Xuan Jin

China Aerodynamics Research and Development Center

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Chibing Shen

National University of Defense Technology

Rui Zhou

National University of Defense Technology

Xianyu Wu

National University of Defense Technology

Zhongpei Zhang

University of Electronic Science and Technology of China

Chongzhi Liu

Xi'an Jiaotong University

Yang Yang

Southwest Jiaotong University

Chao Zhu

Shanghai Medical Information Center

Sen Lin

Hunan University

Dejiang Chen

China Aerodynamics Research and Development Center

Xinxin Fang

Chongqing University

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China Aerodynamics Research and Development Center

National University of Defense Technology

University of Shanghai for Science and Technology

Chongqing University

University of Electronic Science and Technology of China

Tongji University

Xi'an University of Architecture and Technology

Northwestern Polytechnical University

University of Chinese Academy of Sciences

Beihang University

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

Aerospace (2022)

Xuan Jin Yang Yang Xiaomei Cao Jinshui Wu

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.

Dimensionless quantity

Spray characteristics

Diffuser (optics)

Secondary air injection

Momentum (technical analysis)

10.3390/aerospace9090494

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