Fluid-Structure-Acoustic Interaction of Enclosed Radial Fans

封闭式径流风扇的流固声相互作用

• 批准号: 468338100
• 负责人: Professor Dr.-Ing. Stefan Becker
• 金额: --
• 依托单位: Lehrstuhl für Strömungsmechanik (LSTM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/468338100?language=en
• 关键词: Fluid; Structure; Acoustic; Interaction; Enclosed

The research project comprises the acoustics of a radial fan operated in a spiral housing. Radial fans have a wide range of applications in a wide variety of fluid engineering applications, in which the requirements for sound radiation are becoming increasingly dominant.The goal of the present application is to investigate the multiphysical interrelationships of flow-related sound radiation of radial fans in volute casings using a combined, experimental, simulation-based approach. It is important to treat the excitation paths for the casing structure separately: There are the fluid dynamic pressure fluctuations as well as the flow induced acoustic pressure field within the casing. The numerical simulation methods are verified and validated against experimentally obtained data. Subsequently, developed methods are used to investigate the sound generation in the fan impeller and the resulting sound radiation through the spiral housing. This is done by means of variant studies. The variants are formed by different inflow conditions to the radial impeller, which influence the flow-induced sound generation in the impeller and thus also the casing excitation and sound radiation into the far field.The innovation of the research work results from the fact that for the first time it is possible to develop a simulation method for enclosed rotating systems, which maps the entire chain of fluid-structure-acoustic interaction. In a complementary approach with experimental investigations, a conscious separation of different mechanisms in sound generation and their complex interactions results in knowledge with a high general validity that is not yet available in literature for enclosed radial fans. The findings allow conclusions to be drawn as to which part of the machine (impeller flow, casing structure, etc.) changes the radiated sound with which influencing parameters. In the development process, this results in a specific treatment of the acoustic problem areas. The basic-oriented investigations have a high general validity and form the basis of future design rules for noise-reduced radial fans. The coupled simulation method provides a calculation tool that allows the flow-induced sound generation and its propagation in radial impellers to be analyzed in the frequency and time domain. Future work will focus on the use of optimization algorithms for noise reduction, which consider not only the inflow conditions to the impeller and their interaction with the leading edge of the blade, but also the material parameters and the shape of the casing structure.

该研究项目包括在螺旋外壳中运行的径流式风扇的声学特性。径流式风扇在各种流体工程应用中有着广泛的应用，其中对声辐射的要求越来越占主导地位。本申请的目标是研究径流式风扇与流动相关的声辐射的多物理相互关系使用基于实验和模拟的组合方法在蜗壳中进行研究。单独处理套管结构的激励路径很重要：套管内存在流体动压波动以及流动引起的声压场。数值模拟方法根据实验获得的数据进行了验证和验证。随后，开发的方法用于研究风扇叶轮中的声音产生以及由此产生的通过螺旋外壳的声音辐射。这是通过变异研究来完成的。这些变体是由径向叶轮的不同流入条件形成的，这影响了叶轮中的流致声的产生，从而影响了壳体激励和声辐射到远场。该研究工作的创新性源于以下事实：第一次可以开发一种封闭旋转系统的模拟方法，该方法可以绘制流体-结构-声学相互作用的整个链。在与实验研究的补充方法中，有意识地分离声音产生的不同机制及其复杂的相互作用，产生了具有高度普遍有效性的知识，而这在封闭式径向风扇的文献中尚不存在。这些发现可以得出关于机器的哪个部分（叶轮流量、壳体结构等）改变辐射声音以及影响参数的结论。在开发过程中，这导致了对声学问题区域的特殊处理。面向基础的研究具有较高的普遍有效性，并构成未来降噪径流式风扇设计规则的基础。耦合仿真方法提供了一种计算工具，可以在频域和时域中分析径向叶轮中流致声的产生及其传播。未来的工作将集中于使用优化算法进行降噪，该算法不仅考虑叶轮的流入条件及其与叶片前缘的相互作用，还考虑材料参数和壳体结构的形状。