基于对飞行员工效影响的旋翼螺旋桨流动及噪声分析

倾转旋翼飞机的主要噪音来源于螺旋桨,而噪声对飞行员工效具有非常大的影响。本文在分析噪音对飞行员工效影响的基础上,使用计算流体力学(CFD)方法对优化设计的旋翼螺旋桨流场进行了计算分析。通过数值计算得到了旋翼螺旋桨的拉力特性、功率特性等气动性能参数。螺旋桨的拉力系数CT、功率系数CP都随着进速比J的增大而减小,螺旋桨的推进效率随着进速比的增大,先增大后减小,在设计点附近,螺旋桨推进效率达到0.87以上。采用Lowson方法对螺旋桨的辐射噪声进行了初步分析,随着螺旋桨转速的提高,各方位总声压级指向性一致,并有所提高。

Aerodynamic Performance and Noise Analysis of Rotor Propeller Based on the Pilot Effectiveness

The main noise of tilt-rotor aircraft comes from the propeller, and the noise has a great impact on the efficiency of pilots. Based on the analysis of the noise effect to the pilots, the flow field of the designed rotor propeller is analyzed by the computational fluid dynamics method (CFD). The aerodynamic performance parameters of the rotor propeller, such as the thrust and power performances, are obtained by numerical calculation. The thrust coefficient CT and power coefficient CP of the propeller decrease with the increase of the advance ratio J. The propeller"s propulsion efficiency increases first and then decreases with the increase of the advance ratio J. the propeller"s propulsion efficiency reaches above 0.87 around the design point. Lowson method is used to analyze the radiated noise of the propeller. With the increase of the rotating speed of the propeller, the directivity of the total sound pressure level in all directions is consistent and improved.