Full coverage film cooling using compound angle

Michel, Bertrand; Gajan, Pierre; Strzelecki, Alain; Savary, Nicolas; Kourta, Azeddine; Boisson, H. C.

doi:10.1016/j.crme.2009.06.012

Cited by 15 publications

(4 citation statements)

References 8 publications

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“…Compound angle injection on convex surface showed high film cooling effectiveness at moderate and high blowing ratios. Michel et al [18] have carried out experimental and numerical study on a cooling film issuing from a multiperforated wall of a simplified combustor. They have shown that the film thickness and turbulence are greatly increased by compound angle holes.…”

Section: Gaseous Film Cooling Studiesmentioning

confidence: 99%

Influence of coolant injector configuration on film cooling effectiveness for gaseous and liquid film coolants

2011

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An experimental investigation is conducted to bring out the effects of coolant injector configuration on film cooling effectiveness, film cooled length and film uniformity associated with gaseous and liquid coolants. A series of measurements are performed using hot air as the core gas and gaseous nitrogen and water as the film coolants in a cylindrical test section simulating a thrust chamber. Straight and compound angle injection at two different configurations of 30°-10°and 45°-10°are investigated for the gaseous coolant. Tangential injection at 30°and compound angle injection at 30°-10°are examined for the liquid coolant. The analysis is based on measurements of the film-cooling effectiveness and film uniformity downstream of the injection location at different blowing ratios. Measured results showed that compound angle configuration leads to lower far-field effectiveness and shorter film length compared to tangential injection in the case of liquid film cooling. For similar injector configurations, effectiveness along the stream wise direction showed flat characteristics initially for the liquid coolant, while it was continuously dropping for the gaseous coolant. For liquid coolant, deviations in temperature around the circumference are very low near the injection point, but increases to higher values for regions away from the coolant injection locations. The study brings out the existance of an optimum gaseous film coolant injector configuration for which the effectiveness is maximum.

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Section: Gaseous Film Cooling Studiesmentioning

confidence: 99%

Influence of coolant injector configuration on film cooling effectiveness for gaseous and liquid film coolants

2011

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“…Michel and colleagues conducted experimental and numerical studies using a simplified combustion chamber platform with porous wall film cooling. This enhanced the understanding of film dynamics and established an experimental database on simplified geometries to validate numerical models [16]. S.R.…”

Section: Introductionmentioning

confidence: 97%

Effects of Different Structural Film Cooling on Cooling Performance in a GO2/GH2 Subscale Thrust Chamber

Xiang,

Jia,

et al. 2024

Aerospace

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To investigate the wall cooling of the thrust chamber in an engine, two film-cooling structures, namely, a circular hole structure and a slot structure, were designed. Numerical simulations were performed to study the coupled flow and regenerative cooling heat transfer in thrust chambers with different structures. The influences of parameters such as the film mass flow rate and film hole size on wall cooling were analyzed. Experiments were conducted in a thrust chamber to validate the accuracy of the numerical calculation method. The results indicate that the slot-structured film adheres better to the wall than the circular-hole-structured film, and the film closely adhering to the wall provides better insulation against hot gas, resulting in a reduction of approximately 6% in wall temperature. When the film hole size changes, the change in circumferential wall temperature in the upstream region of the slot-structured film is more pronounced. This paper aims to provide a reference for the design of the cooling structure at the head of the thrust chamber in engineering and suggests directions for optimization and improvement.

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“…Ekkad [18] and Lee [19] studied the cooling efficiencies of different coolants with different densities at large compound angles and found that coolants with lower densities have higher cooling efficiencies. Brice Michel [20] experimentally found that the cooling efficiency can greatly be enhanced by a swirling injection. They compared different injection models with the experimental results and found that the standard model has significant difficulty in predicting high-accuracy results, while the multi-perforation model has high accuracy.…”

Section: Introductionmentioning

confidence: 99%

Study of Tangential Effusion Cooling of a Combustor Liner

Xie

Zeng

et al. 2023

Processes

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Tangential effusion cooling of a combustor liner has a large difference from traditional effusion cooling on a plate. In this paper, numerical simulation is carried out to study the flow field, heat transfer characteristics and the factors affecting the cooling effectiveness of tangential effusion cooling of a combustor liner. It is found that the cooling film formed by the tangential jet is distributed in a divergent “horsetail” shape and adheres tightly to the inner wall of the liner, which increases the cooling area and effectiveness. Three different tangential inlet cooling hole arrangements and their cooling efficiencies are studied, and several important parameters that affect the cooling effectiveness are summarized. Then, an improved cooling hole arrangement is proposed, and its cooling efficiency is studied and compared with those of the original three arrangements. The results show that the new arrangement significantly improves the comprehensive cooling efficiency and decreases the wall temperature, thus confirming the effectiveness of the improved strategy and providing a theoretical basis for the subsequent cooling design to improve the cooling efficiency for a combustor liner.

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Full coverage film cooling using compound angle

Cited by 15 publications

References 8 publications

Influence of coolant injector configuration on film cooling effectiveness for gaseous and liquid film coolants

Influence of coolant injector configuration on film cooling effectiveness for gaseous and liquid film coolants

Effects of Different Structural Film Cooling on Cooling Performance in a GO2/GH2 Subscale Thrust Chamber

Study of Tangential Effusion Cooling of a Combustor Liner

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