The effect of gas compressibility on the liquid jet primary breakup in high-speed air crossflow is numerically investigated. The interface is tracked by coupled Level Set and Volume of Fluid method. The liquid region is resolved by incompressible flow solver, and the gas flow is simulated by compressible flow solver. The primary breakup of liquid jet in both subsonic and supersonic crossflow is simulated, with the same Weber number and liquid/gas momentum flux ratio. Different breakup morphology are numerically predicted at different Mach numbers.
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