Characterization of Gas-Centered Swirl-Coaxial Injector Stability in a Subscale Multi-Element Combustor

Pomeroy, Brian; Sisco, James C.; Eckstein, James R.; Anderson, William E.

doi:10.2514/6.2008-5249

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…This asymmetry is not fully understood since a consistent asymmetry is not present for the other two test conditions. In the X-ray radiography cold flow studies performed by Schumaker et al 13 , an asymmetry of the mass distribution in the swirling spray was observed at different operating conditions for a single injector. It is possible that American Institute of Aeronautics and Astronautics 4 a similar mechanism is occurring during Tests 2 and 3, where greater concentrations of fuel are present at different spray locations, resulting in higher CH* and OH* concentrations at those locations.…”

Section: A Average Behaviormentioning

confidence: 96%

“…A numerical study by Muss et al 12 demonstrated phenomenological differences between cold flow and hot-fire spray patterns, particularly droplet size. Pomeroy et al 13 and Morgan et al 14 studied the response of GCSC injectors to transverse instabilities, but no effort to characterize the flame in steady-state conditions was attempted as the combustion chamber produced a self-excited combustion instability.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Study of Acoustic Forcing on Gas-Centered Swirl-Coaxial Reacting Flows

Roa

Schumaker

Talley

et al. 2017

55th AIAA Aerospace Sciences Meeting

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Section: A Average Behaviormentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

A Study of Acoustic Forcing on Gas-Centered Swirl-Coaxial Reacting Flows

Roa

Schumaker

Talley

et al. 2017

55th AIAA Aerospace Sciences Meeting

View full text Add to dashboard Cite

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“…[7][8] This combustor achieved spontaneous transverse instabilities with strong transverse modal character. Depending on the arrangement of driving elements, instability amplitudes ranging from about 10-100% of mean chamber pressure were demonstrated.…”

Section: Approachmentioning

confidence: 99%

Effect of Step Height on Level of Combustion Instability in a Subscale Transverse Rocket Combustor

Wierman¹,

Morgan²,

Anderson³

2012

48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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A transverse combustor with a linear array of driving elements was tested in two test series with different driving element step heights. A single LOX/LCH 4 study element was located at the velocity antinode of the expected 1W velocity antinode. Chamber flow rates and conditions were kept consistent across the two test series. Between the two test series, 1W pressure amplitude increased for test periods with only driving elements flowing propellant, and 1W pressure amplitude decreased for test periods with both study and driving elements flowing propellant. However these effects were not strongly pronounced. Further testing of increasing step heights is necessary to make definitive conclusions on the effect of driving element step height in transverse combustion. Nomenclature m = mass flow rate

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“…Research concerning injector characteristics has employed various experimental and numerical analysis methodologies [16]. Broadly, research direction encompasses analyses of steady-state performance and investigations into dynamic stability [17]. Experimental studies have assumed diverse forms, such as spray tests using surrogate fluids, spray tests employing actual propellants, and combustion tests.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Spray and Combustion Characteristics in Gas-Centered Swirl Coaxial Injectors: Influence of Recess Ratio and Gas Swirl

Lee,

Woo

et al. 2024

Aerospace

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The spray and combustion characteristics of a gas-centered swirl coaxial (GCSC) injector used in oxidizer-rich staged combustion cycle engines were analyzed. The study focused on varying the recess ratio, presence of gas swirl, and swirl direction to improve injector performance. The impact of the recess ratio was assessed by increasing it for gas jet-type injectors with varying momentum ratios. Gas-swirl effects were studied by comparing injectors with and without swirl against a baseline of a low recess ratio gas injection. In atmospheric pressure-spray experiments, injector performance was assessed using backlight photography, cross-sectional imaging with a structured laser illumination planar imaging technique (SLIPI), and droplet analysis using ParticleMaster. Increasing the recess ratio led to reduced spray angle and droplet size, and trends of gas swirl-type injectors were similar to those of high recess ratio gas jet-type injectors. Combustion tests involved fabricating combustion chamber heads equipped with identical injectors, varying only the injector type. Oxidizer-rich combustion gas, produced by a pre-burner, and kerosene served as propellants. Combustion characteristics, including characteristic velocity, combustion efficiency, and heat flux, were evaluated. Elevated recess ratios correlated with increased characteristic velocity and reduced differences in the momentum–flux ratios of injectors. However, increasing the recess ratio yielded diminishing returns on combustion efficiency enhancement beyond a certain threshold. Gas swirling did not augment characteristic velocity but notably influenced heat flux distribution. The trends observed in spray tests were related to combustion characteristics regarding heat flux and combustion efficiency. Additionally, it was possible to estimate changes in the location and shape of the flame according to the characteristics of the injector.

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Characterization of Gas-Centered Swirl-Coaxial Injector Stability in a Subscale Multi-Element Combustor

Cited by 10 publications

References 5 publications

A Study of Acoustic Forcing on Gas-Centered Swirl-Coaxial Reacting Flows

A Study of Acoustic Forcing on Gas-Centered Swirl-Coaxial Reacting Flows

Effect of Step Height on Level of Combustion Instability in a Subscale Transverse Rocket Combustor

Experimental Study of Spray and Combustion Characteristics in Gas-Centered Swirl Coaxial Injectors: Influence of Recess Ratio and Gas Swirl

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