摘要
采用数值模拟的方法研究了在上游尾迹干扰下大焓降叶片流场的非定常性以及端壁翘曲对端壁区流动的控制效果。上游动叶尾迹用转动的圆柱模拟,在基准工况下计算了具有平坦端壁和翘曲端壁的两套大焓降叶栅。结果表明:在上游尾迹的周期干扰下,叶片表面附面层,主要是吸力面附面层参数表现出周期性脉动。在上游尾迹周期作用的非定常环境下,相对平坦端壁,端壁翘曲降低了端壁通道涡量,降低了端区流动损失。
Numerical simulation method was used to study the unsteady flow characteristics and the effect of warp end wall on the end wall flow. The upstream wakes of rotor blades were simulated with a rotating cylinder. Two cascades with the non-axial symmetry end wall and the flap end wall respectively were simulated in the baseline conditions. Results show that periodic pulsations of boundary layer parameters are mainly focused on the suction side under the effect of the upstream wake. Compared to the flap end wall, the non-axial symmetry end wall is able to decrease the end wall channel vortices, and further reduces the end wall channel energy loss with the unsteady upstream wake.
出处
《汽轮机技术》
北大核心
2015年第6期422-424,428,共4页
Turbine Technology
关键词
大焓降叶片
非轴对称端壁
尾迹干扰
非定常数值模拟
high-loading blade
non-axial symmetry endwall
weak disturbing
unsteady numerical simulation
