Dynamic mode decomposition of the acoustic field in radial compressors
Dynamic mode decomposition of the acoustic field in radial compressors
复制标题
DOI：
10.1016/j.ast.2019.05.015
复制
发表时间：
2019-07
影响因子：
5.6
通讯作者：
A. Broatch;J. García-Tíscar;Ferran Roig;Sidharath Sharma
中科院分区：
文献类型：
--
作者：
A. Broatch;J. García-Tíscar;Ferran Roig;Sidharath Sharma
自航空旅行开始以来，噪音降低一直被广泛认为是一个重要问题，如今仍然是航空业所有利益相关者的紧迫问题。虽然航空发动机压气机，特别是在接近阶段，历来被认为是主要的噪声源，但大多数研究都是在轴流式压气机上进行的。然而，径流式压缩机应用广泛：小型公务机、直升机、无人机（UAV）、辅助动力装置（APU）、往复式发动机的涡轮增压器等。由于其几何特性，径流式压缩机的流动模式与轴向压缩机不同，导致不同的声学性能，但也为不同的优化方法打开了大门。然而，经典的模态分解技术集中在管道传播可能无法揭示复杂的几何形状和流动特性之间的相互作用，作为噪声源。在本文中，我们应用，除了经典的方法，数据驱动的动态模式分解（DMD）的压力数据来自分离涡模拟（DES），在其中，我们已经通过实验验证了压缩机的模态行为的正确再现，从而获得深入的细节之间的联系的流动现象和噪声的产生和传输的入口和出口管道。
Widely recognized since the beginning of air travel as a major issue, noise reduction remains nowadays a pressing concern for all stakeholders in the aviation industry. While aeroengine compressors, specially at the approach phase, have been historically identified as a leading source of noise, most of the research has been conducted on compressors of the axial type. However, radial compressors are found in a wide array of applications: smaller business jets, helicopters, unmanned aerial vehicles (UAVs), auxiliary power units (APUs), turbochargers for reciprocating engines, etc. Owing to their geometrical particularities, radial compressors feature flow patterns that differ from their axial counterparts, leading to different acoustic performance but also opening the door for different optimization approaches. Yet, classical modal decomposition techniques focused on duct propagation may fail to reveal the complex interactions between geometry and flow features that act as noise sources. In this paper we apply, in addition to the classical approach, a data-driven Dynamic Mode Decomposition (DMD) to pressure data coming from a Detached Eddy Simulation (DES), in which we have experimentally validated the correct reproduction of the modal behaviour of the compressor, thus obtaining in-depth details of the link between flow phenomena and noise generation and transmission across the inlet and outlet ducts.