摘要
旋转管式分离设备的主分离段一般为变径管结构,针对其内部螺旋流的研究主要集中在平均统计量的分布规律上,缺乏从流动结构角度的描述。本文采用大涡模拟方法对不同旋转条件下变径管内螺旋流开展数值模拟研究,分别以Q准则与基于SVD方法的POD分解法,对数值计算的速度场进行了分析。Q准则等值面显示,螺旋涡从大锥段开始发生破碎,旋转效应能够减弱外涡流区的漩涡强度;POD分解重构后脉动速度场显示,脉动速度场的1阶模态为主模态,包含了湍流的大部分能量,5阶模态之后的流动为由小尺度涡构成的复杂湍动结构。旋转效应抑制了径向涡,促进了轴向涡。从流场结构的角度而言,旋转效应对分离起到了积极的作用。
The main separation section of rotating pipe separation equipment is reducing pipe. The research on spiral flow in reducing pipe mainly focuses on the distribution law of average statistics. In this paper , large eddy simulation method is used to study on spiral flow in a reducing pipe under different rotating conditions. The velocity fieldof numerical calculation is analyzed by Q-criterion and POD decomposition method based on SVD method respectively. The results of Q criterion show that the spiral vortex starts to break from the large cone section , and the rotation effect can weaken the vortex strength in the outer vortex region. The fluctuation velocity field after POD decomposition and reconstruction shows that the firstorder mode of the fluctuation velocity field is the main mode,containing most of the turbul entenergy,and the flow after the fifth order modeisa complex turbulentstruc ture composed of smallscalevortices.The rotationef fectsup presses the radial vortex and promotes the axial vortex.From the point of view of flow field structure,rotation effectplaysa positive role in separation.
作者
张井龙
刘崇江
许红丽
王尊策
ZHANG Jinglong;LIU Chongjiang;XU Hoogli;WANG Zunce(College of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,China;Key Laboratory of Petroleum and Petrochemical Multiphase Media Treatment and Pollution Protection of Heilongjiang,Daqing 163318,China;Daqing Oil Field Co.,LTD.Oil Production Engineering Research Institute,Daqing 163453,China;Geological Brigade,No.1 Oil Production Company,Daqing Oilfield Limited Company,Daqing 163000,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2019年第6期38-45,共8页
Earthquake Engineering and Engineering Dynamics
基金
国家青年科学基金项目(11402051)~~
