Resumen
This paper presents experimental measurements of adiabatic effectiveness for three transpiration cooling porosities (ϕ=" role="presentation">??=?=
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=
0.3, 0.4, and 0.5) constructed from gyroid lattice structures. To the authors? knowledge, this is the first use of a Triply Periodic Minimal Surface (TPMS) function to produce transpiration test coupons of varying porosity. Polymer gyroid lattice structures were successfully printed using Stereolithography (SLA) down to ϕ=" role="presentation">??=?=
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=
0.3 for a print resolution of 25 microns and unit cell size of 2 mm. Cooling performance was measured in a small-scale wind tunnel. High-resolution Infrared Thermography was used to determine wall temperatures downstream of the porous section. When tested at both common blowing ratios (M" role="presentation">??M
M
= 0.029, 0.048, and 0.062) and common injection ratios (F " role="presentation">?? F
F
= 0.010, 0.017, and 0.022) the cooling performance was found to be dependent on porosity for constant M" role="presentation">??M
M
but not for constant F" role="presentation">??F
F
. Having determined F" role="presentation">??F
F
as the more important parameter for comparison, results are presented alongside transpiration and effusion data from literature.