Publication de 18 numéros par an
ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561
Indexed in
Influence of Internal Cyclone Flow on Adiabatic Film Cooling Effectiveness
RÉSUMÉ
The adiabatic film cooling effectiveness on the surface of a symmetrical blade model was measured for eight cylindrical, 59° inclined cooling holes. The holes were fed with different flow types using a cylindrical leading-edge channel. Two configurations were compared: on the one hand, a leading-edge channel flow without swirl (datum configuration), using a sharp-edged inlet; on the other hand, a new cyclone cooling configuration with a positive swirl. The experiments were carried out using the calibrated ammonia diazo technique. The blowing ratios were varied between 0.6 and 1.2, and the film cooling discharge was set to either 20% or 50%. For all these operation points, multiple experiments were conducted and combined using a weighting average method to produce a high full-range resolution. The lateral and area-averaged adiabatic effectiveness is presented up to 45D downstream of the cooling holes. The measurements show a higher area-averaged effectiveness immediately downstream of the cooling holes when using the cyclone cooling configuration. This is due to nonsymmetric flow structures inside the cooling holes. Further downstream, however, it decreases faster. With a low film cooling discharge and rising blowing ratios, these effects are more pronounced.
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Seibold Florian, Ligrani Phillip, Weigand Bernhard, Flow and heat transfer in swirl tubes — A review, International Journal of Heat and Mass Transfer, 187, 2022. Crossref
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Luan Yong, Rao Yu, Weigand Bernhard, Experimental and numerical study of heat transfer and pressure loss in a multi-convergent swirl tube with tangential jets, International Journal of Heat and Mass Transfer, 190, 2022. Crossref