针栓式喷注单元膜束撞击雾化混合过程数值模拟

doi:10.7527/S1000-6893.2020.23802

Abstract

Abstract: To fully understand the spray field structure of pintle injectors, this study simulate and analyze the spray and mixing process of impingement between a liquid sheet and a liquid jet in a pintle injector element, based on the adaptive mesh refinement technology and PLIC VOF (Piecewise Linear Interface Calculation Volume of Fluid) method in which three phases are separately calculated. The detailed structural characteristics are obtained in the impinging and atomizing mixing process by tracking the phase interfaces of the two propellants respectively. These characteristics are compared qualitatively and quantitatively with the results of the high-speed photography test, showing good agreement, and verifying the accuracy of the numerical method. Furthermore, the spray field structure, the impact deformation process, the vortex structure, the typical characteristics of spray and breakup, and the distribution characteristics of spray and mixing are identified and analyzed. Results show that two different spray fan structures are formed, namely, the jet not penetrating the liquid sheet and the jet penetrating the liquid sheet. The spray fan formed by the impingement is in the shape of "Ω", with the bending deformation and the cross-sectional deformation occurring simultaneously for both the liquid sheet and liquid jet. In addition, the impingement is simultaneously subjected to positive pressure and shear stress, resulting in a series of complex vortex phenomena, and consequently enhancing the interaction and the spray and mixing process. This is also the essential reason why the injection configuration of the impingement between a sheet and a jet is superior to that between two sheets. Finally, it is also discovered that the droplet distribution in the spray field is characterized by the regional structures, namely, the upper spray zone dominated by the liquid jet, the lower spray zone dominated by the liquid sheet, and the mixing zone sandwiched in between. The spray characteristics and mixing characteristics should be considered comprehensively in practice, and the middle momentum ratio should be selected to provide important reference for theoretical research and engineering design of pintle injectors.

Key words: pintle injector element, liquid sheet impact liquid jet, impact and deformation, spray fan, vortex structure, spray and mixing, adaptive mesh refinement

CLC Number:

V434.3

WANG Kai, LEI Fanpei, YANG Anlong, YANG Baoe, ZHOU Lixin. Numerical simulation of spray and mixing process of impingement between sheet and jet in pintle injector element[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(9): 123802-123802.

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Numerical simulation of spray and mixing process of impingement between sheet and jet in pintle injector element

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