摘要:
提出了一种采用轨道拖车搭载螺旋桨的临近空间螺旋桨地面试验方法。利用中航工业特种飞行器研究所的高精度拖车试验台控制螺旋桨前进速度,螺旋桨转速由伺服电机控制。针对新设计的临近空间低雷诺数螺旋桨,依据等前进比和等雷诺数相似准则,进行了螺旋桨在不同飞行高度下气动特性的地面试验研究。通过试验数据与片条理论及CFD方法计算结果的对比分析,验证试验方法的可行性及螺旋桨气动性能。结果表明:(1)由于桨尖马赫数较低,等前进比和等雷诺数相似准则适用于新设计的临近空间螺旋桨地面试验;(2)不同飞行高度下螺旋桨地面试验数据与计算结果吻合良好,说明提出的方法是可行的,可为同类螺旋桨试验提供参考。
关键词:
-
临近空间
/
-
螺旋桨
/
-
相似准则
/
-
雷诺数
/
-
前进比
Abstract:
A new experimental technology for testing the aerodynamic performance of near space propeller by a railcar on the ground is proposed,in which the advance speed of the propeller is controlled by a high accuracy railcar,and the rotation speed of the propeller is controlled by a servo-electromotor.According to the equal Reynolds number and equal advance ratio similarity criterion,ground experiments including thrust and torque measurement were carried out to inves-tigate the designed near space propeller aerodynamic characteristics at different flight altitudes, and the experimental data was compared with computational results by strip theory and CFD method.The results indicate that:(1 )because the Mach number at the tip of the propeller is lower,the equal Reynolds number and equal advance ratio similarity criterion is appropriate for the designed near space propeller experiment on the ground;(2 )the ground experimental data of propeller at different altitudes agree well with computational results,and thus it is proved that the new experimental method is feasible and can provide a reference for similar propeller tests.
下载:
