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首页> 外文期刊>Aerospace science and technology >Chimera simulations of multibladed rotors in high-speed forward flight with weak fluid-structure-coupling
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Chimera simulations of multibladed rotors in high-speed forward flight with weak fluid-structure-coupling

机译：薄弱流固耦合的高速前向飞行中多叶片转子的嵌合仿真

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摘要

The state of the art of weak fluid-structure coupling for rotors in forward flight at DLR is presented. The coupling procedure is based on the DLR rotor simulation code S4 and the DLR Navier-Stokes solver for structured grids FLOWer. The method allows trimmed CFD solutions to be produced for rotors in high-speed forward flight with the inclusion of elastic blade deformations and viscous effects. The weak coupling procedure is applied to high-speed forward flight test cases of isolated rotors. 4-bladed rotors are simulated for two cases (7A and 7AD rotor) using the chimera approach. A variation of turbulence models from algebraic to 2-equation models did not show significant differences for these high-speed forward flight test cases with moderate rotor loading. The weak coupling, which includes the transfer of normal forces (c_n), tangential forces (c_t) and pitching moments (c_m) from the CFD code to the rotor simulation code, considerably improved the overall agreement with the existing experimental data compared to the uncoupled computations. The performance difference between the 7A and the 7AD rotor in high-speed forward flight is well predicted.
机译：提出了在DLR前向飞行中用于转子的弱流固耦合技术的现状。耦合过程基于DLR转子仿真代码S4和结构化网格FLOWer的DLR Navier-Stokes解算器。该方法允许在高速向前飞行中为转子产生微调的CFD解决方案，并包括弹性叶片变形和粘性效应。弱耦合程序适用于隔离转子的高速向前飞行测试案例。使用嵌合方法对两种情况（7A和7AD转子）的4叶片转子进行了仿真。湍流模型从代数模型到2方程模型的变化对于这些具有中等转子负载的高速向前飞行测试案例没有显示出显着差异。弱耦合，包括从CFD代码到转子仿真代码的法向力（c_n），切向力（c_t）和俯仰力矩（c_m）的传递，与未耦合相比，大大改善了与现有实验数据的总体一致性计算。可以很好地预测7A和7AD转子在高速向前飞行中的性能差异。

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