Affiliation:
1. DIEF, Department of Industrial Engineering, University of Florence, Florence 50139, Italy
2. Baker Hughes, Florence 50127, Italy
Abstract
Abstract
Surface roughness is well known to significantly influence turbine aerodynamics and heat transfer; different studies have been undertaken in the last decades, in order to precisely characterize its effects and pursue a reliable and unified computational fluid dynamics modeling approach. Despite the effort, further research is still required to completely fulfill the goal, due to the complexity of the considered environment, with many other aspects and flow characteristics factoring into the final behavior. In this work, an experimental campaign was carried out to evaluate the heat transfer coefficient on a linear nozzle guide vane geometry. The adopted geometry has been developed and tested, at different inlet turbulence intensity, Reynolds and Mach number, at Von Kármán Institute. The results achieved on a test article with smooth surface were made available. In the present work, the effect of increased turbulence level and surface roughness was taken into account, respectively, using passive grids and conditioning the test sample surface finishing. Experiments were conducted using a transient technique by measuring the surface temperature evolution by IR thermography. The collected results integrate the existing database available in the open literature in order to support development and benchmarking of numerical approaches aimed at a reliable characterization of these aspects.
Reference37 articles.
1. Boundary Layer Transition: Freestream Turbulence and Pressure Gradient Effects;Driest;AIAA J.,1963
2. The Influence of Large-Scale High-Intensity Turbulence on Vane Heat Transfer;Ames;ASME J. Turbomach.,1997
3. Detailed Boundary Layer Measurements on a Turbine Stator Vane At Elevated Freestream Turbulence Levels;Radomsky;ASME J. Turbomach.,2002
4. An Account of Free-Stream-Turbulence Length Scale on Laminar Heat Transfer;Dullenkopf;ASME Conference Proceedings (94-GT-174),1994
5. Experimental Study of Vane Heat Transfer and Aerodynamics at Elevated Levels of Turbulence;Ames,1994
Cited by
12 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献