An experimental and numerical investigation of spray atomization in liquid-propellant rocket engines

Gülmez, Senem
Since the liquid rocket engines have been widely used in various flight applications, improving the efficiency and stability of those engines have become important. To achieve efficient combustion in the chamber, the injector must be carefully designed and characterized well. Although impinging jet injectors are widely used in several systems, the previous researches focused on mainly the characterization of like-doublets, thus, there is still a lack of understanding on the atomization of the other types of impinging injectors. In this study, triplet and pentad type of impinging injectors are examined both experimentally and numerically. Parameters that affect the spray distribution, velocity and droplet statistics are analyzed and a group of injectors for both injector elements are tested with a mechanical patternator, a PDA, and a high-speed camera. It is seen that while some parameters enhance the results obtained by triplet injectors, they either deteriorate the results obtained by pentad injectors or do not have an obvious effect. For numerical results, a CLSVOF technique with the AMR method is used to simulate the spray characteristics of doublet, triplet and pentad injectors. Results indicate that this numerical method can be used to analyze the performance of these injectors with a reasonable accuracy compared to experimental data.


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Citation Formats
S. Gülmez, “An experimental and numerical investigation of spray atomization in liquid-propellant rocket engines,” M.S. - Master of Science, Middle East Technical University, 2021.