针栓式喷注单元雾化角模型分析

doi:10.7527/S1000-6893.2019.23622

Abstract

Abstract: In order to accurately predict the spray angle of pintle injector of different radial orifice shapes, the theoretical models of the spray angles of one liquid sheet impinging on another liquid sheet and a liquid sheet impinging on a liquid jet are modified based on the momentum conservation equation. For the injection unit of one liquid sheet impacting another liquid sheet, two deformation factors are introduced in the model by theoretical derivation, which associates the geometric deformation effect of the impact with spray angle. For a liquid sheet impact a liquid jet, the effective impinging momentum ratio is defined by introducing the blocking rate. At the same time, the influence of the inlet hole shape of the liquid jet is implicitly considered in the deformation factors. Finally, according to the results of high-speed photography test and the numerical simulation results, the corresponding combination coefficients of deformation factors are obtained, which makes the new spray angle model more adaptable and more accurate than the original model. The results show that the predicted values of the theoretical model with the introduction of deformation factors and blocking rate are in good agreement with the experimental and numerical simulation results. For one liquid sheet impinging on another liquid sheet, the deformation factors are basically maintained at 0.9~1.1, and the recommended values of the deformation factors are C₁=0.99 and C₂=1.06, according to the experimental results and simulation results. For a liquid sheet impinging on a liquid jet, the recommended values of the deformation factor are C₁=0.75 and C₂=1.25. This model calculates the spray angle according to the actual axial momentum and the actual synthetic total momentum at the exit, which implicitly considers the influence of the impact effect. Compared with the common model that calculates the spray angle based on the axial momentum and the synthetic total momentum at the entrance before the impact, the accuracy of the new model is significantly improved, which provides an important reference for the theoretical research and engineering design of pintle injectors.

Key words: injector, spray angle model, deformation factor, blocking rate, effective impinging momentum ratio

CLC Number:

V434.3

WANG Kai, LEI Fanpei, ZHANG Botao, YANG Anlong, ZHOU Lixin. Analysis on spray angle model for pintle injector element[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(10): 123622-123622.

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Analysis on spray angle model for pintle injector element

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