涡轮叶片尾缘复合通道中隔板结构对换热特性的影响

The Effect of Different Clapboards Structure in Turbine Blade Trailing Edge Complex Passages on Heat Transfer Characteristics

采用热色液晶测温法,测量了涡轮叶片尾缘带隔板的复合通道的温度场。主要讨论了在通道其它结构均相同的条件下分别采用4种不同结构的隔板(2种孔径的矩形隔板与2种孔径的波形隔板),研究隔板中孔径大小对通道换热和流阻的影响。结果表明:矩形隔板中将矩形隔板上的孔由原来的1.8 mm放大到2.5 mm(即出流孔的总面积放大一倍)后提高了通道的换热,降低了流阻;波形隔板中将隔板由波谷孔径1.5 mm、波峰孔径2.1 mm分别放大到波谷孔径2.1 mm、波峰孔径3.0 mm后对换热没有提高;矩形隔板与波形隔板比较的情况下,波形隔板的换热均高于矩形隔板,而且流阻较低。

The experiment mainly aimed at to investigate the effect of different aperture in different clapboard structure in the turbine blade trailing edge complex passages on heat transfer and pressure drop characteristics. A thermochromic liquid crystal method was used to measure the detailed heat transfer coefficients on the end wall surfaces. Comparison of end wall heat transfer and pressure drop characteristics was made between two kinds of rectangular clapboards and two kinds of waved clapboard in the turbine blade trailing edge complex passages. It was found that the rectangular clapboard with aperture of 2.5 millimeter produces higher heat transfer with relatively less pressure drop than that of the rectangular clapboard with aperture of 1.8 millimeter; the heat transfer of the waved clapboard with aperture 1.5 millimeter in trough and aperture 2.1 millimeter on ridge was higher than that of the waved clapboard with aperture 2.1 millimeter in trough and aperture 3.0 millimeter on ridge. Comparing the four structures,the two waved clapboards performed the higher endwall-averaged heat transfer and in the meanwhile pay the lower pressure drop penalty than the two rectangular clapboards.