螺旋桨瞬态风车阻力确定技术研究

Research on determination technology of propeller transient windmill resistance

针对某螺旋桨停车顺桨和空中起动过程中瞬态风车特性开展仿真计算,定量给出了螺旋桨瞬态风车阻力,并利用风洞试验对仿真结果进行验证。通过对标准螺旋桨效用因子和零升迎角的修正,获取修正后螺旋桨风车特性,利用最小二乘法给出螺旋桨风车特性最优解。研究表明:停车顺桨中桨叶角先略有减小,后迅速增大,转速下降速率逐渐增大;起动回桨过程中螺旋桨转速增大,桨叶角减小,风车阻力先增大后减小,回桨至14°时,瞬态风车阻力达到最大值。所得结果可为涡桨发动机试飞中的风车阻力确定及试验点规划提供技术支撑。

Based on the transient windmill characteristics during the air starting process,simulation calculations were carried out.The thrust of propeller windmill at different test conditions were given quantitatively.The key points of the scaled-down model were verified by wind tunnel.The corrected propeller windmill characteristic was obtained by correcting the utility factors and zero-lift angle in the standard propeller characteristics.The least square method was used to obtain the optimal solution of the propeller windmill characteristics.The results show that during the shutdown feather,the blade angle decreases slightly,and then rapidly increases,and the rate of speed decrease gradually increases.During the starting process,the rotating speed increases and blade angle decreases,the propeller windmill resistance increases and then decreases.When the blade angle is 14°,the thrust of propeller windmill reaches its maximum.The results provide technical support for the determination of windmill resistance and the planning of test points in turboprop engine flight test.