Flow visualization of cryogenic spray from a movable pintle injector

Lee, Keonwoong; Shin, Dongsoo; Son, Min; Moon, Heejang; Koo, Jaye

doi:10.1007/s12650-019-00548-7

Cited by 15 publications

(1 citation statement)

References 8 publications

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“…Accordingly, fundamental research on the spray characteristics of the pintle injector plays an important role. In order to establish the optimization design procedure of the variable-area pintle injector under all throttling conditions, a research group mainly from Korea Aerospace University and Seoul National University conducted a large amount of original work for parameter sensitivity analysis [13][14][15][16]. Both Zhang et al [17] and Zhou et al [18] researched the gas-liquid pintle injector by means of experimental and numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Effect of Local Momentum Ratio on Spray Windward Distribution of a Gas–Liquid Pintle Injector Element

et al. 2022

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The variable-area pintle injector has unique geometry and spray characteristics compared to traditional coaxial injectors, and is advantageous for weight lightening and deep throttling of liquid rocket engines. To obtain an accurate prediction of the spray windward distribution of a gas–liquid pintle injector with discrete radial orifices, a pintle injector element using air and water as simulants was designed for spray experiments in the atmospheric environment. The air-film injection pressure drop and water-jet injection orifice diameter were both adjusted for a wide variance range from 0.19 to 2.85 for the local momentum ratio. Backlight imaging was adopted for shooting the frozen spray pattern from one side, and a new dimensionless parameter, i.e., the spray fraction, was defined to quantitatively analyze the time-averaged windward boundary band. The dimensionless spray windward boundary band model for a circular-orifice jet and the corresponding derivative formula of the spray half angle were summarized through parameter study. The predicted results of empirical models were in good agreement with the experimental results. It was found that when the local momentum ratio was about 1, the spray distribution range basically overlapped with the coverage scope of gas film with uniform liquid mist.

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