不同喷气结构对航行体高速入水冲击的影响研究

开展了不同头部喷气结构对高速入水航行体降载作用影响的数值模拟研究。结果表明,对于不同等直径喷嘴,相同喷气量下航行体入水空泡形态及压力分布发展过程接近,降载效果基本相同。与无喷气时相比,最大入水最大冲击力和压力可分别降低92%和98%。收缩型喷嘴形成的附体空泡保护层明显小于等直径方案,降载效果削弱。喷嘴扩张较小时头部喷气降载和减阻效果略低于等直径方案,随喷嘴出口扩张比增大,其效果降低。

Research on the Influence of Different Nozzle Structures on the Impact of High-Speed Water-Entry Vehicles

The effect of different nozzle structures on the impact reduction of high-speed water-entry vehicle was numerically studied in this paper. The results show that, for the isodiameter nozzles, the development of cavity shape and impact pressure of the water-entry vehicles are similar under the same jet volume, thus obtaining the same impact reduction. The maximum impact force and pressure could be reduced by 92% and 98%, respectively. The protective attached cavity layer formed by the shrinking nozzle is smaller than the isodiameter ones, weakening the impact reduction effect. For expansion nozzle, the benefits on the impact and drag reduction decreases with the increase of the diffusion.