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TsAGI Science Journal

ISSN Druckformat: 1948-2590
ISSN Online: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.v41.i2.90
pages 207-215

SIMULATION OF SELF-OSCILLATORY INTERACTION OF THE SONIC UNDEREXPANDED JET WITH AN OBSTACLE

O. V. Bocharova
Moscow State University, Leninskie Gory, MSU, 1, Bldg. 52, Moscow, 119991

ABSTRAKT

The present article is aimed at the numerical simulation of the interaction of sonic underexpanded jets with different obstacles (flat and hollow). Used for the calculations is the S. K. Godunov method on detailed grids. The emergence of self-oscillatory regimes at certain locations of the obstacles is studied. The spectral characteristics of the revealed self-oscillatory processes are considered. The results obtained are in good agreement with the experimental data by the flow characteristics in the free jet, by the pulsation frequency and amplitude in the self-oscillatory regime of the interaction with an obstacle, as well as by the boundaries of the key parameter ranges, within which the self-oscillations take place. The unsteady flow fields were analyzed to select the main qualitative peculiarities of the studied phenomenon. The possible mechanisms of the self-oscillation appearance are discussed. The possible feedback loop emergence from the external acoustic field and its role in the self-oscillation excitation are investigated. It is noted that the results obtained do not reveal such effect.

SCHLÜSSELWÖRTER: acoustics, self-oscillations, jet

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