Computational aerodynamic analyses of rotorcraft main rotor blades are performed in both hover and forward flight. The open-source SU2 code is used for rotor performance prediction. The core of the code is the set of RANS equations, which are solved for determining the flow. In hover, both steady-state and time-accurate modelling techniques of varying complexity are used and assessed. Simulation specific parameters which have a significant influence on the solution are also addressed. In forward flight, the code is developed to include the main rotor blade kinematics which is a prerequisite for modelling a trimmed rotor. Two databases are used for the validation of the rotor performance prediction. The renowned Caradonna-Tung experimental tests of a model rotor are used to evaluate the pressure distribution along the blade during hover. The extensive aerodynamic and aeroacoustic data survey of the AH-1G Cobra helicopter is used to assess the pressure distribution at different advancing and retreating azimuth angles during forward flight. The prediction capabilities of the solver in terms of rotor performance are demonstrated and are overall in good agreement with the measured data.

中文翻译：

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用于旋翼机流量的开源 CFD 工具包 SU2 的开发和初步评估

旋翼机主旋翼叶片的计算空气动力学分析在悬停和前飞中进行。开源 SU2 代码用于转子性能预测。代码的核心是一组 RANS 方程，求解这些方程以确定流量。在悬停中，使用和评估具有不同复杂性的稳态和时间精确建模技术。还讨论了对解决方案有重大影响的仿真特定参数。在前飞中，开发的代码包括主旋翼桨叶运动学，这是对修整旋翼进行建模的先决条件。两个数据库用于验证转子性能预测。著名的 Caradonna-Tung 模型转子实验测试用于评估悬停期间沿叶片的压力分布。AH-1G眼镜蛇直升机广泛的气动和气动声学数据调查用于评估前飞过程中不同进退方位角的压力分布。证明了求解器在转子性能方面的预测能力，并且总体上与测量数据非常吻合。