Accession Number : ADA485127


Title :   Transonic Cascade Measurements to Support Analytical Modeling


Descriptive Note : Final rept. 1 Oct 2004-30 Sep 2007


Corporate Author : STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : Eaton, John K. ; Durbin, Paul A.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA485127


Report Date : 20 JUL 2008


Pagination or Media Count : 55


Abstract : We have developed a set of benchmark experiments and advanced simulation capabilities for the critical problem of turbine blade trailing-edge film cooling. Modern designs produce low cooling flow effectiveness, and improved designs can't be developed because standard turbulence models grossly overpredict the effectiveness. Two experiments were developed to provide detailed mean velocity and turbulence data around a blade trailing edge in low speed flow and high speed flow with full scale Mach and Reynolds numbers. A new implementation of detached eddy simulation has been developed and applied to a trailing edge film cooling geometry. This has shown favorable agreement with the first set of measurements. This report includes the complete results for the low-speed experiment and detached eddy simulation, as well as the results from the transonic experiment which have been obtained to date. The results show the physical reasons behind the low film-cooling effectiveness of practical trailing edge breakouts. They also show that detached eddy simulation can accurately capture these physical effects with careful attention to the implementation of inlet boundary conditions.


Descriptors :   *MEASUREMENT , *CASCADES(FLUID DYNAMICS) , *TRANSONIC FLOW , FILM COOLING , ANALYTIC FUNCTIONS , TRAILING EDGES , MODELS , SIMULATION , VELOCITY , TURBINE BLADES


Subject Categories : FLUID MECHANICS


Distribution Statement : APPROVED FOR PUBLIC RELEASE