射流旋涡发生器抑制进流管流动分离的数值模拟

Numerical Study on Suppression of Intake Flow Separation Using Vortex Generator Jet

关键词:  喷水推进器  进流管  流动分离  主动流动控制  射流旋涡发生器

Key words:  Waterjet propulsor  Intake duct  Flow separation  Active flow control  Vortex generator jet

摘要:

高航速时喷水推进器进流导管背部流动发生分离，加剧了喷泵的进流畸变，导致推进性能下降。本文提出在进流管上布置射流旋涡发生器（VGJ）抑制进流管的流动分离，并通过数值模拟分析了射流孔位置、射流角度、射流流量等射流参数对控制效果的影响。经参数优选后，布置在背部流动分离点前的VGJ、射流角度10°、射流流量是出流流量的2.3%时，进流管出流的不均匀度系数、旋流度、总压畸变指数分别降低35.18%，60.62%，46.42%，总压恢复系数提高了18.07%。VGJ的流动控制作用明显，工况适应性较好，为喷水推进器采用主动流动控制提升推进性能提供理论依据。

Abstract:

Flow separation occurs on the ramp wall of a waterjet propulsor intake duct at high navigation speed， which aggravates the inflow distortion in the pump face and lowers the propulsion performance. In this paper， vortex generator jet （VGJ） was arranged on the intake duct to suppress the ramp flow separation. The infection of jet parameters of hole location， inclination angle and mass flow on the control effect were studied by numerical simulation. Through sequential parameter optimization， the VGJ was arranged to be located before the ramp separation point with the inclination angle of 10° and the jet mass flow was 2.3% of the outflow. The outflow nonuniformity coefficient， swirl degree， and total pressure distortion coefficient of the intake duct were reduced 35.18%， 60.62%， 46.42% ，respectively. The total pressure recovery coefficient increased 18.07%. The VGJ configuration was proven to be effective over a wide IVR range. This paper validates a successful technique of active flow control to improve the waterjet propulsion performance.