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A characterization of the spray evolution by dual-mode phase doppler anemometry in an injector of liquid-propellant thruster

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Abstract

Spray characteristics of an injector employed in the 5 Newton-class of liquid-propellant thruster are addressed with an evolutionary feature of droplets. Information for the droplets is obtained through Dual-mode phase Doppler anemometry (DPDA) measurement in terms of the velocity, diameter, number density, and turbulent intensity. In addition, instantaneous images for the macroscopic view of spray are supplemented by flow visualization technique using laser sheet. It is demonstrated by the investigation of spray images that the injector under consideration meets an angular injection requirement at all of the injection pressures specified. Spray shedding is also featured with a schematization of the frozen images. Dynamic behavior of spray droplets and their atomization evolution along the geometric axis of injector-nozzle orifice with varying injection pressures are scrutinized by depicting the cumulative droplet populations mapped onto a velocity-diameter domain. The evolutionary behavior is further authenticated on the basis of the distribution for number density and turbulent intensity of droplets. It is inferred that the higher injection pressure generates the smaller droplets undergoing the greater deceleration along the spray stream due to the augmented Reynolds number and Weber number. Even though spray characterization of the current type of injectors is to be inevitable to their performance estimation at the design stage, it has never been reported to date. It is expected that the present results will be able to contribute to the appreciation of injector performance and to the design engineering of brand-new thrusters as well.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sunchon National University, Maegok 315, Suncheon, Jeonnam, 540-742, Korea

    Jin Seok Kim

  2. School of Mechanical Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Busan, 608-739, Korea

    Jeong Soo Kim

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  1. Jin Seok Kim
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  2. Jeong Soo Kim
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Correspondence to Jeong Soo Kim.

Additional information

This paper was recommended for publication in revised form by Associate Editor Jun Sang Park

Jin Seok Kim obtained his B.S. and M.S. degrees in Mechanical Engineering in 2005 and 2007, respectively, from Sunchon National University, Korea. He is currently a Ph.D. candidate.

Jeong Soo Kim took his master’s and Ph.D. degrees in Aerospace Engineering in 1987 and 1992, respectively from KAIST, Korea. Since then, he worked for Agency for Defense Development and Korea Aerospace Research Institute as a principal researcher up to 2004. Also he researched at TRW (USA) as an assistant program manager from 1996 to 1998. He is currently a faculty member in the School of Mechanical Engineering of Pukyong National University, Korea. His research fields extend into the development of space propulsion engines with their components design, T&E of liquid rocket engines, and the numerical simulation of combustion phenomena.

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Kim, J.S., Kim, J.S. A characterization of the spray evolution by dual-mode phase doppler anemometry in an injector of liquid-propellant thruster. J Mech Sci Technol 23, 1637–1649 (2009). https://doi.org/10.1007/s12206-009-0209-7

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  • DOI: https://doi.org/10.1007/s12206-009-0209-7

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