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叶片内冷通道中采用汽雾换热或蒸汽换热的实验研究

DOI: 10.13334/j.0258-8013.pcsee.2015.12.017, PP. 3061-3067

Keywords: 燃气轮机,叶片冷却,汽雾冷却,换热特性,实验研究

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Abstract:

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。

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