School of Mechanical and Materials Engineering,North China University of Technology
为了研究桨距角对共轴对转螺旋桨产生的气动影响,改善其气动性能,在来流马赫数0.453的情况下,通过调节后桨桨距角的方式对6×6构型的对转螺旋桨进行数值计算,研究了桨距角对共轴对转螺旋桨桨间气动干扰的变化规律。计算中使用了非定常雷诺平均纳维-斯托克斯(URANS)方程结合SST湍流模型的方法,并采用了T-Rex高质量网格生成技术。计算结果表明：共轴对转螺旋桨前后桨之间存在着复杂的气动干扰,后桨能够吸收一部分前桨的切向滑流能量,气动效率高于前桨,前后桨的气动参数在一个旋转周期内出现12次周期性波动。在前桨桨距角为54°和56°情况下,减小后桨桨距角,前桨效率有小幅度提升,后桨拉力系数和功率系数则较大幅度提升,后桨效率分别提升了4%和6.4%,后桨 Ct、 Cp 和 n 的脉动幅度增大。另外,为了抵消前、后桨扭矩以及提升共轴对转桨整体气动性能,在该工况下应适当减小后桨桨距角。
In order to study the aerodynamic influence of pitch angle on the contra rotation propeller (CRP) and improve its aerodynamic performance, at the inlet Mach number of 0.453, by adjusting the pitch angle of the aft propeller, a 6×6 contra rotation propeller was numerically calculated, and the variation law of pitch angle on aerodynamic interference between the contra rotation propeller was studied. The Unsteady Reynolds-Averaged Navier-Stokes (URANS) equation combined with the SST turbulence model is used in the calculation, and the T-Rex high quality mesh generation technique is used. The calculation results show that there is complex aerodynamic interference between the front and aft propellers of contra rotating propeller, the aft propellers can absorb a part of the tangential slip flow energy of the front propellers, and the aerodynamic efficiency is higher than that of the front propellers. The aerodynamic parameters of the front and aft propellers fluctuate 12 times in a rotating cycle. When the pitch angle of the front propellers is 54° or 56°, the efficiency of the front propellers is slightly improved when the pitch angle of the aft propellers is reduced, while the pull coefficient and power coefficient of the aft propellers are significantly increased, and the efficiency of aft propellers increased by 4% and 6.4%. The Ct 、 Cp and n fluctuation amplitude of the aft propeller increases. In addition, in order to offset the torque of the front and aft propellers and improve the overall aerodynamic performance of the contra rotation propeller, the pitch angle of the aft propellers should be appropriately reduced under this working condition.