两相流相互作用下的船模微气泡减阻性能数值仿真

基于两相流理论,对集装箱船船模进行微气泡减阻性能数值仿真研究。分析船模在不同喷气口位置、流体含气率、不同喷射速度和角度下的流场分布和减阻效果。结果表明：当流体微气泡含量过高时,会增大船体摩擦阻力,流体含气率为10%~20%时,有较好的减阻效果,喷气口位置在距离球鼻艏后缘约三分之一船长附近具有较高的空气覆盖率,喷气口喷气方向垂直向下所产生的减阻效果比喷气方向偏向船侧效果要好,且船速较高时可允许较高含气率流体注入流场并增大减阻效果。

Numerical simulation study of ship model microbubble drag reduction based on two-phase flow interaction

Numerical simulation of microbubble drag reduction performance of container ship model is carried out, based on two phase flow theory. And analyze the flow field distribution and drag reduction effect of ship model under different nozzle position, fluid void fraction, injection speed and angle. The results show that: When the content of microbubble is too high, the frictional resistance of ship hull will be increased, and the void fraction of fluid is 10%~20%, the frictional drag reduction effect is better. The nozzle opening position has higher air coverage near the captain about one third of the rear edge of the bulbous bow, and the drag reduction effect of the nozzle jet direction is better than that of the jet direction toward the side of the ship. When the ship speed is higher, the flow field with higher gas content can be injected into the flow field and the drag reduction effect can be increased.