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Experimental Study on the Overall Cooling Effectiveness of Effusion-Cooling Ceramic Matrix Composite Platform
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作者 DU Kun CHEN Qihao +2 位作者 HUANG Xiaoyang liang tingrui LIU Cunliang 《Journal of Thermal Science》 SCIE EI CAS CSCD 2023年第3期1034-1048,共15页
Ceramic matrix composite(CMC),with higher thermal limit and lower density relative to the superalloy,is regarded as the most important structural material for modern gas turbine engines.However,the anisotropic thermal... Ceramic matrix composite(CMC),with higher thermal limit and lower density relative to the superalloy,is regarded as the most important structural material for modern gas turbine engines.However,the anisotropic thermal conductivities caused by the weave patterns totally change the thermal conduction performance inside the solid domain.Therefore,the present study aims to use the infrared thermographic to measure the SiC/SiC composite platform with staggered effusion holes along with the superalloy platform.CMC platform is prepared by 2-D plain weave braid structure with chemical vapor infiltration(CVI)process.The temperature of mainstream is 900 K to match the real mainstream to coolant temperature ratio(T_(g)/T_(c)=1.5,2.1).The experimental was conducted with seven mass flow ratios(MFR=1.5%-4.5%).The results indicate that the thermal conductivity along the thickness direction is of great importance for the CMC platform.The superalloy platform obtains higher level of overall cooling effectiveness than CMC at T_(g)/T_(c)=1.5.However,the CMC platform achieves greater overall cooling effectiveness relative to superalloy at T_(g)/T_(c)=2.1.In addition,CMC platform presents enhanced uniformity of overall cooling effectiveness due to the larger in-plane thermal conductivity. 展开更多
关键词 conjugate heat transfer effusion cooling ceramic matrix composite temperature ratio
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