Hover Performance in Ground Effect Prediction Using a Dual Solver Computational Methodology

A. Moushegian, D. Wachspress, Marilyn J. Smith, G. Whitehouse
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引用次数: 1

Abstract

Rotorcraft operation in ground effect is an essential phase of every rotorcraft mission. Accurate prediction of this aerodynamic regime has implications for the design of the rotor, vehicle, and mission guidelines. Modern rotorcraft designs require higher fidelity predictions of the aerodynamics beyond the capabilities of momentumbased or algebraic models of ground effect, but high-fidelity computational fluid dynamics (CFD) remains intractably expensive. A hybrid CFD-free-wake solver OVERFLOW-CHARM has been developed for application to this problem. It was validated against thrust, power, and flow visualization data obtained experimentally for a micro-scale rotor hovering out of ground effect and in ground effect at a range of heights between h/R = 0.5 and h/R = 2.5. A study of numerical options was performed to ensure confidence in the computational simulations. The results demonstrated that OVERFLOW-CHARM was able to capture the integrated rotor loads within three percent of a conventional OVERFLOW simulation at twenty percent the computational cost, and that qualitative agreement in the predicted flow fields was observed between OVERFLOW-CHARM, OVERFLOW, and experiment.
用双求解器计算方法预测地面效应中的悬停性能
旋翼机地效操作是旋翼机各项任务的重要组成部分。准确预测这一空气动力学机制对旋翼、飞行器和任务指南的设计具有重要意义。现代旋翼机设计需要更高保真度的空气动力学预测,而不是基于动量或地面效应的代数模型,但高保真度的计算流体动力学(CFD)仍然非常昂贵。为了解决这一问题,开发了一种cfd -free-尾迹混合求解器OVERFLOW-CHARM。在h/R = 0.5 ~ h/R = 2.5的高度范围内,对无地效和有地效悬停的微尺度旋翼进行了推力、功率和流量的可视化实验验证。为了保证计算模拟的可信度,进行了数值选择的研究。结果表明,OVERFLOW- charm能够以20%的计算成本在传统OVERFLOW模拟的3%内捕获集成转子负载,并且在预测流场中观察到OVERFLOW- charm, OVERFLOW和实验之间的定性一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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