The Euler/Kirchhoff method is adopted to calculate the far field noise of UH-1H rotor,and the calculated results are compared with the measured data.The effect of rotor blade tip shape on high speed rotor noise is investigated.The results show that,with the decreasing of airfoil thickness near the blade tip or the increasing of the taper ratio near the blade tip and the sweep of the blade tip, the high speed rotor noise can be reduced to some extent.

The description of the moving grid-strategy is presented. Based on transfinite interpolation, an O-H type grid around one blade is generated. In each subdomain, the weighting funtion is given to account for the time-variation of its nodes. The multi-block grid modelling the whole rotor is achieved by the construction of grid-blocks around each blade which are connected with coincident nodes on their common boundaries, the flowfield of a rotor is calculated by considering the transport of interface information. The calculated results show that the moving grid possesses feasibility and effectiveness.