不同攻角下双孔射流旋涡发生器对高速扩压叶栅端区流动的影响

发布时间：2018-05-16 03:19

本文选题：高速扩压叶栅 + 射流旋涡　；参考：《推进技术》2017年11期

【摘要】：为了探究不同攻角下单孔以及双孔射流旋涡发生器(VGJs)对高速扩压叶栅气动性能的影响和作用机理,采用数值模拟的方法对栅内气动性能参数以及端区流动分布进行了较为详细的分析。数值结果表明:单孔以及同向双孔射流均具有较好的变攻角特性,随着攻角的增加控制效果先显著增加然后略微降低,在2°攻角条件下,VGJs使得总压损失降低最为明显,单孔射流达到11.0%。反向双孔射流的控制效果较差,在-4°攻角条件下甚至出现了3.9%的总压损失增长。采用射流旋涡发生器,射流旋涡(JV)将通道涡分成两部分,靠近吸力面的次生通道涡(PVⅡ)很快汇入角区,端壁展向涡(SV)消失,吸力面分离被推迟,但吸力面上的展向运动显著增强,叶栅通道内的二次流动得到有效控制。
[Abstract]:In order to investigate the effect and mechanism of VGJs on the aerodynamic performance of high-speed diffuser cascade at different angles of attack, a single hole and two hole jet vortex generator (VGJs) is proposed. The aerodynamic performance parameters and the end flow distribution in the gate are analyzed in detail by numerical simulation. The numerical results show that both single-hole and codirectional double-hole jets have better characteristics of variable angle of attack. With the increase of angle of attack, the control effect increases significantly and then decreases slightly. VGJs make the total pressure loss decrease most obviously under the condition of 2 掳angle of attack. The single hole jet reaches 11.0. The control effect of the reverse double-hole jet is poor, and the total pressure loss increases by 3.9% under the condition of -4 掳angle of attack. Using a jet vortex generator (JV), the passage vortex is divided into two parts. The secondary channel vortex PVII near the suction surface quickly converges into the corner region, the end wall spanned vortex SVV) disappears, and the suction surface separation is delayed. However, the spanned motion on the suction surface is enhanced significantly, and the secondary flow in the cascade channel is effectively controlled.
【作者单位】：哈尔滨工业大学能源科学与工程学院;
【基金】：国家自然科学基金(51306042)
【分类号】：TH45

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