scholarly journals Transpiration Cooling Performance in LOX/Methane Liquid-Fuel Rocket Engines

2005 ◽  
Vol 42 (3) ◽  
pp. 476-486 ◽  
Author(s):  
Andrea Bucchi ◽  
Claudio Bruno ◽  
Alessandro Congiunti
Keyword(s):  
Liquid Fuel ◽  
Transpiration Cooling ◽  
Rocket Engines ◽  
Cooling Performance ◽  
Lox Methane

Properties and Application of Oriented Porous SiC as Transpiration Cooling Materials

2007 ◽  
Vol 336-338 ◽  
pp. 1109-1112 ◽  
Author(s):  
Jie Tang ◽  
Yu Feng Chen ◽  
Ji Guo Sun ◽  
Hua Wang ◽  
Hai Lin Liu ◽  
...  
Keyword(s):  
Pore Structure ◽  
Pore Size ◽  
Cooling System ◽  
Casting Process ◽  
Solid Loading ◽  
Transpiration Cooling ◽  
Rocket Engines ◽  
Intrinsic Permeability ◽  
Sic Ceramics ◽  
Porous Sic

This paper describes the fabrication of porous reaction-bonded SiC ceramics with radial directed pores and the application of these materials to transpiration cooling system of rocket engines. A special mold is designed for freeze-casting process to prepare SiC cylinders with radial directed pores. Green bodies with well-oriented pore structure are obtained from slurry with solid loading up to 47vol%. The pore size is in the level of several tens micron. Green bodies with various porosities are infiltrated with different amount of liquid Si. The intrinsic permeability of each sample is measured with air as flowing media. It is concluded that permeability has relationship with not only the porosity but also the pore structure of samples.

AN EXPERIMENTALLY VALIDATED LOW ORDER MODEL OF THE THERMAL RESPONSE OF DOUBLE-WALL EFFUSION COOLING SYSTEMS FOR HP TURBINE BLADES

2021 ◽  
pp. 1-13
Author(s):  
Alexander V Murray ◽  
Peter Ireland ◽  
Eduardo Romero
Keyword(s):  
Heat Transfer ◽  
Thermal Model ◽  
Transpiration Cooling ◽  
Transfer Coefficients ◽  
Order Model ◽  
Cooling Performance ◽  
Convective Cooling ◽  
Heat Transfer Coefficients ◽  
Double Wall ◽  
Low Order

Abstract Transpiration cooling represents the pinnacle of turbine cooling and is characterised by an intrinsic porosity achieving high internal convective cooling, and full coverage film cooling. The quasi-transpiration, double-wall effusion system attempts to replicate the cooling effect of transpiration cooling. The system is characterised by a large wetted area providing high internal convective cooling performance, with a highly porous external wall allowing the formation of a protective cooling film. This paper presents a low-order thermal model of a double-wall system designed to rapidly ascertain cooling performance based solely on the geometry, thermal conductivity, and approximate surface heat transfer coefficients. Initially validation uses experimental data with heat transfer coefficients for the low order model obtained from fully conjugate CFD simulations. A more controlled CFD study is then undertaken with both fully conjugate and fluid only simulations performed on several double-wall geometries to ascertain both overall and film effectiveness data. Data from these simulations are used as inputs to the low order thermal model and the results compared. The low order model successfully captures both the trends and absolute cooling effectiveness achieved by the various double-wall geometries. The model therefore provides a powerful tool whereby the cooling performance of double-wall geometries can be near instantaneously predicted during the initial design stage, potentially allowing geometry optimisation to rapidly occur prior to more in-depth, costly and time-consuming analyses. This benefit is demonstrated via the implementation of the model with input boundary conditions obtained using empirical correlations.

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