Numerical Simulation and Experimental Test of Thermal Performance of a Cryogenic Helium Turbine Expander

ZHANG Ze; ZHOU Kaimiao; DENG Kunyu; CHEN Xingya; CHEN Shuangtao; HOU Yu

doi:10.7652/xjtuxb202402011

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Numerical Simulation and Experimental Test of Thermal Performance of a Cryogenic Helium Turbine Expander

更新时间：2025-05-13

- Numerical Simulation and Experimental Test of Thermal Performance of a Cryogenic Helium Turbine Expander
- Vol. 58, Issue 2, Pages: 109-115(2024)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 西安交通大学深低温技术与装备教育部重点实验室,西安,710049
  3. 东北电力大学能源与动力工程学院,吉林,吉林,132012
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202402011
  CLC： TB653
- Online First：10 February 2024，
  
  Published：2024
- 稿件说明：
移动端阅览
ZHANG Ze, ZHOU Kaimiao, DENG Kunyu, et al. Numerical Simulation and Experimental Test of Thermal Performance of a Cryogenic Helium Turbine Expander[J]. 2024, 58(2): 109-115.
DOI：

ZHANG Ze, ZHOU Kaimiao, DENG Kunyu, et al. Numerical Simulation and Experimental Test of Thermal Performance of a Cryogenic Helium Turbine Expander[J]. 2024, 58(2): 109-115. DOI： 10.7652/xjtuxb202402011.

摘要

为了深入研究氦透平膨胀机在降温过程及低温条件下的热力学特性

依托ADS 500 W/4.5 K低温制冷机建设了80 K温区的实验系统

进行了氦透平膨胀机的低温变工况测试。测试的氦透平膨胀机主轴轴径为12.00 mm

采用动压氦气体轴承支承

最高转速可以达到252 130 r·min

-1

。在膨胀比为1.88时

膨胀机最大出口温降达到8.1 K; 在膨胀比为2.07时

等熵效率达到最高值71.2%。以实验用氦透平膨胀机尺寸及测试工况为基础

建立了透平的数值模型。采用商业软件ANSYS CFX对透平的热力性能及降温特性进行了数值模拟

得到了相应的理论温降曲线。研究结果表明:所建数值模型能够较好地预测该氦透平膨胀机的温降过程

膨胀机出口温度的实验值和计算值结果最大相对偏差为0.45%; 所测试的低温氦透平具有优良的热力性能和降温特性

测试的动压氦气体轴承表现出良好的支承稳定性

数值计算和实验结果可为后续相关研究和大科学装置的应用提供参考。

Abstract

In order to conduct an in-depth study on the thermodynamic characteristics of the helium turbine expander during the cooling process and under low temperature conditions

an experimental system in the 80 K temperature range based on the ADS 500 W/4.5 K cryogenic refrigerator is constructed to conduct the low-temperature variable condition testing of helium turbine expander. The main shaft diameter of the tested helium turbine expander is 12.00 mm. The expander is supported by compliant foil bearings

and can reach a maximum rotational speed of 252 130 r·min

-1

. The maximum outlet temperature drop of the expander is 8.1 K when the expansion ratio is 1

.88. When the expansion ratio is 2.07

the maximum isentropic efficiency reaches 71.2%. The numerical model of the tested helium turbine expander is established based on its dimensions and test conditions. The thermal performance and cooling characteristics of the turbine are simulated by using commercial software ANSYS CFX

and the corresponding theoretical temperature drop curve is obtained. The results show that the numerical model can predict the temperature drop process of the expander well

and the maximum relative deviation between the experimental value and the numerical calculation result is 0.45%. The tested helium turbine has good thermal performance and cooling characteristics

and the tested dynamic pressure helium gas bearing shows good stability. The numerical calculation and experimental results can provide reference for followed relevant researches and the application of large devices for scientific studies.

关键词

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