Film Cooling Performance of Multiple Arrays of Cylindrical and Fan-Shaped Holes
2015 (English)In: Journal of Propulsion and Power, ISSN 0748-4658, E-ISSN 1533-3876, Vol. 31, no 6, 1621-1630 p.Article in journal (Refereed) Published
Experimental investigations are performed on the suction side of a cooled turbineguide vane. Transient IR thermography is used to evaluate film cooling performanceof cylindrical and fan-shaped holes in a test facility representing engine conditions.Adiabatic film effectiveness (AFE) and net heat flux reduction (NHFR) results due tocoolant injection through double and multiple rows in the presence and absence of anupstream showerhead are presented. Two double staggered rows at different positionshave been cross-compared; one at a relatively high convex curvature region and theother close to the maximum throat velocity. A combination of the two double rowsis considered to be multiple rows. The tested blowing ratios are in the interval of[0.6 – 1.2] and [0.3 – 1.2] for double and multiple rows, respectively. The showerheadcooling is maintained at nominal blowing ratio. The findings suggest that the choice ofbest cooling hole shape for film cooling design can be highly influenced by the numberof cooling rows to be used and also the presence (or absence) of showerhead cooling.It is worth noting that the outcome may differ depending on the quantity of interest, i.e. AFE or NHFR.
Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2015. Vol. 31, no 6, 1621-1630 p.
Film Cooling, Gas Turbine, Film Effectiveness, Net Heat Flux Reduction, Cylindrical Holes, Fan-shaped Holes
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:liu:diva-117030DOI: 10.2514/1.B35618ISI: 000368248000011OAI: oai:DiVA.org:liu-117030DiVA: diva2:802171
ProjectsTurbo Power Program
Funding agencies: Swedish Energy Agency; Siemens Industrial Turbomachinery, AB; GKN Aerospace Sweden, AB; Royal Institute of Technology through the Swedish research program TURBO POWER
Vid tiden för disputationen förelåg publikationen endast som manuskript2015-04-112015-04-112016-03-14Bibliographically approved