Spray influence on the gas-dynamic structure of a supersonic underexpanded jet
V.M. Boiko, V.V. Lotov, A.Yu. Nesterov, S.V. Poplavski
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: gas-liquid flow, supersonic underexpanded jet, aerodynamic breakup of droplets
Abstract
The goal of the study is to study the gas-dynamic structure of a supersonic underexpanded jet in the presence of a liquid spray as applied to the topic of gas-liquid nozzles. The wave structure is detected by methods of shadowgraphy and adaptive transparency visualization. Laser Doppler anemometry is used to measure the spray velocity and also to determine its concentration and droplet size. It is found that the flow in the two-phase core is qualitatively different from the gas jet flow. The transformation of the Mach disk in a wide range of gas flow regimes and liquid flow rates is studied. A crucial role of the gradient region of the jet in the vicinity of the Mach disk in the process of liquid atomization is demonstrated.
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