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Experimental Study on the Combustion and Microexplosion of Freely Falling Gelled Unsymmetrical Dimethylhydrazine (UDMH) Fuel Droplets

Author

Listed:
  • Zejun Liu

    (College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China)

  • Xiaoping Hu

    (College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China)

  • Zhen He

    (College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China)

  • Jianjun Wu

    (College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China)

Abstract

The increasing demand for high energy density fuels and the concern for their safety have propelled research in the field of gelled propellants, where understanding the combustion of single gelled fuel droplets is the first stage to predict the spray combustion characteristics. The experiments utilized single-isolated freely falling gelled unsymmetrical dimethylhydrazine (UDMH) droplets instead of the conventional suspended droplet approach, in order to eliminate the perturbation associated with the suspension mechanism. Morphological transformations of the gelled droplet involved in the combustion processes were monitored by employing a high-speed digital camera, while the effects of ambient pressure and oxygen concentration on burning rate constants were also studied. The experimental results show that four main phenomena (droplet deformation, bubble formation and growth, vapor jetting and luminous jetting flame with “horn” shape) and three distinct phases were identified in the droplet combustion process; the high yield stress and polymer chain structure of polymer gellant are responsible for the appearance of bubbles with almost the same order of magnitude as the droplets. Increasing the ambient pressure can increase the burning rate, postpone the appearance of microexplosions, and weaken microexplosion intensity; while increasing the ambient oxygen concentration can promote the appearance of microexplosions, strengthen microexplosion intensity and increase the burning rate.

Suggested Citation

  • Zejun Liu & Xiaoping Hu & Zhen He & Jianjun Wu, 2012. "Experimental Study on the Combustion and Microexplosion of Freely Falling Gelled Unsymmetrical Dimethylhydrazine (UDMH) Fuel Droplets," Energies, MDPI, vol. 5(8), pages 1-11, August.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:8:p:3126-3136:d:19534
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    Citations

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    Cited by:

    1. Donggi Lee & Jonghan Won & Seung Wook Baek & Hyemin Kim, 2018. "Autoignition Behavior of an Ethanol-Methylcellulose Gel Droplet in a Hot Environment," Energies, MDPI, vol. 11(8), pages 1-11, August.
    2. Jin Wu & Frederick Nii Ofei Bruce & Xin Bai & Xuan Ren & Yang Li, 2023. "Insights into the Reaction Kinetics of Hydrazine-Based Fuels: A Comprehensive Review of Theoretical and Experimental Methods," Energies, MDPI, vol. 16(16), pages 1-23, August.
    3. Dmitrii V. Antonov & Roman M. Fedorenko & Leonid S. Yanovskiy & Pavel A. Strizhak, 2023. "Physical and Mathematical Models of Micro-Explosions: Achievements and Directions of Improvement," Energies, MDPI, vol. 16(16), pages 1-16, August.
    4. Dmitrii V. Antonov & Roman M. Fedorenko & Pavel A. Strizhak, 2022. "Micro-Explosion Phenomenon: Conditions and Benefits," Energies, MDPI, vol. 15(20), pages 1-19, October.
    5. Zejun Liu & Jianjun Wu & He Zhen & Xiaoping Hu, 2013. "Numerical Simulation on Head-On Binary Collision of Gel Propellant Droplets," Energies, MDPI, vol. 6(1), pages 1-16, January.
    6. Mhadi A. Ismael & Morgan R. Heikal & A. Rashid A. Aziz & Cyril Crua, 2018. "The Effect of Fuel Injection Equipment of Water-In-Diesel Emulsions on Micro-Explosion Behaviour," Energies, MDPI, vol. 11(7), pages 1-13, June.
    7. Olga Gaidukova & Pavel Strizhak, 2021. "Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes," Energies, MDPI, vol. 14(21), pages 1-16, October.

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