Supersonic Flow past a Flat Lattice of Cylindrical Rodsстатья
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Дата последнего поиска статьи во внешних источниках: 26 августа 2016 г.
Аннотация:A multiblock numerical technique was used to compute the supersonic flow past a flat lattice of cylindrical rods of finite or infinite length. Aperiodic collective flow regimes for a closely spaced lattice and periodic flow regimes for a widely spaced lattice were reproduced. In the latter case, the lattice can be treated as infinite. Two new types of hysteresis in the flow past a lattice of cylindrical rods were detected. One is related to the reconstruction of the collective flow over the lattice elements. This hysteresis is associated with the well-known phenomena of flow ambiguity at the start of a supersonic air intake system. The other type of hysteresis is related to the reconstruction of the near wake behind the cylindrical elements caused by the interaction with local bow shocks detached from neighboring lattice elements. The third possible type of hysteresis is associated with the transition from Mach to regular intersection of shocks detached from neighboring cylinders (see [8]). Hysteresis of this type is observed in more widely spaced lattices than those considered in this paper. The influence of aerodynamic interference on the drag coefficient of the cylinders in supersonic lattice flow was investigated. It was found that the drag on the cylinders changes sharply when the lattice flow regimes A and B are reconstructed. This is explained by the influence exerted by the shocks formed ahead of the lattice elements on the near wake of neighboring elements.The computations were performed on the MBC-100K supercomputer at the Joint Supercomputer Center of the Russian Academy of Sciences.This work was supported by the Russian Foundation for Basic Research, project no. 15-01-99623.