CAJ | 학술논문

气(汽)雾冷却叶片是新一代高效叶片冷却技术的一个重要发展方向，具有广阔的应用前景和发展潜力。在构建的高温涡轮叶片内冷通道气(汽)雾两相流对流冷却实验平台上，研究雷诺数、壁面热流密度以及水雾质量流量对汽雾冷却通道壁面温度分布和换热系数的影响，并与相同工况下蒸汽的换热性能进行对比。主要结果显示，向主流蒸汽中喷入少量细小雾滴形成汽雾两相流冷却介质，其平均努赛尔数最高可达纯蒸汽的3.46倍；当冷却工况因子小于23时，汽雾冷却通道中部区域将出现明显的大液滴沉降和蒸发，冷却效果显著提高。
기(기)무냉각협편시신일대고효협편냉각기술적일개중요발전방향，구유엄활적응용전경화발전잠력。재구건적고온와륜협편내랭통도기(기)무량상류대류냉각실험평태상，연구뢰낙수、벽면열류밀도이급수무질량류량대기무냉각통도벽면온도분포화환열계수적영향，병여상동공황하증기적환열성능진행대비。주요결과현시，향주류증기중분입소량세소무적형성기무량상류냉각개질，기평균노새이수최고가체순증기적3.46배；당냉각공황인자소우23시，기무냉각통도중부구역장출현명현적대액적침강화증발，냉각효과현저제고。
Convective mist/air (steam) cooling is one of potential promising technology for advanced gas turbine blade cooling. It can greatly improve the cooling effectiveness of turbine blade using two-phase flow. Based on the experimental platform which was built to investigate the convection cooling of mist/steam two-phase flow within high temperature turbine blade cooling channels, the effect of Reynolds number,wall heat flux and mist mass flow rate on the temperature distribution and heat transfer coefficient of mist/steam cooled passage wall was studied. The thermal performance of steam and mist/steam was compared under the same conditions. The results show that the average Nusselt number of mist/steam, which is two-phase flow cooling fluid formed by injecting a small amount of fine water droplets into the main steam, is up to 3.46 times the pure steam;When the cooling condition factor is less than 23, significant settlement and large droplets evaporate will be occurred in the central region of mist/steam cooled passage. Then the cooling effect of gas turbine blade internal cooling passage is significantly improved.