摘要
为了探究水下航行体在航行过程中是否存在一种非分离层流状态,本文根据负压梯度的流线型外形设计方法,得到一种能保持非分离层流状态的回转体外形UA-100。在低于临界体积雷诺数的情况下,采用FLUENT软件中的层流模型对其进行不同速度的模拟,并且考虑空化的影响。研究发现:在无空化时表面压力系数与理论吻合一致,且与速度无关;表面摩擦力与理论值也吻合较好;壁面剪切力大于零,流动没有发生分离。所设计的外形在一定的范围内,确实存在无空化、不分离的层流流动状态,为航行体减阻提供了参考。
To know whether there is a laminar flow state without boundary separation during the voyage of a vehicle underwater,a special revolved body shape,named UA-100,which can maintain non-isolated laminar flow state,was obtained according to the design method of a negative pressure gradient streamline shape.The laminar model in Fluent was selected to simulate the underwater voyage at different speeds under the condition that the Reynolds numbers were less than the critical value,and the cavitation effect was also considered.It was found that the pressure coefficients of surface coincide with the theoretical values and have nothing to do with speed when there is no cavitation;the surface friction forces also sufficiently coincide with the theoretical values;and the wall shear stress is greater than zero,demonstrating that the flow is non-isolated.Non-isolated laminar flow state without cavitation really exists in a certain range of speed in the application of the designed shape.This provides a reference for the drag reduction of navigation vehicles.
作者
刘平安
刘进波
张智豪
LIU Ping′an;LIU Jinbo;ZHANG Zhihao(College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2020年第5期650-654,共5页
Journal of Harbin Engineering University
基金
中央高校基本科研业务费专项资金项目(HEUCFG201815)。
关键词
流线型
负压梯度
非分离
回转体
临界雷诺数
层流
空化
数值模拟
streamline surface
negative pressure gradient
non-isolated
revolved body
critical Reynolds number
laminar flow
cavitation
numerical simulation
