The effect of the initial swirl of the supersonic flow of humid air on the adiabatic wall temperature

The paper presents the results of measuring the adiabatic wall temperature of an axisymmetric channel during acceleration of the moist air flow in it to supersonic speed. The initial swirl was imparted to the flow (swirling parameter S = 0.5, 1.0, 2.5). The relative initial humidity (RH) of the flow varied in the range of 10 ÷ 90%. When the flow was accelerated to supersonic speeds, part of the moisture condensed, which influenced the wall temperature. It is shown experimentally that with an increase in the initial moisture content of the flow to certain values, the distribution of the wall temperature for a flow without initial swirl (S = 0) and with swirl with S = 0.5, 1.0 practically coincide. However, from a certain value of RH, the wall temperature in the case of a swirling flow decreases in comparison with a flow without swirling. The maximum decrease in the wall temperature was achieved at RH = 90%. An increase in the initial swirl to S = 2.5 led to a greater decrease in the wall temperature, while the mass air flow through the channel decreased by 26% at an identical pressure drop.

Creating Of Stable Transonic Zone Into Supersonic Flow In Axisymmetrical Channel By The Action Of Jet And Energy Sources

The effect of the jet flowing out from the gas generator through a narrow annular gap, on the shockwave structure of the flow in the axisymmetric channel of variable section is studied. The effect of the gap size is investigated. The possibility to control the shock-wave structure of supersonic flow in the channel and creating of transonic area using pulsed-periodic energy supply and jet is studied.