不同喷射速度下厢体气膜减阻效果的实验研究

Experimental Research on Air Film Drag Reduction Effect of Van Body at Different Jet Velocity

研究厢体表面渗透空气流的喷射速度对气膜在空气中的减阻效果的影响。通过气膜发生系统控制有气膜厢式车实验模型的气膜空气喷射速度,在30 m/s的流动空气速度下,于可调速拟层流风力发生装置中开展与无气膜厢式车实验模型的对比测阻实验,比较不同喷射速度下,有气膜厢式车实验模型的受阻情况。实验结果表明,在流速恒定的拟层流空气流体环境下,厢体表面渗透空气流有效地降低了厢体所受的空气阻力,且在一定范围内,减阻率随喷射速度的增大近似呈线性增长。

The effect on the air film drag reduction effect of van body by jet velocity of seeping air flow on van body sur- face was studied.Film air jet velocity of van experimental model with air film was controlled by air film generation system to carry out resistance measurement contrast experiments of models with and without air film in variable-speed laminar flow wind generator with an air flowing speed of 30 m/s.The resistances of experimental models in the different ejection velocity were compared.Experimental result shows that in a condition of constant speed of laminar flow wind, seeping air flow on van body surface can effectively reduce wind resistance on van body.In a certain range, the drag reduction rate is increased with increasing of jet velocity as approximately linear growth.