论文部分内容阅读
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。
Gas (steam) fog cooling blade is a new generation of efficient blade cooling technology is an important development direction, has broad application prospects and development potential. The influence of Reynolds number, wall heat flux and water mist mass flow on the wall temperature distribution and heat transfer coefficient of the aerosol cooling channel were studied on the experiment platform of convection cooling of gas (vapor) And with the same conditions of steam heat transfer performance comparison. The main results show that spraying a small amount of small droplets into the mainstream steam to form a vapor-phase two-phase flow cooling medium can increase the average Nusselt number to 3.46 times that of pure steam. When the cooling condition factor is less than 23, Significant droplet deposition and evaporation will occur in the middle of the channel with a significant increase in cooling.