Dynamic Characteristics of a Coaxial Jet–Swirl Injector with External Excitation

Bae, Jun Seok; Kim, Taesung; Jeong, Seokgyu; Jeong, Changyeong; Koo, Jaye; Yoon, Youngbin

doi:10.1007/s42405-018-0064-9

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…Among many components, fuel spray is considered to play an important role in combustion instability. 5,6 While spray dynamics and breakup have been analyzed extensively, [7][8][9][10][11][12][13] over a wide range of conditions, however, the physics of fuel sprays are as yet generally considered to be poorly understood. The common range of oscillation in combustor pressure is from 10% to 20%.…”

Section: Introductionmentioning

confidence: 99%

Effect of ambient pressure oscillation on the primary breakup of cylindrical liquid jet spray

Zhang

Shin

2020

International Journal of Spray and Combustion Dynamics

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The present simulation study investigates the effects of ambient pressure oscillation on cylindrical liquid jet sprays, using the volume of fluid method. The research is motivated by combustion instability in combustion engines, where strong harmonic pressure oscillation can damage internal structures. Oscillating pressure modulates not only the fuel mass flow rate but also the ambient gas density and liquid surface tension, and in liquid sprays, the ambient fluid density and surface tension can have substantial effects on spray breakup. In order to investigate the multiple property changes with ambient pressure oscillation, therefore, a new solver in OpenFOAM is developed. In the solver, liquid mass flow rate, ambient gas density, and liquid surface tension change simultaneously as a result of pressure oscillation. Simulations were conducted at a Reynolds number of 2000 and Weber number over 2000, conditions that are conducive to primary breakup in laminar flows. The simulations show that oscillations in ambient pressure significantly strengthen the surface instability of the liquid ligament, which depends on the surface tension–pressure coefficient, the mean pressure, and the amplitude of oscillation.

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Section: Introductionmentioning

confidence: 99%

Effect of ambient pressure oscillation on the primary breakup of cylindrical liquid jet spray

Zhang

Shin

2020

International Journal of Spray and Combustion Dynamics

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Effect of the Flow Passage Area Ratio on a Double Slit-Type Pintle Injector

Lee,

Shim,

Kim

et al. 2024

Int. J. Aeronaut. Space Sci.

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Due to the structural characteristics of the pintle injector, a recirculation zone is generated under the pintle, so the pintle tip is directly exposed to a high-temperature environment. Therefore, the cooling technique and protective coating on the pintle tip are essential for improving the reusability and durability of the pintle injector. Although various cooling methods are known, this study applied a forced flow passage cooling method by adding internal structures called inserts to the pintle injector. The characteristics of the insert were analyzed experimentally and numerically based on change of its area ratio. When the internal flow changes, the spray angle, droplet size, and cooling performance also change in accordance with an increase in the insert’s central area. When the insert structure is installed in the pintle post, upward flow may occur, which can worsen the spray angle and droplet distribution characteristics. Nevertheless, owing to the insert structure, the surface temperature of the pintle post is reduced dramatically as intended. Thus, an optimal design technique for cooling by changing the area ratio of the first- and second-row slits of the pintle post can be suggested to overcome the limitations of the insert structure. The results of this study will be helpful in understanding the spray characteristics of the insert structure and optimize the design of cooling channels for reusable pintle injectors in the future.

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Prediction of combustion instability by combining transfer functions in a model rocket combustor

Wang

Sohn

Bae

et al. 2021

Aerospace Science and Technology

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Dynamic Characteristics of a Coaxial Jet–Swirl Injector with External Excitation

Cited by 3 publications

References 11 publications

Effect of ambient pressure oscillation on the primary breakup of cylindrical liquid jet spray

Effect of ambient pressure oscillation on the primary breakup of cylindrical liquid jet spray

Effect of the Flow Passage Area Ratio on a Double Slit-Type Pintle Injector

Prediction of combustion instability by combining transfer functions in a model rocket combustor

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