Effects of recess length on combustion instability in a model chamber with a gas-centered swirl coaxial injector

Wang, Yuangang; Cho, Cheon Hyeon; Du, Jiajun; Sohn, Chae Hoon

doi:10.1016/j.ast.2022.107911

Cited by 6 publications

(1 citation statement)

References 33 publications

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“…This type can be further distinguished by liquid or gaseous fluids being injected through the central tube, thus liquid-centered or gaseous-centered coaxial elements. Here gaseous centered coaxial injectors with a tuned element length can mitigate the combustion chamber's vulnerability to longitudinal combustion instabilities [2]. Additional swirling of one or both propellant components (swirl-coaxial injector) can improve the mixing characteristics.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Flame Anchoring Behavior in a LOX/LNG Rocket Combustor

et al. 2023

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Hot fire tests of a multi-injector research combustor were performed with liquid-oxygen and liquefied-natural-gas (LOX/LNG) propellants at chamber pressures from 30 up to 67 bar, hence at conditions similar to an upper stage rocket engine. Within these tests shear coaxial injectors were tested with and without a recessed LOX post. In both configurations, operating conditions with flames anchored at the LOX post tip and thus, if available, pre-combustion in the recess volume as well as lifted flames were observed. Flame anchoring was indirectly detected via acoustic measurements, using mean speed of sound to indicate the presence of flame in the head end of the combustion chamber. While the injector without recess showed only stable combustion irrespective of the flame anchoring behavior, the recessed injector featured short-lived bursts of oscillatory combustion and sustained combustion instabilities. Analysis of the test data showed that stable flame anchoring could not be ensured at momentum flux ratios below 20 for a non-recessed and below 45 for a recessed injector.

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Section: Introductionmentioning

confidence: 99%