在尾迹扰动下高负荷静叶流动的非定常特性  

Research on Unsteady Flow Characteristics of the Highly Loaded Blades Cascade under Wake Interference

作　　者：孙忠民[1] 鞠凤鸣[1] 韩万金[2] SUN Zhong-min;JU Feng-ming;HAN Wan-jin(Harbin Turbine Company Limited, Harbin 150046, China;School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001,China)

机构地区：[1]哈尔滨汽轮机厂有限责任公司,哈尔滨150046 [2]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《汽轮机技术》2018年第1期31-36,共6页Turbine Technology

摘　　要：采用商业软件以及立于转动带子上的圆柱体模拟上游动叶尾迹,数值研究了动叶尾迹对后继高负荷静叶栅流动特性的影响。计算结果表明,其上游动叶栅尾迹的流入是造成后继静叶栅流动非定常性的根源。相对定常计算结果,高负荷叶片的流动参数在尾迹的干扰下发生周期性脉动,叶中的脉动幅值高于两端,尾迹向吸力面附面层"注入"具有较高动量的流体,引发提前转捩,湍流耗散损失超过削弱流动分离趋势造成的损失降低,非定常情况下叶栅总压损失系数高于定常情况。To investigate the influence of the wake interference on the flow in subsequent static cascade with highly loaded blades,the circular cylinder,put on a rotating band,has been used to simulate the rotor wake of the front stage.Results indicate that the unsteady characteristics of the subsequent static cascade are caused by the inflow of the front-stage wake.Comparing with the steady condition,the wake interference causes the periodic fluctuation of flow parameters in the cascade with highly loaded blades and the fluctuation amplitude at mid-span is higher than endwalls.The injection of higher energy fluid by the wake into boundary layer of blade suction surface causes earlier transition at suction side.Yet the turbulent dissipation loss is greater than the loss reduction causedby weakening the flow separation trend.So the total pressure loss coefficient of cascade is higher on unsteady condition.

关 键 词：动叶尾迹 高负荷静叶 动静干扰 非定常流动 数值研究 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]