Numerical Investigation of Film Cooling Effectiveness Including Shockwave Interaction in a Supersonic Nozzle Flow

Sargunaraj, Manoj Prabakar; Torres, Andrés; Garduna, Jose; Otto, Marcel; Kapat, Jayanta; Saxena, Swati

doi:10.2514/6.2022-0795

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…Direct numerical simulation of film cooling as applied to a flat plate with a vertical slot has been reported by Peter and Klooker [ 27 ]. Film cooling in a backward-facing step configuration in which the coolant is injected along a flat wall was investigated numerically by Sargunaraj et al [ 28 ]. The mainstream flow was at Mach 2.44, while the coolant injection Mach number varied from 1.2 to 2.2.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Film Cooling Effectiveness in a Supersonic Nozzle

Somasekharan

Srikrishnan

Kumar

et al. 2023

Entropy

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Film cooling as applied to rocket nozzles is analyzed numerically with emphasis on the assessment of the effect of the mixing of coolant with the hot stream. Cooling performance, as characterized by cooling effectiveness, is studied for three different coolants in the three-dimensional, turbulent flow field of a supersonic convergent-divergent nozzle operating with a hot stream temperature of 2500 K over a range of blowing ratios. The coolant stream is injected tangentially into the mainstream using a diffuser-type injector. Parameters influencing the effectiveness, such as coolant injector configuration and mixing layer, are analyzed. Thermal and species mixing between the coolant and the mainstream are investigated with regard to their impact on cooling effectiveness. The results obtained provide insight into the film cooling performance of the gases and the heat transfer characteristics associated with these three gases. An injector taper angle of 30° results in the most effective cooling among the configurations considered (0°, 15°, 30° and 45°). Mixing of the coolant with the hot stream is examined based on the distributions of velocity, temperature and species. The higher values of cooling effectiveness for Helium are attributed to its thermophysical properties and the reduced rate of mixing with the hot stream. The results further indicate that through optimization of the blowing ratio and the coolant injector configuration, the film cooling effectiveness can be substantially improved.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Film Cooling Effectiveness in a Supersonic Nozzle

Somasekharan

Srikrishnan

Kumar

et al. 2023

Entropy

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Efforts to Identify the Most Suitable RANS Turbulence Model for Accurate Conjugate Heat Transfer Prediction in Regenerative Cooled Nozzles

Khaled,

Khadidja

2024

Journal of Thermal Science and Engineering Applications

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This paper presents a numerical study on regenerative cooling in supersonic nozzles, with the aim of identifying the optimal RANS turbulence model for accurately predicting conjugate heat transfer. Three turbulence models, SST, RSM-ω, and RSM-ω with shear flow corrections (SFC), were tested through comparative analysis and simulations to evaluate their accuracy in predicting the heat flux rate and temperature on the nozzle wall. The results indicate that the RSM-ω turbulence model with shear flow corrections provides the best thermal prediction, achieving an improvement of 28% compared with the next best model. The coolant pressure can be very useful in the case of a very hot gas flow, owing to the increase in its saturation temperature. The height of the slot was found to be less important, which means that another factor can be considered a priority when constructing film-cooling systems. The influence of the hydrogen coolant on the gas temperature was also investigated, and it was found that hydrogen was effective in reducing the wall gas temperature, thus preventing the hot sidewall from reaching temperatures that could melt the wall material. The transient results show that the temperature of the side gas increased rapidly as the coolant side after the start-up process, and the time required for cooling the walls was found to be much higher than that of the hot gas flowing in the nozzle. Good agreement was found between the simulation and available experimental data.

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Numerical Investigation of Film Cooling Effectiveness Including Shockwave Interaction in a Supersonic Nozzle Flow

Cited by 2 publications

References 17 publications

Enhancement of Film Cooling Effectiveness in a Supersonic Nozzle

Enhancement of Film Cooling Effectiveness in a Supersonic Nozzle

Efforts to Identify the Most Suitable RANS Turbulence Model for Accurate Conjugate Heat Transfer Prediction in Regenerative Cooled Nozzles

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