轴流式多相泵动静叶片轴向间距对压缩级性能的影响

发布时间：2018-01-13 06:14

本文关键词：轴流式多相泵动静叶片轴向间距对压缩级性能的影响　出处：《兰州理工大学》2011年硕士论文　论文类型：学位论文

【摘要】：针对100-YQH第二代样机,利用CFX软件,在多重参考坐标系下,采用欧拉方法描述的两流体模型模拟多相泵压缩级内部三维气液相流场。通过压力场、速度场及气液相分布的分析,探讨了气液混合介质在轴流式多相泵单个压缩级内部的流动规律。研究了动静叶片轴向间隙及压缩级间距对其水利性能的影响规律。对不同动、静叶轴向间隙的单一压缩级以及不同间距的两级压缩级进行全流道三维流动数值模拟。具体研究了不同入口含气率工况下,四个不同动静叶间隙(10 mm、15mm、20mm、30mm)单一压缩级以及三个不同压缩级间距(10mm、15mm、20mm)的两级压缩级的内特性,并分析了不同动、静叶片轴向间隙和不同压缩级间距对扬程、效率及叶片扭矩的影响。结果表明,动静叶片间隙对压缩级扬程、效率及叶片扭矩均有一定影响;间隙过长或过短均会加剧气液分离程度,使扬程减小;增大间隙会减小动静叶片之间的回流,使叶片扭矩减小;效率大小是扬程、叶片扭矩两个因素的综合,在相同入口含气率工况下,效率大小是和Δα值(动叶入口截面含气率与静叶入口截面含气率之差)于叶片转矩的乘积成反比。在所选的4个间隙中,动静叶片轴向间隙为15mm压缩级效率最高。压缩级轴向间距对两级油气混输泵性能存在影响:间距偏长或偏小,也会导致扬程减小,而叶片扭矩基本没受到间距大小变化的影响;三个所选间距中,当间距为15mm时,压缩级效率最高。
[Abstract]:For the 100-YQH second generation prototype, using CFX software, the multiple reference frame, two fluid model is used to simulate the Euler method to describe multiphase pump compression stage internal three-dimensional gas-liquid flow field. Through the analysis of pressure field, velocity field and distribution of gas-liquid phase, discusses the gas-liquid mixing medium in single axial multiphase pump the compression stage internal flow law. The rotor stator axial gap and the law level spacing effect on the compression performance of water.
The different dynamic, static compression level to a single rachis gap and different spacing of the two stage compression level numerical simulation of three dimensional flow. The specific rate was investigated with different conditions of gas entrance, four different blade clearance (10 mm, 15mm, 20mm, 30mm) single compression stage and three different compression level (10mm, 15mm, 20mm space) in the characteristics of the two stage compression level, and analyzes the different dynamic, static blade axial clearance and different compression level spacing on the head, affecting the efficiency and torque of the blade.
The results show that the static blade clearance on the compression head, efficiency and blade torque have a certain impact; the gap is too long or too short will aggravate the gas-liquid separation degree, the lift decreases; gap will decrease reflux increases between the blades, the blade torque decreases; the efficiency is the size of the head, the composite blade torque of the two factors in the the rate of working gas containing the same entrance, the size and efficiency is the value of alpha Delta (blade entrance void ratio and vane entrance void rate difference) product in blade torque is inversely proportional to the gap in 4 selected, and rotor blades axial clearance is 15mm compression level compression efficiency is highest. Level of axial spacing on level two oil-gas pump performance in the presence of influence: spacing too long or small, will also cause the lift decreases, the influence of blade torque not by spacing size change; three selected distance, when the spacing is 15mm, compression efficiency Highest.

【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH312

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