有无蜂窝的直通斜齿流动特性旋转实验研究

Experimental Study on Rotation on Flow Characteristics of Straight-Through Inclined Tooth with or Without Honeycomb

关键词:  篦齿封严  直通斜齿  蜂窝衬套  流动特性  旋转

Key words:  Labyrinth seal  Straight-through inclined tooth  Honeycomb bushing  Flow characteristic  Rotation

摘要:

为了研究蜂窝对直通斜齿流动特性的影响，在光滑衬套和蜂窝衬套条件下的高速旋转篦齿实验台上，分别测量了工作间隙和流动特性随转速0~8700r/min和压比1.1~1.5的变化规律。实验结果表明：随着转速的增加，泄漏量下降了约50%，流量系数下降了约25%，风阻温升达到40K；随着压比的增加，泄漏量和流量系数也相应增加；蜂窝衬套相对于光滑衬套，流量下降了约20%，流量系数下降了约10%，风阻温升差异微小。蜂窝可以使篦齿流量及流量系数降低，提升封严性能，对风阻温升影响很小。

Abstract:

In order to study the effects of honeycomb on the flow characteristics of straight-through inclined tooth, the variation of working clearance and discharge characteristics with rotational speed 0~8700r/min and pressure ratio 1.1~1.5 were measured on the experiment rig of a high-speed rotating labyrinth under the cases with smooth bushing and honeycomb bushing. The experimental results show that with the increase of the rotational speed, the leakage flow decreases by about 50%, the discharge coefficient decreases by about 25%, and the windage heating rises to 40K. As the pressure ratio increases, the leakage flow and the discharge coefficient increase accordingly. With respect to the smooth bushing case, the mass flow rate with honeycomb bushing decreases by about 20%, the discharge coefficient drops by about 10%, and the difference of windage heating is slight. Honeycomb can reduce the mass flow rate and discharge coefficient of the labyrinth seal， and improve the sealing performance， and have little effect on the windage heating.