Effect of Porosity and Injection Ratio on the Performance of Transpiration Cooling through Gyroids

IF 1.3 Q2 ENGINEERING, AEROSPACE

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2023-12-01 DOI:10.3390/ijtpp8040050

Benjamin J. Brimacombe, James A. Scobie, Joseph M. Flynn, C. Sangan, Oliver J Pountney

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Abstract

This paper presents experimental measurements of adiabatic effectiveness for three transpiration cooling porosities (ϕ= 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= 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 = 0.029, 0.048, and 0.062) and common injection ratios (F = 0.010, 0.017, and 0.022) the cooling performance was found to be dependent on porosity for constant M but not for constant F. Having determined F as the more important parameter for comparison, results are presented alongside transpiration and effusion data from literature.

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孔隙率和喷射比对通过陀螺仪进行蒸气冷却的性能的影响

本文提出了三种蒸腾冷却孔隙(φ = 0.3, 0.4和0.5)的绝热有效性的实验测量由陀螺晶格结构构成。据作者所知，这是第一次使用三周期最小表面(TPMS)函数来产生不同孔隙度的蒸腾试验片。利用立体光刻技术(SLA)成功打印了聚合物陀螺晶格结构，其ϕ= 0.3，打印分辨率为25微米，单元尺寸为2毫米。在一个小型风洞中测量了冷却性能。采用高分辨率红外热像仪测定多孔截面下游的壁温。在常规吹气比(M = 0.029、0.048和0.062)和常规喷射比(F = 0.010、0.017和0.022)下进行测试时，发现恒定M时的冷却性能取决于孔隙度，而恒定F时则无关。确定F为更重要的比较参数后，结果与文献中的蒸腾和渗出数据一起呈现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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