Effect of fuel-jet injection angle variation on the overall performance of a SCRAMJET engine

In separation control with air-jet vortex generators in supersonic flow, the spacing of the jets in a row array has a crucial effect on the control effectiveness. Previous experimental studies have revealed the overall influence of jet spacing on air-jet vortex generator controlled shock-induced separation zones, focusing mostly on the separation regions. There is, however, a gap in knowledge regarding the mechanisms leading to these changes in control effectiveness, particularly on the interaction between multiple jets and the details of downstream flow evolution. Therefore, the objective of the current study is to provide detailed information on the underlying flow dynamics associated with the injection of a row of spanwise-inclined jets into a supersonic turbulent boundary layer – and in particular the effects of different jet spacings. Four different spacings were studied with large-eddy simulations. In addition, we performed oil-flow and schlieren visualizations of separation control in a 24 $^\circ$ compression–ramp interaction with different jet-spacing configurations to validate and discuss our conclusions regarding the effects of jet/jet interactions on the separation-control effectiveness. We analyse the influence of jet spacing on the flow topology, induced vortical structures, and boundary-layer statistics. The jet-induced major vortex pair is the dominant flow structure energizing the near-wall boundary layer. The paper details how interactions amongst adjacent vortex pairs differ for varying jet spacings, thus influencing the momentum transfer and eventually the control efficiency. The dynamic behaviour of the flow was analysed using a three-dimensional dynamic mode decomposition. The resulting insights are key to the development of efficient control set-ups.

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“…(1991 a ), Fuller, Thomas & Schetz (1991 b ), Aso et al. (2009), Sharma, Eswaran & Chakraborty (2020) and Sebastian, Lürkens & Schreyer (2020).…”

Section: Introductionmentioning

confidence: 99%

“…Single jets injected at a spanwise or streamwise inclination have been studied by e.g. Fuller et al (1991a), Fuller, Thomas & Schetz (1991b), Aso et al (2009), Sharma, Eswaran & Chakraborty (2020) and Sebastian, Lürkens & Schreyer (2020).…”

Section: Introductionmentioning

confidence: 99%

Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow

Sebastian

Schreyer

2022

J. Fluid Mech.

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“…The advances in the image processing methodologies and camera sensors allow the measurement of the smallest particles present in a spray with high accuracy. There are experimental and numerical studies applied to different ambient conditions and regimes of cross flow, specially focused in atomization of the spray and liquid jet breakup [1][2][3][4][5]. In those studies the optical techniques were the cornerstone for the data acquisition and validation of the simulations.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the droplet characteristics of a SCR injector spray through optical techniques

Bracho

Postrioti

Moreno

et al. 2021

International Journal of Multiphase Flow

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“…Also recent studies from Huh and Lee [21], Zhao et al [22], Williams et al [30], Liu et al [24] numerically investigated the interaction of the jets with supersonic cross flow using high fidelity numerical methods. In addition various authors examined jets in supersonic cross flow in a scramjet engine, numerically [27], [28], [29], [30]. Specifically Miller et al [25] numerically investigated transient interaction between a reaction control jet and Mach 5 cross flow using data from the thesis of Erdem [26].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of sonic transverse jets in Mach 5 crossflow

Erdem

Kontis

2021

Aerospace Science and Technology

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Effect of fuel-jet injection angle variation on the overall performance of a SCRAMJET engine

Cited by 40 publications

References 30 publications

Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow

Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow

Experimental study of the droplet characteristics of a SCR injector spray through optical techniques

Experimental investigation of sonic transverse jets in Mach 5 crossflow

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