CFD study of effusion cooling

Walton, M and Yang, Z (2012) CFD study of effusion cooling. In: 4th International Symposium on Jet Propulsion and Power Engineering, 10-12 September, Xian, China.

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The desire to increase the efficiency, i.e., reduce the specific fuel consumption and raise the thrust-to-weight ratio, of gas turbines has led to an increase in pressure and temperature in the combustion chamber and turbine. The operational life of the combustion chamber walls decreases with increased temperature thus an effective method of cooling must be used to protect the wall. Effusion cooling provides a practical solution to this engineering problem.
A fundamental understanding of the physical mechanisms involved in effusion flow fields is required to make significant advances in cooling technology. At the same time, designers need a predictive design tool that allows quick turnaround times without the current build and break approach. Computational Fluid Dynamics (CFD) presents the designer with the potential for an effective, fast and relatively accurate method of achieving this.
This paper presents a computational study of effusion cooling applications using the Reynolds Averaged Navier-Stokes (RANS) approach. The need to evaluate the predictive capability of the Reynolds Stress Transport (RST) model when applied to Full Coverage Film-Cooling (FCFC) effusion scenarios is highlighted since two-equation Eddy-Viscosity (EV) models fail to predict turbulent anisotropy and therefore the complex flow mechanisms involved in effusion cooling flow fields. An isothermal and non-isothermal numerical study of effusion cooling flow is conducted. In the isothermal case the RST model is shown to be capable of predicting the injection, penetration, downstream decay and lateral mixing of the effusion jets reasonably well. In the non-isothermal case the laterally averaged cooling effectiveness across the plate is slightly under-predicted but still conforms to the general increasing trend

Item Type: Conference or Workshop Item (Paper)
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL0500 Aeronautics. Aeronautical engineering
Depositing User: Zhiyin Yang
Date Deposited: 31 Oct 2012 10:27
Last Modified: 31 Oct 2012 10:27
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