冷却气膜射流对涡轮叶栅气动性能的影响

• 作 者: 张发生 戴韧
• 机 构: 上海理工大学能源与动力工程学院,杭州汽轮机股份有限公司,
• 出 处: 工程热物理学报
• 发表日期: 2011年12期
• 关键词: planar cascade film jets loss coefficient blade wake

本文在平面叶栅风洞上实验测量设计工况下,具有压力面及吸力面单排离散气膜孔射流的导向叶栅下游流场,对比研究不同射流比时叶型损失的变化。实验中主流与射流采用相同的工质。结果表明:压力面射流及吸力面射流时,平均总压损失随射流比的增加均表现出先减小后增大的变化趋势,但是损失增大或减小的数值不同,吸力面射流及压力面射流都会使尾迹区发生改变。高压射流气体的动量和质量对损失数值的影响,在小射流比时可以忽略,但是在大射流比时则必须要考虑,才能准确地反映叶型流动损失。

In this paper, under the condition of experimental measurement and design in a flat cascade wind tunnel, the flow fields downstream of the guide cascade with single-row discrete gas-jet holes on the pressure surface and the suction surface are compared under different experimental conditions. In the experiment, the same working fluid was used in the mainstream and the jet. The results show that when the pressure surface jet and the suction surface jet flow, the average total pressure loss increases with the increase of the jet flow rate, and then decreases with the increase of the jet flow rate. However, the values ​​of the increase or decrease of the jet loss are different. The jet will change the wake area. The influence of momentum and mass of high pressure jet gas on the loss value can be neglected at small jet ratio, but it must be considered in the case of large jet ratio to accurately reflect the leaf flow loss.