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Abstract

In the present study, the atomization of a coaxial injector in the liquid/gas engine combustor was numerically investigated. Based on the wave instability analysis of the interface between liquid and gas, an atomization model for the high-speed liquid jets was established by coupling with the jet flow solutions. First, the wave instability was analyzed to predict the growth rates along the liquid jet surface by numerically solving the wave dispersion equation, while the governing equations of the liquid flow were solved for the formation of the liquid jet core and the variation of the liquid flow structure. Then, these two solutions were coupled in the atomization model to predict drop size distribution and breakup rate. In the present study, the coaxial injection combustion model (CICM) code, which was based on the experimental data for a coaxial injector in the space shuttle main engine (SSME), was used to verify the coupled model. The LOX/GH2 coaxial injector of the SSME preburner was considered as the verification case. The present atomization analyses for the case are in good agreement with the results of the CICM code.

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