水下发射航行体空泡、气泡和自由面相互影响的理论研究

基于势流理论、细长体理论和奇点分布法,对水下发射过程中的航行体空泡、自由面和筒口气团的相互影响开展了理论研究。文中用一个奇点模拟气团、用沿轴线分布的奇点模拟细长体形状的航行体和空泡,建立了自由面影响下的气团和空泡相互耦合的动力学模型,提出了非定常流场中带气体泄漏现象的含气空泡的压力估算方法。实验结果验证了文中提出的模型的合理性。

Theoretical study of the interaction of the underwater-vehicle cavity,free surface and gas bubble in launching

The interaction of cavity, free surface and gas bubble around the outlet of the launch silo in the process of launching vehicles underwater is theoretically studied based on the potential theory, slender-body theory and singularity distribution method. The gas bubble is simulated by one singularity. The slender-shaped vehicle and cavity are simulated by singularities distributing along the axis. A dynamic model of the interaction of the bubble and cavity under the influence of free surface is built up. And the method estimat-ing the pressure of gas-filled cavity in the unstable flow field with gas-leakage from the cavity is proposed. The experiment verification shows that the calculated results of presented model agree exactly with the ex-perimental results.