B.H.型气泡滑行艇阻力模型试验研究

Experimental study on the resistance of bottom hollowed air cavity planning craft

通过艇底开槽的B.H.型气泡滑行艇(简称为B.H.艇)气层减阻的模型试验,初步研究了不同因素(气流量、艇速、开槽方式等)对B.H.艇的气层减阻规律及运动姿态的影响,并对艇底流态进行了较全面的观测。结果表明:当空腔在艇底的投影面积相同时,不同开槽方式对喷气减阻效果的影响不大;航速与气流量均是影响B.H.艇气层减阻效果的重要因素,在饱和气流量下B.H.艇的相对减阻率可达50%以上,绝对减阻率可达15%以上。开槽使得不喷气时的阻力增加较大,但空腔对保持气层的稳定性是相当有利的。

The effects of some parameters, such as air flow rate, hull speed and the form on the resistance of air cavity planning craft and its motion are experimentally investigated, of bottom hollow, and the flow field surrounding the craft＇s bottom is revealed by flow visualization techniques fairly systematically. Some results can be taken as follows： the two different hollowed bottoms but with same projection area on horizontal plane have little influence on resistance reduction rate.The most important factors affecting resistance reduction are hull speed and air flow rate.The relative resistance reduction rate is about 50% and the absolute resistance reduction rate is about 15% at saturated air flow rate. However, the hollowed bottom makes the craft＇s resistance increase without air injection, while it can preserve the air cavity stable effectively.