Abstract
Optical display and measurement of transverse jet flow field under supersonic inflow is performed with continuous xenon lamp color schlieren, strobo light color schlieren and strobo light monochrome schlieren. Characteristic of fuel transverse jet in scramjet combustion chamber is studied. Results indicate that wave structure can be displayed through images obtained from long time exposure of schlieren, exposure time in dozens of nanoseconds is suitable for the display of turbulent structure, and comparing with color schlieren, amounts of information obtained from monochrome schlieren are few, whose sensitivity is much lower, either.
Highlights
Ignition, flame holding and fuel mixing are primary problems in supersonic combustion
Less drag loss is better with fuel jet, and favorable fuel distribution should be formed on cross section of combustion chamber
Study on the characteristic of transverse jet flow under supersonic condition is helpful to the structure designing of combustion chamber, confirming the igniting position and igniting mode of scramjet[2]
Summary
Flame holding and fuel mixing are primary problems in supersonic combustion. When vehicle flights in supersonic/hypersonic speed, velocity of gas entering into the combustion chamber is high, and the retention time is very short, so the promotion of propulsion system performance is restricted. Combustion efficiency of scramjet is directly influenced by transverse jet characteristic of fuel[1]. Study on the characteristic of transverse jet flow under supersonic condition is helpful to the structure designing of combustion chamber, confirming the igniting position and igniting mode of scramjet[2]. For studying the distribution of fuel after it is injected into the combustion chamber and the interaction between fuel and supersonic inflow, optical display and measurement of transverse jet flow field under supersonic inflow is performed with continuous xenon lamp color schlieren, strobo light color schlieren and strobo light monochrome schlieren, so as to choose the appropriate optical display and measurement technique according to different requirements in further study
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