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- W2979550879 abstract "The work is devoted to experimental study of the structure and acoustic radiation of a supersonic underexpanded jet Ma = 1, Npr = 5 with the presence of vortexgenerators in the form of small-sized jets injections. Ten different configurations were tested, in which following the gas-dynamic and geometrical parameters of the microjets were changed one by one: microjets pressure, the injection distance from the main nozzle section, azimuthal, tangential, and axial angles of micronozzles inclination. The flow visualization, azimuthal Pitot pressure profiles and characteristics of jet noise in the far field were obtained. It has been revealed that the injection of microjets in general leads to an increase in the jet long-range and a decrease in its mixing. The advantageous parameters of the microjets injection for reducing the jet acoustic emission are the injection point vicinity to the main nozzle section, micronozzles inclination to main jet axis and the small tangential angle of micronozzles. The micronozzles quantity effect is non-linearly in relation to the structure and the jet noise. The average pressure measuring distribution near artificial longitudinal vortices in a jet stream cannot predict the characteristics of its mixing and acoustic radiation." @default.
- W2979550879 created "2019-10-18" @default.
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- W2979550879 date "2019-01-01" @default.
- W2979550879 modified "2023-09-23" @default.
- W2979550879 title "Influence of Different Configurations of Microjet Injection on Structure and Acoustic Radiation of Supersonic Jet" @default.
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- W2979550879 doi "https://doi.org/10.25205/2541-9447-2019-14-2-56-76" @default.
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