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Flow analysis of a helicopter engine side air intake

机译：直升机发动机侧进气口的流量分析

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摘要

A detailed experimental and numerical investigation on the flow characteristics of an engine side air intake of a lightweight helicopter is conducted. The experimental dataset is obtained in a comprehensive wind-tunnel campaign on a novel full-scale model of a helicopter fuselage section. In the wind-tunnel tests, engine mass flow rates corresponding to realistic helicopter operating conditions are reproduced. For fast forward-flight conditions, fivehole pressure probe data in the aerodynamic interface plane as well as local surface pressure distributions are compared with the data obtained by unsteady Reynolds-averaged Navier-Stokes simulations. Regarding the corresponding numerical sectional fuselage case, all components of the wind tunnel model and the essential wind tunnel parts are comprised. To assess the influence of the truncation of the fuselage, an additional full fuselage case is investigated. A good agreement of the numerical simulations and the wind-tunnel data is achieved. The investigation of the side intake geometry yields a distorted total pressure distribution in the aerodynamic interface plane with regions of high and low total pressures. The origin of the aerodynamic interface plane total pressure distribution is explained in detail, analyzing the flow topology in the inlet region and the engine intake duct.
机译：对轻型直升机发动机侧进气口的流动特性进行了详细的实验和数值研究。实验数据集是在直升机机身截面的新型全尺寸模型的全面风洞运动中获得的。在风洞测试中，再现了符合实际直升机工况的发动机质量流量。对于快速的前向飞行条件，将空气动力学界面平面中的五孔压力探头数据以及局部表面压力分布与通过非稳态雷诺平均Navier-Stokes模拟获得的数据进行比较。关于相应的数字截面机身外壳，包括风洞模型的所有组件和基本的风洞部件。为了评估机身被截断的影响，还研究了另外一个完整的机身情况。数值模拟与风洞数据实现了良好的一致性。对侧面进气口几何形状的研究在空气动力学界面平面中产生了总高和低总压力区域扭曲的总压力分布。通过分析进气区域和发动机进气管道中的流动拓扑，详细说明了空气动力学界面平面总压力分布的起源。

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  • 来源
    《Journal of propulsion and power》 |2017年第5期|1230-1244|共15页
  • 作者

    Knoth Florian; Breitsamter Christian H.;

  • 作者单位

    Technical University of Munich, Garching, Germany,Chair of Aerodynamics and Fluid Mechanics, Boltzmannstraße 15, Germany;

    Technical University of Munich, Garching, Germany,Chair of Aerodynamics and Fluid Mechanics, Boltzmannstraße 15, Germany;

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