blade loss
2.3.Two method: d-object function and Euler equation method, loss-object function and Navier-Stokes equation method, are compared, so that the method can be obtained, which can shortened the time of calculating flow field and then shorten the time of optimal design of compressor blade.
3.Abstract: This paper uses the topology theory to analyze the surface flow spectrums of straight, positively curved and negatively curved cascades with relative tip clearances of 0.023 and 0.036, finds apparent differences of topology and vortex structures in the blade tip and the suction side wall corner of single type of cascade with this two clearances, and studies the mechanism of the difference formation as well as their effects on the energy loss.
4.Abstract: A new aerodynamic design system developed by authors for draft fan with enhanced efficiency,suppressed noise,enlarged flux and high load.The new design system features:A twist regulation for vortex control is employed in designing to lessen the secondary flow loss in the blade tip and hub;The feasibility and high efficiency of this procedure has been verified by the tests of the prototype fan;A new computer-aided 3D blading is used to optimize the blade;Numerical inverse checking is adopted to enhance accuracy in designing and cut down the period of the designing and production.This design system can make the optimized blade with "forward inclination ", "inclining sweep ","bending sweep ",to minimize the various secondary flow losses,to expand the steady working range of the fan,and to suppress the aerodynamic noise source.
5.A new aerodynamic design system developed by authors for draft fan with enhanced efficiency,suppressed noise,enlarged flux and high load.The new design system features:A twist regulation for vortex control is employed in designing to lessen the secondary flow loss in the blade tip and hub;The feasibility and high efficiency of this procedure has been verified by the tests of the prototype fan;A new computer-aided 3D blading is used to optimize the blade;Numerical inverse checking is adopted to enhance accuracy in designing and cut down the period of the designing and production.This design system can make the optimized blade with "forward inclination ", "inclining sweep ","bending sweep ",to minimize the various secondary flow losses,to expand the steady working range of the fan,and to suppress the aerodynamic noise source.
