Investigation on Recess Variation of a Shear Coax Injector for a Single Element GOX-GCH4 Combustion Chamber

Silvestri, Simona; Celano, M.P.; Kirchberger, Christoph; Schlieben, Gregor; Haidn, Oskar; Knab, O.

doi:10.2322/tastj.14.pa_13

Cited by 16 publications

(2 citation statements)

References 11 publications

(17 reference statements)

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“…The dimensions and operating regime were chosen to resemble those of a family of scale rocket combustors, which has been intensively studied over the last decade. 8,27,51,52 However, relevant differences motivated by various constraints should be remarked. Compared to the reference system, the dimensions of the numerical simulation are one order of magnitude smaller, and the mean bulk injection velocity is halved.…”

Section: A Simulation Strategymentioning

confidence: 99%

Analysis of turbulent mixing in a methane–oxygen recessed injector for space propulsion

2023

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Turbulent mixing in a methane–oxygen recessed injector is studied using direct numerical simulations. The operating point is chosen to be fuel-rich and at high pressure to recreate a representative environment for space propulsion applications. The results are used to investigate the transport of the turbulent mixture fraction statistics and the validity of conventional transport models. It is observed that molecular diffusion is only relevant near the boundary layer of the injection recess cavity and at the recirculation zone. Moreover, turbulent mixing in the axial direction is negligible as radial turbulent diffusion dominates. Radial turbulent diffusion near injection is driven by Kelvin–Helmholtz Instabilities (KHI) manifesting at large scales in the order of the injector geometry. The dominance of this process over microscale mixing originates negative turbulent diffusion, which produces a mixture resegregation and the appearance of lean pockets far from the oxidizer injection plane. Gradient models display poor capabilities for the prediction of this sort of phenomena. Closure models for the turbulent mixing transport terms are proposed and evaluated. An anisotropic gradient model is devised, providing performance improvements within the recess cavity and the recirculation region. In addition, a novel filtered Reynolds-averaged Navier Stokes approach based on the mixing state is proposed. This new methodology shows excellent prediction capabilities in the regions dominated by KHI, accurately predicting negative turbulent diffusivity. The challenges associated with this model are commented on, and strategies to enable its application are proposed.

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Section: A Simulation Strategymentioning

confidence: 99%

Analysis of turbulent mixing in a methane–oxygen recessed injector for space propulsion

2023

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“…The influence of the geometry (chamber length) was also highlighted. Cai et al studied experimentally and numerically the influence of the injector design on the heat fluxes [6] while Silvestri et al measured the influence of coaxial injector recess length on heat transfer [7]. Celano et al also experimented single and multi-injector configurations using methane as the fuel [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Heat Transfer in a Subscale Liquid Rocket Engine

Grenard

Fdida

Vingert

et al. 2019

Journal of Propulsion and Power

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This work presents the experimental investigation of heat fluxes through the walls of a reduced-scale rocket motor using hydrogen and oxygen as propellants. The engine is watercooled so that it can be run in steady state for up to 120 s. More than 100 thermocouples are used to retrieve wall temperature and derive heat fluxes. It is shown how the chamber pressure affects the overall heat-flux level, while the mixture ratio greatly influences its distribution. Direct visualisation of the flame provides an indication that the heat-flux distribution is correlated to the location of heat release given by OH* visualization.

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Combustion Characteristics of Shear Coaxial Injectors with Different Recess Lengths Under Wide Operating Conditions

Kang,

Lee,

Ahn

2024

Int. J. Aeronaut. Space Sci.

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Investigation on Recess Variation of a Shear Coax Injector for a Single Element GOX-GCH4 Combustion Chamber

Cited by 16 publications

References 11 publications

Analysis of turbulent mixing in a methane–oxygen recessed injector for space propulsion

Analysis of turbulent mixing in a methane–oxygen recessed injector for space propulsion

Experimental Investigation of Heat Transfer in a Subscale Liquid Rocket Engine

Combustion Characteristics of Shear Coaxial Injectors with Different Recess Lengths Under Wide Operating Conditions

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