Investigation of supersonic isobaric submerged turbulent jets

Turbulent supersonic submerged airjets have been investigated on the Mach number interval Ma= 1.5-3.4 and on the interval of ratios of the total enthalpies in the external medium and the jet i0= 0.01-1. Oxyhydrogen jets with oxidizer ratios α= 0.3-5 flowing from a nozzle at Mach numbers Ma= 1 and 2,4 have also been investigated. The jet can be divided into two parts: an initial part and a main part. The initial part extends from the nozzle exit to the section x′, the main part of the jet extends downstream from the section x′. It is shown that in the main part of the jet the parameters on the flow axis - the dimensionless velocity and temperature - vary in inverse proportion to the distance, measured in units of length x′, and do not depend on the flow characteristics which determine the initial part of the jet. The angles of expansion of the viscous turbulent mixing layer in the submerged heated or burning jet increase with decrease in i0 and Ma and are practically independent of the afterburning process.