复合振动翼型跨声速非定常流计算

在文献1]、2]的基础上,本文把绕翼弦中点作旋转振动的翼型跨声速流计算推广到翼型作水平、垂直方向的平移振动以及平移与旋转振动的叠加。本方法主要特点是网格与翼型一起运动,对无穷远及翼面边界条件作了精确的处理以及计算网格数很少。本文结果对进一步研究旋翼、叶轮转子等的非定常气动力将有重要的意义。

UNSTEADY TRANSONIC FLOW CALCULATIONS FOR MULTIPLE OSCILLATING AIRFOIL

Inviscid, unsteady transonic flows over the NACA 0012 airfoil for sinusoidal pitching oscillations about the midchord were calculated using a finite-difference analog of the Euler equations (1], 2]). In the present paper, the extension of the unsteady transonic flow calculations to include perpendicular and horizontal oscillations and the superposition of pitch and translations is developed. The characteristic of the method is that the grid motion together with the airfoil, the boundary conditions in infinity and on the surface of the airfoil will be exactly satisfied and the full field is covered with a fewer number of grids having a total of about 600 nodes. The work will be significant to solve the unsteady airforce for the rotor of turbine and helicopter.