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首页> 外文期刊>Shock and vibration >Electrically Controlled Rotor Blade Vortex Interaction Airloads and Noise Analysis Using Viscous Vortex Particle Method
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Electrically Controlled Rotor Blade Vortex Interaction Airloads and Noise Analysis Using Viscous Vortex Particle Method

机译：电控转子叶片涡流相互作用使用粘性涡流颗粒法的空降和噪声分析

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An electrically controlled rotor (ECR), also called a swashplateless rotor, replaces a swashplate with a trailing-edge flap system to implement primary rotor control. To investigate the aerodynamic characteristics of an ECR in blade-vortex interaction (BVI) condition, an analysis model based on the viscous vortex particle method, ECR blade pitch equation, and the Weissinger-L lifting surface model is established. In this model, the ECR wake flow field vorticity is discretized as multiple vortex particles, and the vorticity-velocity form of the Navier-Stokes equation is solved to simulate the transport diffusion of the vorticity. The flap motion-inducing blade-pitch movement is obtained by solving the ECR blade-pitch movement equation via the Runge–Kutta fourth-order method. On the basis, BVI noise radiation of an ECR is evaluated using the Ffowcs Williams and Hawkings (FW-H) equation. Based on the present prediction model, the aerodynamic and acoustic characteristics of a sample ECR in BVI condition are analyzed. The results show that since the BVI event of the ECR on the advancing side is mainly caused by the interaction between the flap tip vortex and the blade, the blade spanwise range of ECR BVI occurrence on the advancing side is smaller than that of the conventional rotor. In addition, the magnitude of the maximum sound pressure level on the advancing side as well as on the retreating side of the ECR is also different from that of the conventional rotor, which is consistent with the difference in the airloads between the ECR and conventional rotor. Furthermore, a study was performed to examine the effect of the pre-index angle on the BVI-induced airloads and noise. The amplitude of the impulsive airloads of the ECR on the advancing side is increased with the increase in pre-index angle, while the amplitude of the impulsive airloads of the ECR on the retreating side is decreased. Indeed, when the pre-index angle of the sample ECR is 8 degrees, the retreating-side noise radiation lobe is almost disappeared. In addition, the different intensity of wake vorticity is the main reason for the differences of the BVI-induced airloads and noise among the ECR with different pre-index angles.
机译：电控转子（ECR），也称为柔软的转子，替换具有后缘襟翼系统的斜盘以实现主转子控制。为了研究叶片 - 涡旋相互作用（BVI）条件中ECR的空气动力学特性，建立了基于粘性涡旋颗粒法，ECR叶片俯仰方程和Weissinger-L提升表面模型的分析模型。在该模型中，ECR唤醒流场涡度被离散化为多个涡旋颗粒，并解决了Navier-Stokes方程的涡流 - 速度形式以模拟涡流的传输扩散。通过通过径流-Kutta四阶方法求解ECR叶片间距移动方程来获得翼片运动诱导的刀片间距移动。在此基础上，使用FFOCS威廉姆斯和霍普林斯（FW-H）方程来评估ECR的BVI噪声辐射。基于本预测模型，分析了BVI条件下样品ECR的空气动力学和声学特性。结果表明，由于ECR对前进侧的ECR的BVI事件主要由襟翼尖端涡流和刀片之间的相互作用引起，因此叶片在前进侧的ECR BVI发生的范围小于传统转子的叶片。另外，前进侧以及ECR的退回侧的最大声压水平的大小也与传统转子的最大声压水平以及与传统转子的差异一致地不同，这与ECR和传统转子之间的空降差相一致。此外，进行研究以检查预指角对BVI引起的空载和噪声的影响。随着预指角的增加，前进侧的ECR的脉冲空间的幅度增加，而退回侧的ECR的脉冲空间的幅度降低。实际上，当样品ECR的预索引角为8度时，后退侧噪声辐射叶几乎消失。此外，唤醒涡度的不同强度是BVI引起的空气载体和ECR之间具有不同预折射率角度的噪声的主要原因。

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