深海作业用喷嘴性能仿真

Performance Simulation of Deep Sea Nozzle

为获取深海环境下喷嘴的工作性能,建立了深海围压环境下喷嘴射流的流体动力学仿真模型.采用可实现k-ε模型对射流的运动进行了数值计算.通过数值仿真获取了喷嘴性能与环境压力和喷嘴工作压力的作用规律.仿真结果表明:提高喷嘴的工作压力有助于提高射流的作业能力,但对提高有效作业距离不明显;与大气环境相比,深海围压环境下喷嘴的最大射流速度和射流的速度保持区长度均会减小,且速度保持区长度减小显著.当深海围压为8MPa、喷嘴的工作压力为5MPa时,射流最大速度减小约6%,速度保持区的长度减小约66%;在速度保持区范围内,深海围压环境下喷嘴的工作性能与喷嘴的工作压力,与环境压力成正比.

Fluid dynamic simulation model of nozzle water jet under deep sea environment is established to obtain nozzle performance under deep sea environment.Realizable k-ε model is used to calculate water jet movement.The working mechanism of water jet performance with deep sea environment pressure and nozzle working pressure is obtained with simulation.Simulation results show that water jet performance is improved with nozzle working pressure increasing,but little on the increase of potentialcore length.Compared with atmosphere environment,the maximum water jet velocity and potential core length are decreased,especially the obvious decrease of potential core length.When environmental pressure is 8MPa and nozzle working pressure is 5MPa,the decrease of maximum water jet velocity is about 6% and the decrease of potential core length is about 66%.Deep sea nozzle performance is proportional to working pressure when water jet is in range of potential core.