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首页> 外文期刊>The Open Acoustics Journal >Adaptive BEM for Low Noise Propeller Design
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Adaptive BEM for Low Noise Propeller Design

机译:适用于低噪声螺旋桨设计的自适应BEM

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A potential-based Boundary Element Method is presented for the aerodynamic and acoustic design of propellersat on- and off-design point conditions. Using an adaptive method, a family of airfoil sections is selected to producethe required performance (thrust, torque and efficiency versus advance ratio) at different cruise flight levels. Climb conditionsare also considered in order to check the off-design point performance. Once the available airfoil data have beenstored in a database, the code processes the families of airfoils to generate a complete geometry for a propeller of thespecified performance with an optimized noise emission. The computational scheme adjusts the blade geometry (radialdistribution of chord, local sweep angle and thickness) under the control of an optimization routine. The geometric dataand pressure distribution are then used in the acoustic calculation, based on the Ffowcs Williams-Hawkings equation. Resultsare presented demonstrating the application of the technique and the resulting aerodynamic performance and noiseoutput.
机译:提出了一种基于势能的边界元方法,用于在设计点和设计点条件下螺旋桨的空气动力学和声学设计。使用自适应方法,选择了一系列翼型截面,以在不同的巡航飞行水平下产生所需的性能(推力,扭矩和效率与超前比)。为了检查偏离设计点的性能,还考虑了爬升条件。一旦将可用的机翼数据存储在数据库中,代码便会处理机翼族,以生成具有特定性能的螺旋桨的完整几何形状,并优化噪声。该计算方案在优化程序的控制下调整叶片的几何形状(弦的径向分布,局部后掠角和厚度)。然后,根据Ffowcs Williams-Hawkings方程将几何数据和压力分布用于声学计算。结果表明了该技术的应用以及由此产生的空气动力学性能和噪声输出。

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