Spatiotemporal Characterization and Modeling of Supersonic Inlet Buzz with Proper Orthogonal Decomposition Method

Ke Dai , Wen-Jiang Xu , Jian Teng , Jian-Feng Zhu , Yan-Cheng You

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018_1780869

In this paper, buzz phenomenon of a typical supersonic inlet is analyzed using unsteady RANS simulation and proper orthogonal decomposition (POD) method. The numerical results are first compared with previous experimental data and achieve good agreement, in terms of pressure oscillation frequency within the inlet. Then, dominant flow patterns and characteristics of the buzzed flow are obtained by decoupling the computed pressure field into spatial and temporal sub-parts using the POD method. On the basis of POD results, a one-dimensional (1D) model, which approximates the original flow field, is proposed by taking into account only the first-order POD mode. The resulted mathematical model is used to describe the spatiotemporal pressure oscillation features. Finally, the standard deviation of the unsteady pressure field from both numerical simulation and model prediction are compared. Limited discrepancy can be observed and the good agreement validates the credibility of the proposed 1D model. Therefore, the supersonic inlet buzz phenomenon studied in this work can be approximated as a product of decoupled temporal and spatial terms. It is believed that the model proposed here can serve as a good candidate for quick and onboard analysis of the complicated inlet buzz phenomenon.

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HiSST 2018, Modeling, POD, Spatiotemporal characterization, Supersonic inlet buzz

In Categories: HiSST 2018, Hypersonic Aerodynamics, Hypersonic Flight Dynamics, Hypersonic Propulsion, Materials and Structures, Propulsion Systems and Components

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