跨声速级不同转速下静叶的损失特性

Loss characteristic of stator under different rotational speeds in transonic stage environment

为讨论不同转速下静叶的气动及损失特性,在0.9倍设计转速下对某跨声速单级压气机进行了试验测量,获得了级特性曲线并对数值计算方法进行了校核。利用校核后的数值软件对0.7~1.1倍设计转速下压气机静叶内部流场进行了详细的数值研究,探讨了转速变化对静叶内部流场结构的影响机制,分析了流场结构与损失分布的关联性,对比了不同损失评价标准并给出了各自对于叶片优化设计的指导意义。结果表明:随着转速的增加静叶顶部流场持续恶化,而叶根和叶中流场变化较小;流道内的旋涡和压力梯度输运了低能流体团,造成了低能流体在流场中的积聚而形成高损失区。

To investigate the aerodynamic and loss characteristics of stator in transonic stage environment at different rotational speeds, the characteristics of a transonic single stage compressor at 0.9 times of design rotational speed was obtained by a method of experi- mental investigation. Detailed numerical results in the stator passage were obtained in a range from 0.7 to 1.1 times of design rotational speed with validated numerical methods. The impact mechanism of rotational speed on the stator flow field structure was explored. The association between flow field structure and loss distribution were analyzed. Two kinds of loss criteria were compared, and their guidance to the blade optimized design was given. The results show that, as the rotational speed grows, the flow field structure in the top re- gion of stator getting worse, which changes little in the middle and hub regions. Vortices and pressure gradient perform as the driving forces in the transportation of low-energy fluid in the flow passage, resulting in the low-energy fluid gathering, thereby making up a high- energy-loss area.