Numerical Simulation of Equilibrium Condensation Two-Phase Flow in Cryogenic Turboexpander

doi:10.7652/xjtuxb201307007

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Numerical Simulation of Equilibrium Condensation Two-Phase Flow in Cryogenic Turboexpander

更新时间：2025-07-09

- Numerical Simulation of Equilibrium Condensation Two-Phase Flow in Cryogenic Turboexpander
- Vol. 47, Issue 7, Pages: 36-39(2013)
- 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：10.7652/xjtuxb201307007
  CLC： TB653
- Online First：10 July 2013，
  
  Published：2013
- 稿件说明：
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Numerical Simulation of Equilibrium Condensation Two-Phase Flow in Cryogenic Turboexpander[J]. 2013, 47(7): 36-39.
DOI：

Numerical Simulation of Equilibrium Condensation Two-Phase Flow in Cryogenic Turboexpander[J]. 2013, 47(7): 36-39. DOI： 10.7652/xjtuxb201307007.

摘要

采用Peng-Robinson方程及零压多项式拟合了低温空气二元混合物的物性

利用商业软件ANSYS CFX对设计工况下的单相流动及进口升压降温后平衡凝结两相流动进行了数值模拟

得到了全低压空气分离流程中的低温两相透平膨胀机喷嘴和工作轮的温度场、压力场、流线及带液量云图

同时推导了该工况下膨胀机的等熵效率。结果表明

工作轮流道内吸力面壁面处的涡流会延迟凝结相变发生

叶片后缘处的尾迹使得吸力面壁面处的带液量有所减小。最后

通过实验验证了模拟结果

表明利用平衡凝结相变模型能够模拟小带液量透平膨胀机流道内的两相流动。该结果可为低温两相膨胀机研究提供参考。

Abstract

The binary mixture properties of cryogenic air were fitted by the PR equations and the zero pressure polynomial. The single-phase flow under the design conditions and the equilibrium condensation of two-phase flow at higher pressure and lower temperature were numerically simulated by ANSYS CFX. For a cryogenic turboexpander in air separation process

the temperature field

pressure field

streamlines and liquid mass fraction in the nozzle and impeller were obtained. The isentropic efficiency of the turboexpander was calculated. The results show that the eddy occurring on the suction side of the impeller would delay the phase-change condensation

and the wake at the trailing edge of the blade would lead to the decrease in the local liquid mass fraction. The simulation results agree well with the experimental data

confirming that the model of the equilibrium condensation can be applied to the simulation of the two-phase flow turboexpander having a small liquid mass fraction.

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references

江楚标. 透平膨胀机及发展动态 [J]. 深冷技术, 2001(5): 1-9.

JIANG Chubiao. Turboexpanders and recent developments [J]. Cryogenic Technology, 2001(5): 1-9.

KEVIN A K. 两相流空气分离透平膨胀机的设计 [J]. 深冷技术, 2010(1): 47-51.

KEVIN A K. Design of two-phase flow air separation turboexpanders [J]. Cryogenic Technology, 2010(1): 47-51.

李瑜, 李亮, 钟刚云, 等. 低压汽轮机中平衡与非平衡凝结流动的对比研究 [C]∥中国工程热物理学会热机气动热力学2009年学术会议论文集. 北京: 中国工程热物理学会, 2009: 1-6.

PENG Dingyu, ROBINSON D B. A new two-constant equation of state [J]. Industrial and Engineering Chemistry, Fundamentals, 1976, 15(1): 59-64.

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DENTON J D, DAWES W N. Computational fluid dynamics for turbomachinery design [J]. Journal of Mechanical Engineering Science, 1998, 213: 107-123.

GHOSH S Kr. A numerical model for the design of a mixed flow cryogenic turbine [J]. International Journal of Engineering, Science and Technology, 2010, 2(1): 175-191.

WHITFIELD A, BAINES N C. Design of radial turbomachines [M]. New York, USA: Longman Scientific Technical, 1990: 68-82.

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