Experimental Study on the Overall Cooling Effectiveness of Effusion-Cooling Ceramic Matrix Composite Platform  

作　　者：DU Kun CHEN Qihao HUANG Xiaoyang LIANG Tingrui LIU Cunliang 

机构地区：[1]School Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China [2]Yangtze River Delta Research Institute of NPU,Northwestern Polytechnical University,Taicang 215400,China [3]Shaanxi Key Laboratory of Thermal Sciences in Aero-Engine System,Northwestern Polytechnical University,Xi'an 710129,China [4]NPU-KAI International Joint Laboratory of Advanced Aero-Engine Thermal Structure,Northwestern Polytechnical University,Xi'an 710129,China [5]AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China

出　　处：《Journal of Thermal Science》2023年第3期1034-1048,共15页热科学学报（英文版）

基　　金：support of National Natural Science Foundation of China(No.52006178);National Key R&D Program of China(No.Y2019-Ⅷ-0007-0168);the Fundamental Research Funds for the Central Universities;the Innovation Capacity Support Plan in Shaanxi Province of China(Grant No.2023-CX-TD-19)。

摘　　要：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.

关 键 词：conjugate heat transfer effusion cooling ceramic matrix composite temperature ratio 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]