Analysis on flow field characteristics of a new type of labyrinth control valve

DONG Xuelian; LUO Hao; ZHOU Rong; LIAO Jiamin; FEI Ling

doi:10.19666/j.rlfd.201801002

English

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Analysis on flow field characteristics of a new type of labyrinth control valve

Thermal Power Generation Vol. 47, Issue 10, Pages: 66-72(2018)

更新时间：2025-09-28

- Analysis on flow field characteristics of a new type of labyrinth control valve
- 作者机构：
  
  西华大学机械工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201801002
  CLC： TH138.52
- Published Online：28 September 2018，
  
  Published：2018
- 稿件说明：
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DONG Xuelian, LUO Hao, ZHOU Rong, et al. Analysis on flow field characteristics of a new type of labyrinth control valve[J]. Thermal Power Generation, 2018, 47(10): 66-72.
DOI：

DONG Xuelian, LUO Hao, ZHOU Rong, et al. Analysis on flow field characteristics of a new type of labyrinth control valve[J]. Thermal Power Generation, 2018, 47(10): 66-72. DOI： 10.19666/j.rlfd.201801002.

摘要

迷宫式调节阀是超(超)临界机组直流锅炉给水旁路系统中重要部件

迷宫流道的类型和结构参数是设计迷宫式调节阀的关键

直接影响阀门内流场的分布。本文基于传统分流式和对冲式流道的流动特点

提出了一种新型碟片结构

通过CFX软件数值模拟

研究新型碟片结构在不同结构参数下阀门内流场的分布特性。结果表明:新型碟片结构具有较好的流量特性和流阻特性

流通能力优良

能够满足阀门的工作要求;碟片结构参数中

随流道深度增加

出口平均压力降低

流量和出口平均速度均呈增加趋势;随流道倒角增大

流量和出口平均速度增加

出口平均压力减小

并会使部分区域出现空化现象;随对冲流道宽度和进口宽度、出口宽度增大

流量增大

出口平均压力和速度呈下降趋势;流道深度及流道倒角对流场影响较大

对冲流道宽度和进口宽度、出口宽度的变化对阀门流场的影响程度有限。

Abstract

The labyrinth control valve is one of the important components of the feedwater bypass system of oncethrough boiler in the supercritical(ultra-supercritical) unit. The type and structural parameters of the labyrinth runner are the key to designing the labyrinth control valves

which directly affect the flow field distribution in the valve. On the basis of flow characteristics of the conventional divided-flow and hedge-type runner

a new disc structure is proposed in this paper. In addition

through numerical simulation by the CFX software

the flow field distribution characteristics of the valve with new disc structure and different structural parameters are studied. The results show that

the new disc structure has good flow characteristics

flow resistance characteristics and flow capacity

which can meet the requirements of the valve. In the disc structure parameters

with the increase of the runner depth

the average outlet pressure decreases

and the flow rate and the average outlet velocity increase. With the increase of the runner chamfer

the flow rate and the average outlet velocity increases

while the average outlet pressure decreases and the cavitation occurs in some areas. Furthermore

with the increase of the width of the hedgetype runner and the width of inlet runners and outlet runners

the flow rate increases

and the average outlet pressure and speed show a downward trend. The depth and the chamfer of the runner have a great influence on the flow field

while the effect of the width of the hedge-type runner

the width of the inlet runners

and the width of the outlet runners on the flow field of the valve is limit.

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