Abstract
A scaling method to examine combustion-stability characteristics of a coaxial injector is devised based on the acoustics and combustion dynamics in a chamber. The method is required for a subscale test of stability rating with a model chamber, which is cost-effective compared with an actual full-scale test. First, scaling and similarity rules are considered for stability rating and thereby, three conditions of acoustic, hydrodynamic, and flame-condition similarities are proposed. That is, for acoustic similarity, the natural or resonant frequencies in the actual chamber should be maintained in the model chamber. And, two parameters of density ratio and velocity ratio are derived for the requirement of hydrodynamic and flame-condition similarities between the actual and the model conditions. Next, one example of an actual combustion chamber with high performance is selected and the proposed scaling method is applied to the chamber for understanding of the method. The design operating condition for a model test is presented by mass flow rates of propellants. Stability boundaries can be identified on the coordinate plane of chamber pressure and mixture ratio of fuel and oxidizer by applying the scaling method.
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Recommended by Associate Editor Oh Chae Kwon
Chae Hoon Sohn received his B.S., M.S., and Ph.D in Mechanical Engineering from Seoul National University, Korea, in 1992, 1994, and 1998, respectively. He worked at Korea Aerospace Research Institute and Chosun University in 1999 to 2007. He is currently a professor in Department of Mechanical Engineering at Sejong University in Seoul, Korea. His research interests are in the area of combustion, rocket propulsion, and acoustics.
Young Jun Kim received his B.S. in Aerospace Engineering from Chosun University, Gwangju, Korea in 2010. He is currently a graduate student in Department of Mechanical Engineering at Sejong University, Seoul, Korea in 2012. His research interests are in combustion and rocket propulsion.
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Sohn, C.H., Kim, Y.J., Kim, YM. et al. A scaling method for combustion stability rating of coaxial gas-liquid injectors in a subscale chamber. J Mech Sci Technol 26, 3691–3699 (2012). https://doi.org/10.1007/s12206-012-0843-3
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DOI: https://doi.org/10.1007/s12206-012-0843-3