig,measured were the blade surface static pressure distribution,outlet total pressure distribution and outlet gas flow angles of a plane cascade at different installation angles.Furthermore,the regularity governing the change of various aerodynamic parameters with blade installation angles was analyzed in detail.The change of various losses of the cascade with deflection angles,which were measured during the test,was compared with the results predicted by using three loss models.The research results show that in the range of the deflection angles being measured,the blade surface diffusion section will increase conspicuously with an increase of the installation angle and the outlet gas flow angle of the cascade will also increase.Moreover,the total loss of the cascade will constantly decrease.Among them,the blade profile loss will first decrease and then increase,and both the secondary flow loss at the two ends and blade tip clearance loss will invariably drop.