Overview of Combustion Instabilities in Liquid Rocket Engines - Coupling Mechanisms &amp; Control Techniques

Bennewitz, John W.; Frederick, Robert A.

doi:10.2514/6.2013-4106

Cited by 22 publications

(20 citation statements)

References 12 publications

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“…If this cause the burning rate to oscillate with the correct phase, the intensity of the instability can increase, which amplifies flame oscillations. These amplified flame oscillations will then drive larger pressure disturbances, resulting in the growth of the instability [1].…”

Section: Introductionmentioning

confidence: 99%

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An Analytical Investigation Characterizing the Application of Single Frequency Acoustic Modulation for High Frequency Combustion Instability Suppression

Cranford¹,

Bennewitz²,

Rani³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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Section: Introductionmentioning

confidence: 99%

“…Many of these techniques developed focus on providing acoustic dampening at the point of injection or altering the unsteady heat release. Essentially, this means that the suppression techniques are aimed at either damping the acoustic modes of the chamber or altering the energy release process for combustion, or both [1].…”

Section: Introductionmentioning

confidence: 99%

An Analytical Investigation Characterizing the Application of Single Frequency Acoustic Modulation for High Frequency Combustion Instability Suppression

Cranford¹,

Bennewitz²,

Rani³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

Self Cite

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“…applying band-limited white noise, single frequencies etc. ), as opposed to solely pulsing the flow at one frequency mechanically [4].…”

Section: Introductionmentioning

confidence: 99%

Application of Band-Limited White Noise & Single Frequency Acoustic Modulation as a Control Mechanism for Liquid Rocket Engine Combustion Instabilities

Bennewitz¹,

Cranford²,

Lineberry³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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This research investigation encompasses expanded testing of a high frequency combustion instability suppression technique, in which an instability is able to be controlled by acoustically modulating the incoming oxidizer flow. To test this concept, a single element model rocket combustor (dinner = 10.16 cm and l = 16.51 cm) which burned gaseous oxygen and methane was implemented. The single injector incorporated was of a 45 o impinging pentad style with a JBL 2446J compression driver at the base of the oxidizer supply line. Using this test facility, two acoustic modulation approaches were investigated to determine their effectiveness at damping a spontaneously excited f ≈ 2,400 Hz longitudinal instability. The first approach saw varying 500 Hz bands of white noise applied from f = 0-500 Hz to 2,000-2,500 Hz, while the second approach implemented single frequency signals with arbitrary phase swept from f = 500 Hz -2,500 Hz. It was found that above a certain signal amplitude threshold, 95+ % suppression of the spontaneous combustion oscillation was achieved using these two acoustic modulation approaches. Also, the frequency ranges associated with instability suppression were shown to expand with increased amplitude of the applied acoustic signal in both the band-limited white noise and single frequency sweep studies. Thus from these results, further evidence is provided to support the strategic application of acoustic modulation within an injector as a potential method to control high frequency combustion instabilities for liquid rocket engine applications.

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“…Specifically, this experiment configuration was capable of applying pressure disturbances within the oxidizer post of the injector at amplitudes large enough to modulate the propellant flow, through altering the injector acoustics. This model combustor provided a platform to test the effectiveness of various pressure signals at controlling the dominant instability mode (Note: A more detailed background for this novel instability suppression technique is presented in [7] ).…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Single Injector with Applied High Frequency Pressure Disturbances For Applications To Liquid Rocket Engine Combustion Instabilities

Bennewitz

Lineberry

Frederick

2013

49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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This research investigation demonstrates a new high frequency combustion instability control approach in which the dominant instability mode is able to be suppressed by strategically applying pressure disturbances within the oxidizer post of an injector. By housing a piezoelectric speaker at the base of the injector, the incoming oxidizer flow into the combustor is able to be acoustically modulated, causing the oscillatory behavior of the combustor to be altered. Thus, given the correct acoustic signal, a suppression of high frequency combustion instabilities is able to be achieved. To test this concept, a cylindrical model combustor (dinner = 4 in. and l = 6.5 in.) was constructed, which incorporated a single 45 o impinging pentad injector with a JBL 2446J Compression Driver at the base of the oxidizer post. Using this test facility, an investigation involving the application of varying bands of white noise (ranging from 0 Hz -500 Hz to 2,000 Hz -2,500 Hz) to dampen out a high frequency instability (f ≈ 2,430 Hz) was conducted. Across the two tests performed, it was found that a complete suppression of the f ≈ 2,430 Hz instability was possible when applying ≈ 500 Hz -1000 Hz band limited white noise at 0.3 psi rms constant amplitude. Thus, this indicates that strategically applying band limited white noise within an injector through acoustic forcing could potentially be used to control high frequency combustion instabilities within liquid rocket engine combustors.

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Overview of Combustion Instabilities in Liquid Rocket Engines - Coupling Mechanisms & Control Techniques

Cited by 22 publications

References 12 publications

An Analytical Investigation Characterizing the Application of Single Frequency Acoustic Modulation for High Frequency Combustion Instability Suppression

An Analytical Investigation Characterizing the Application of Single Frequency Acoustic Modulation for High Frequency Combustion Instability Suppression

Application of Band-Limited White Noise & Single Frequency Acoustic Modulation as a Control Mechanism for Liquid Rocket Engine Combustion Instabilities

Investigation of a Single Injector with Applied High Frequency Pressure Disturbances For Applications To Liquid Rocket Engine Combustion Instabilities

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