水下航行体多孔排气融合特性试验研究（英文）

Experimental Study on Air Bleed Fusion of Underwater Vehicle

利用多孔排气产生融合的空泡可以改变水下航行体压力分布,从而进一步改变其水动力特性.气体通过多孔排出后会与水掺混破碎产生大量气泡,在特定条件下,这些气泡会在下游融合成为一个等压空泡.本文针对多孔排气的气泡融合特性开展了研究,建立了垂直提拉试验系统,给出了多孔排气气泡融合物理景象与压力特征;研究了气体流量、模型速度、开孔直径对于气泡融合特性的影响规律;通过量纲分析,给出了多孔排气影响气泡融合的无量纲数,并建立了单排孔条件下气泡的融合判据.

The air bleeding through holes and good fusing together within certain area on the model surface would change the pressure distribution on the model and vary the hydrodynamic characteristics of model motion.The close-look at air bleeding discovered that the gas jet from hole is mixed with or broken by the water to form large number of bubbles,and under certain condition the bubbles fused downstream.The effects of mass flow rate,model speed and hole diameter on fusion phenomenon were studied experimentally in a special facility also.The dimension analysis was done based on the experiment results and a criterion is suggested to evaluate possibility of fusion.