Numerical Study on Effect of Seal Leakage on Performance of Centrifugal Impeller with Low Flow Coefficient

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Numerical Study on Effect of Seal Leakage on Performance of Centrifugal Impeller with Low Flow Coefficient

更新时间：2025-07-09

- Numerical Study on Effect of Seal Leakage on Performance of Centrifugal Impeller with Low Flow Coefficient
- Vol. 44, Issue 11, Pages: 23-27(2010)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK262
- Online First：10 November 2010，
  
  Published：2010
- 稿件说明：
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Numerical Study on Effect of Seal Leakage on Performance of Centrifugal Impeller with Low Flow Coefficient[J]. 2010, 44(11): 23-27.
DOI：

Numerical Study on Effect of Seal Leakage on Performance of Centrifugal Impeller with Low Flow Coefficient[J]. 2010, 44(11): 23-27. DOI：

摘要

在考虑密封泄漏损失的情况下

对小流量二氧化碳离心叶轮进行了三维黏性计算流体动力学分析

对比了考虑密封泄漏前后的计算结果.在设计工况下

叶轮等熵效率下降了8.1%

表明对小流量离心压缩机性能及主流流动结构进行准确的数值预测

必须考虑密封泄漏.为了揭示密封泄漏对离心叶轮性能的影响

通过改变迷宫密封的间隙得到了不同的密封结构

并在设计工况、小流量工况和大流量工况下分别进行了数值分析.结果表明

在一定流量工况下

随着密封间隙的增大

密封泄漏损失系数近似线性增大

离心叶轮等熵效率随之近似线性地下降.

Abstract

The analysis with the three-dimensional viscous computational fluid dynamics(CFD)was carried out for a carbon dioxide centrifugal impeller with a low flow coefficient. The results show that the impeller isentropic efficiency decreases by 8.1 percent at the design mass flow rate with the consideration of the seal leakage compared with that without the consideration of the seal leakage. It is suggested that the seal leakage should be considered in the numerical simulation to predict accurately the performance and the flow in impellers with a low flow coefficient. In order to explore the effect of the seal leakage on the performance of the impeller

the seal clearance was changed and the numerical simulation was performed on the centrifugal impeller with different seal configurations at the low and high mass flow rates as well as the design mass flow rate

respectively. Our results indicate that

at a given mass flow rate

the seal leakage loss coefficient increases and the impeller isentropic efficiency decreases almost linearly with the increase in the seal clearance.

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references

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