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Application of a Passive Flow Control Device on Helicopter Rotor Blades

机译：无源流量控制装置在直升机旋翼桨叶上的应用

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摘要

Application of an efficient flow control system on helicopter rotor blades may result in improved aerodynamic performance. Recently, the invention of a passive vortex generator (rod vortex generator, RVG) has been analyzed for channel and airfoil flows proving its potential in reducing flow separation. The application of this passive flow control device on helicopter rotor blades is described in the present paper. The basic control mechanism is based on the intensification of momentum exchange in a direction normal to the wall by a streamwise vortex. High momentum air is transferred to a low momentum region close to the surface, and thus the separation bubble is reduced. The computational fluid dynamics investigation was carried out using the FLOWer code from DLR (Germany) to solve Favre-averaged Navier-Stokes equations with the chimera overlapping grids technique and linear explicit algebraic k-omega turbulence closure. The validation of the numerical model for high-speed transonic conditions is based on a comparison with the experimental and flight-test data obtained at NASA by Caradonna and Tung (model rotor in hover; NASA Technical Memorandum 81232, 1981) and Cross and Watts (AH-1G helicopter in forward flight; NASA Reference Publication 1179, 1988). It has been shown that the application of the proposed flow control system reduces the size of the separation bubble, increasing the aerodynamic performance of the rotor in both states of flight.
机译：在直升机旋翼桨叶上应用有效的流量控制系统可能会改善空气动力学性能。最近，已经对无源涡流发生器（杆涡流发生器，RVG）的发明进行了通道和翼型流分析，证明了其在减少流分离方面的潜力。本文描述了这种被动式流量控制装置在直升机旋翼桨叶上的应用。基本的控制机制基于流向涡流在垂直于壁的方向上加强动量交换。高动量空气被转移到靠近表面的低动量区域，因此分离气泡减少。使用来自DLR（德国）的FLOWer代码进行了计算流体动力学研究，以利用嵌合重叠网格技术和线性显式代数k-ω湍流闭塞来求解Favre平均Navier-Stokes方程。高速跨音速条件数值模型的验证是基于与Caradonna和Tung（悬架模型转子； NASA技术备忘录81232，1981）以及Cross和Watts（ AH-1G直升飞机；美国宇航局参考出版物1179，1988年。已经表明，所提出的流量控制系统的应用减小了分离气泡的尺寸，增加了在两种飞行状态下转子的空气动力学性能。

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  • 来源
    《Journal of the American Helicopter Society》 |2016年第1期|012001.1-012001.13|共13页
  • 作者

    Tejero F. E.; Doerffer P.; Szulc O.;

  • 作者单位

    Polish Acad Sci, Szewalski Inst Fluid Flow Machinery, Gdansk, Poland;

    Polish Acad Sci, Szewalski Inst Fluid Flow Machinery, Gdansk, Poland;

    Polish Acad Sci, Szewalski Inst Fluid Flow Machinery, Gdansk, Poland;

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