摘要
采用数值模拟的方法研究了动叶尾迹对跨声速压气机设计工况下静叶表面和下端壁分离结构的非定常影响规律。首先,采用Rotor37的实验结果验证了数值模拟方法的可靠性。通过对跨声速压气机设计工况的计算,认为定常计算和非定常计算的结果整体上是相似的,非定常计算考虑了动叶尾迹对静叶流场的影响。研究表明,动叶尾迹在向下游输运过程中经历了拉伸、扭曲、积聚和耗散的过程。动叶尾迹使动静叶交界面气流角发生周期性波动。动叶尾迹的扫掠,使静叶前缘闭式分离区域范围发生先增大后减小的周期性波动,使静叶尾缘分离形式呈现由闭式分离向开式分离的周期性转化。动叶尾迹的扫掠在马蹄涡吸力面分支前诱导出一个小尺度的旋涡,并使得静叶根部尾缘和下端壁角区处的螺旋点拓扑结构呈周期性变化。动叶尾迹的扫掠使得静叶压力面的局部高静压区发生周期性的迁移。
A numerical simulation was performed to analyze the unsteady effect of the rotor wake to the separation structures on the static blade surface and hub of the transonic compressor under the design condition.Firstly,employing the experimental results of Rotor 37,the reliability of the numerical simulation methods are verified.By the calculation of the transonic compressor under the design condition,the results of the steady and unsteady methods are similar on the whole,but the unsteady calculations consider the effects of rotor wake on stator flow.Study shows that the rotor wake has been stretched,distorted,accumulated and dissipated in the process of transportation.The rotor wake forces the flow angle to be periodical fluctuating at the interface of rotor and stator.Because of the scanning of the rotor wake,the area of the closed separation at the stator leading edge occurs firstly increasing and then decreasing as a periodical fluctuation,and the form of separation at the stator trailing edge transforms from the closed separation to open separation periodically.The scanning of the rotor wake induces out of a small vortex in front of the suction side of the horseshoe vortex,and makes the topological structure of a couple of spiral points at the corner between the root of the stator trailing edge and the hub to be changed periodically.The scanning of the rotor wake makes the area of high hydrostatic pressure at the stator pressure side to occur periodically migration.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第4期744-751,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金青年基金项目(No.51206013)
国家自然科学基金重点项目(No.51436002)
高等学校博士学科点专项科研基金(No.20112125120009)
中央高校基本科研业务费专项资金(No.3132014319
No.3132014049)
全国优秀博士学位论文培育基金(No.2014YB07)
关键词
跨声速压气机
非定常计算
动叶尾迹
静叶表面
分离结构
transonic compressor
unsteady simulation
rotor wake
static blade surface
separation structure
