Experimental Study on Transpiration Cooling Method through Additively Manufactured Porous Structures
Transient Experiments Using Thermochromic Liquid Crystals
S. Kozłowska (TU Delft - Aerospace Engineering)
J. Sinke – Mentor (TU Delft - Aerospace Manufacturing Technologies)
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Abstract
The purpose of this research study was to experimentally investigate transpiration cooling through additively manufactured porous structures, using Thermochromic Liquid Crystals (TLC). This was done by calculating two cooling parameters: heat transfer coefficient and film cooling effectiveness. Different materials, thicknesses of the porous structure, porosities and blowing ratios (M) were tested. Additionally, the distributions uniformity of the through-pores for each samples were also studied. The experiments showed that the materials tested had similar cooling performances. For all the samples the heat transfer coefficient was increasing with the increasing blowing ratio. Whereas, the film cooling effectiveness was the highest for the blowing ratio M=1. The thickness of the porous structure had no effect on the laterally averaged parameters studied. However, with the thicker samples, the distributions of the through-pores were non-uniform, with some areas having no through-pores.