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Detached eddy simulation of weapons bay flows and store separation

机译：武器舱流动和存储分离的分离涡流模拟

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When internal weapons bay is exposed to free-stream, highly unsteady flow-field is formed over and inside the bay. The pressure fluctuation may cause damages on the surrounding structures, and increases noise. The complicated aerodynamic characteristics inside the weapons bay also affect the behavior of the stores released from the weapons bay. In the present study, numerical investigations of the unsteady flow-fields inside a weapons bay were conducted by using a three-dimensional compressible flow solver based on unstructured meshes. The effects of fluctuating flow inside the cavity on the aerodynamic loads of the store were also studied. Then simulations of the stores separating from the cavity were carried out, and the effect of flow unsteadiness on the store trajectory was examined. Finally, steady blowing was applied to suppress the pressure fluctuation and to help stabilizing the store separation. It was shown that flow unsteadiness inside the cavity is mainly caused by the detaching and reattaching process of the shear layer. It was found that the results of the SST-DES simulation are in better agreement with experiment in predicting high frequency flow contents than those of the k-omega SST turbulence model. When the store is located inside the cavity or at the shear layer, the pressure on the store oscillates in time. As a result, the trajectory of the store during the initial separation stage is significantly affected depending on the release point in time. It was demonstrated that steady blowing is an effective mean for mitigating the pressure fluctuation and stabilizing the store separation. (C) 2015 Elsevier Ltd. All rights reserved.
机译：当内部武器舱暴露于自由流中时，在托架内部和内部会形成高度不稳定的流场。压力波动可能会损坏周围的结构并增加噪音。武器舱内部复杂的空气动力学特性也会影响从武器舱释放的仓库的行为。在本研究中，通过使用基于非结构化网格的三维可压缩流求解器，对武器舱内非定常流场进行了数值研究。还研究了空腔内部流量的波动对存储的空气动力学负载的影响。然后模拟了从空腔中分离出来的物料，并研究了流动不稳定对物料轨迹的影响。最后，进行稳定吹气以抑制压力波动并帮助稳定物料分离。结果表明，模腔内部的流动不稳定主要是由于剪切层的脱离和再附着过程引起的。研究发现，与k-omega SST湍流模型相比，SST-DES模拟的结果与预测高频流量含量的实验更加吻合。当储存器位于型腔内部或位于剪切层时，储存器上的压力会随时间波动。结果，取决于释放时间点，在初始分离阶段期间储存库的轨迹受到显着影响。事实证明，稳定吹气是减轻压力波动和稳定物料分离的有效手段。 （C）2015 Elsevier Ltd.保留所有权利。

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