小攻角水下航行体定常空泡外形计算方法

摘要

水下航行体上的空泡在攻角、重力及航行体的外形影响下,空泡的迎水面外形与背水面外形并不对称,这种不对称空泡外形对空泡水动力或航行体弹道有极大影响.本文结合动量原理和空泡独立膨胀原理,在小攻角条件下建立了定常三维空泡外形的方法.%Under the influence of angle of attack, gravity and the geometry of underwater-vehicle, the shapes of under-water-vehicle cavity's upstream face and downstream face are asymmetrical. The asymmetrical shape has great influence on cavity hydrodynamic and the trajectory of vehicle. Using the momentum theorem and principle of independence of the cav-ity section expansion, the paper provides a method to calculate the asymmetrical shape of cavity on a vehicle when the angle of attack is small. This method can apply to computer simulations.