An Experimental Investigation on Transpiration Cooling Based on the Double-Laminated Sintered Woven Wire Mesh Structures Available to Purchase

This paper experimentally investigated a cooling performance of double-laminated sintered woven wire mesh structures with different porosities. Each double-laminated test piece was made up of two parts which had different porosities and same thickness, and the total thickness is 6mm. The porosities of test pieces include 25.6%, 37.1%, 46.9% and 55.1%. All the tests were performed with air. In the experiments, the flow rate of main flow kept at 300Kg/h, and the blowing ratio between the cooling air and main flow approximately varied from 1.2% to 9%. The average surface temperature of test pieces was captured by an infrared thermal imager. Temperature of the main flow was fixed at 100°C. The cooling effectiveness for each specimen was calculated and analyzed. Experimental results showed that the cooling efficiency increases as the increase of the average porosity. The results also indicated that the cooling efficiency of the double-laminated model is affected by two layers together; the porosity and arrangement of two parts influents the cooling efficiency coupled. At last, the cooling performance of specimen with single porosity is higher than the specimen with combined porosity when the test pieces had a same geometric size.