前置导叶对两种涡轮导向器及涡系结构的影响

为了考察导向叶片对实验涡轮导向器气动性能及涡系结构的影响,采用在实验叶栅前放置前置导叶的方法分别对原型和改型两种涡轮低压导向器进行了低速风洞实验。实验结果表明:增加前置导叶后,两种导向器的总损失分别比不加前置导叶时降低,前置导叶对上、下通道涡强度及位置的影响较大,并导致损失分布及其它气动参数的相应变化。但增加导叶后两种导向器总体性能差不变,仍是改型优于原型。

Effects of front guide blade on performance and vortices structure in two turbine low pressure guide vanes

To investigate the aerodynamic performance effects of front guide blade to test cascade, low speed wind tunnel experiments were carried out on the two LGV cascades with and without front guide blade. Experimental results showed that total pressure loss of the two LGV decreased accordingly when they were mounted the front guide vane, and intensity and position of up and lower passage vortices varied obviously.Thus,the loss distribution changed. The modified design has better performance than the original design all the time with or without front guide blade.