Experiments on Supersonic Boundary Layer Laminarization by Means of Foreign-Gas Injection
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Experimental investigation of the influence of the distributed heavy gas (sulfur hexafluoride, SF6) injection into the near-wall sub-layer of a boundary layer) on the hydrodynamic stability in relation to controlled disturbances of the supersonic flat-plate boundary-layer at free-stream Mach number M = 2 have been performed. It was for the first time in controlled experiments obtained that injection of this foreign gas leads to the boundary-layer stabilization that is manifested in reduction of disturbance amplification rates. Good quantitative agreement of collected experimental data with computations based on the linear stability theory is obtained.
Keywords
supersonic boundary layer, hydrodynamic stability, laminar-turbulent transition, permeable coatings, injection, binary gas mixture
Funding
The research was carried out within the framework of the Program of Fundamental Scientific Research of Russian state academies of sciences in 2013–2020 (project АААА-А17-117030610125-7, no. 0323-2018-0009) and was also supported by Russian Foundation for Basic Research (project no. 18-01-00070а)
УДК 532.526
Experiments on Supersonic Boundary Layer Laminarization by Means of Foreign-Gas Injection
0000-0003-0209-6299 The material was received by the Editorial Board: 30.05.2019
Abstract Experimental investigation of the influence of the distributed heavy gas (sulfur hexafluoride, SF6) injection into the near-wall sub-layer of a boundary layer) on the hydrodynamic stability in relation to controlled disturbances of the supersonic flat-plate boundary-layer at free-stream Mach number M = 2 have been performed. It was for the first time in controlled experiments obtained that injection of this foreign gas leads to the boundary-layer stabilization that is manifested in reduction of disturbance amplification rates. Good quantitative agreement of collected experimental data with computations based on the linear stability theory is obtained.
Keywords
supersonic boundary layer, hydrodynamic stability, laminar-turbulent transition, permeable coatings, injection, binary gas mixture
Funding
The research was carried out within the framework of the Program of Fundamental Scientific Research of Russian state academies of sciences in 2013–2020 (project АААА-А17-117030610125-7, no. 0323-2018-0009) and was also supported by Russian Foundation for Basic Research (project no. 18-01-00070а)
УДК 532.526
Experiments on Supersonic Boundary Layer Laminarization by Means of Foreign-Gas Injection References: Lysenko V. I., Smorodsky B. V., Yermolaev Yu. G., Yatskih A. А., Kosinov A. D. Experiments on Supersonic Boundary Layer Laminarization by Means of Foreign-Gas Injection . Siberian Journal of Physics . 2019, vol. 15, no. 3. P. 26–38. (in Russ.). DOI: 10.25205/2541-9447-2019-14-3-26-38