环形电极等离子体激励控制透平叶顶间隙泄漏流动研究  

Study on the Turbine Blade Tip Leakage Flow Control Using Ring-Type Plasma Actuation

作　　者：周祚弘 黄明 晏鑫[1] 李志刚[1] 李军[1] ZHOU Zuohong;HUANG Ming;YAN Xin;LI Zhigang;LI Jun(Institute of Turbomachinery,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学叶轮机械研究所,西安710049

出　　处：《西安交通大学学报》2024年第6期128-138,共11页Journal of Xi'an Jiaotong University

基　　金：国家科技重大专项资助项目(J2019-Ⅱ-0011-0031);国家自然科学基金资助项目(51936008)

摘　　要：为探究等离子体激励对叶顶泄漏流动的影响,基于非对称阻挡介质放电等离子体激励的数值模型,提出了环形电极的阻挡介质放电等离子体激励模型。将等离子体激励产生的体积力耦合至雷诺平均Navier-Stokes (RANS)方程组的动量方程中,数值研究了3种等离子体激励电压(9、13、17 kV)和3种激励频率(8、10、12 kHz)的透平叶顶泄漏流动特征。结果表明:环形电极等离子体激励显著改变了叶顶间隙的压力分布,在叶顶间隙内部和叶顶的两侧诱导形成大尺寸涡系结构,阻碍压力侧的主流进入叶顶间隙,有效抑制了动叶叶顶泄漏流动;在激励频率一定时,随着激励电压的增加,叶顶泄漏流动引起的总压损失减弱,但过高的激励电压会造成额外的诱导涡损失;激励电压保持不变,激励频率的增大对叶顶间隙的高压区域无明显影响,而叶顶两侧的诱导涡得到增强并挤压相邻的通道涡,叶栅通道120%轴向弦长处截面的总压损失进一步降低,13 kV激励电压、12 kHz激励频率工况具有最低的总压损失系数,相比无等离子体激励降低了16.12%。研究阐明了等离子体激励电压与激励频率对透平叶顶区域流场以及叶栅气动性能的影响规律。To explore the effect of plasma actuation on tip leakage flow,ring-type dielectric barrier discharge plasma model is proposed based on unsymmetrical electrodes dielectric barrier discharge plasma model in this paper.Blade tip leakage flow characteristics on a gas turbine is numerically studied with three plasma actuation voltage(9,13,17 kV)and three actuation frequency(8,10,12 kHz)by implementing plasma actuation forces into the momentum equations of Reynolds-averaged Navier-Stokes equations.The results show that the pressure distribution has been changed in the tip clearance by ring-type plasma actuation.The mainstream of pressure side is obstructed by strong vortex structure which is generated by plasma actuation in tip clearance and both sides of the tip.The tip leakage flow is suppressed effectively.When the actuation frequency is constant,the total pressure loss caused by the tip leakage flow decreases with the increase of the actuation voltage,but excessively high actuation voltage will cause additional induced vortex loss.When the actuation voltage remains unchanged,the increase of the actuation frequency has little effect on the high pressure region of the tip clearance and the induced vortices on both sides of the tip are enhanced and the adjacent passage vortices are squeezed.The area-average total pressure loss on 120%axial chord passage section is further reduced.The actuation voltage of 13 kV and actuation frequency of 12 kHz has the lowest total pressure loss coefficient on 120%axial chord passage section,which is 16.12%lower than no plasma actuation.The influence law of plasma actuation voltage and actuation frequency on the tip flow characteristics and aerodynamic performance is clarified in this paper.

关 键 词：透平动叶 等离子体激励 叶顶泄漏流 气动性能 

分 类 号：TK474.7[动力工程及工程热物理—动力机械及工程]