不同来流工况下泵喷推进器外流场特性分析

Analysis of the flow characteristics of pump-jet propeller under different inflow conditions

作为一种新型的推进方式,泵喷推进器得到了越来越广泛的使用,其外流场会影响推进效率,因此对外流场的研究至关重要。该文以泵喷推进器模型为研究对象,基于SST湍流模型对其外流场进行数值模拟,结果表明:实验和数值模拟结果吻合得较好;当进速系数较低时,导管出口的高速射流会卷吸周围的流体一起运动,并且射流半径减少至一定程度时不会随着进速的增加而改变;随着进速系数的逐渐增大,在导管入口处会产生流动分离,并形成负压区;射流场中湍动能最大区域出现在叶片半径75%处,并且射流场中的湍动能随着进速系数增加而减小。该研究有助于了解泵喷推进器外流场特性,为今后泵喷推进器的相关优化设计工作提供指导。

As a new type of propulsion, the pump-jet propulsion has been more and more widely used. It is very important to study the flow field of pump-jet propulsion as it will affect the propulsion efficiency. In present paper, SST turbulent model is used to study the flow field of pump-jet propulsion as it will affect the propulsion efficiency. In present paper, SST turbulent model is used to investigate the flow field of pump-jet propulsion. The numerical results agree well with the experimental results.When the advance coefficient is small, the high-speed jet will entrain the low-speed fluid around it. With the increasing value of advance coefficient, flow separation will occur and a negative pressure zone will be formed near the leading edge of duct. When the radius of the high-speed jet decreases to a certain value, the radius of the high-speed jet will keep the same. The maximum value of turbulent kinetic energy occurs at 75% of the blade radius. The turbulent kinetic energy in the jet field decreases as the increasing value of advance coefficient. The study will help us understand the mechanism of the outflow field of pump-jet propulsion, which can provide guidance for the optimization of pump-jet propulsion in the future.