Calculation of the Critical Speed and Stability Analysis of Cryogenic Turboexpanders with Different Structures

CHEN Shuangtao (陈双涛); ZHAO Hongli (赵红利); MA Bin (马斌); HOU Yu (侯予)

doi:10.1088/1009-0630/14/10/12

Plasma Science and Technology > 2012 > 14(10): 919-926. > DOI: 10.1088/1009-0630/14/10/12

CHEN Shuangtao (陈双涛), ZHAO Hongli (赵红利), MA Bin (马斌), HOU Yu (侯予). Calculation of the Critical Speed and Stability Analysis of Cryogenic Turboexpanders with Different Structures[J]. Plasma Science and Technology, 2012, 14(10): 919-926. DOI: 10.1088/1009-0630/14/10/12

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Calculation of the Critical Speed and Stability Analysis of Cryogenic Turboexpanders with Different Structures

1 State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, 710049, PR China

Funds: partially supported by the Open Research Project of Key Laboratory of Cryogenics, TIPC, CAS (CRYO201125), National Nature Science Foundation of China (50976082), NSAF (No 11176023) and the National Basic Research Program of China (2011CB706505).

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Received Date: May 08, 2011

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Abstract

Abstract

A modularized code based on the Finite Element QZ (FEQZ) method is developed, for a better estimate of the critical speed and a more convenient method of rotor-dynamic stability analysis for a gas bearing high speed turboexpander rotor system with actual structure and application of a cryogenic turboexpander. This code is then validated by the experimental data of a gas bearing turboexpander, with a rotor diameter of 25mm and a rated speed of 106,400 rpm. With this code, four rotors with different structures, available to the turboexpander, are parametrically analyzed by the available speed range, vibration modes and logarithmic attenuation rate. The results suggest that the rotor with a structure of two thrust collars on the system exhibits a better performance in the designed conditions.
- critical speed,
- gas bearing,
- cryogenic turboexpander

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[1]	Qingfeng JIANG (蒋庆峰), Zhigang ZHU (朱志刚), Qiyong ZHANG (张启勇), Ming ZHUANG (庄明), Xiaofei LU (陆小飞). Optimal design of the first stage of the plate-fin heat exchanger for the EAST cryogenic system[J]. Plasma Science and Technology, 2018, 20(3): 35601-035601. DOI: 10.1088/2058-6272/aa969f
[2]	Zhigang ZHU (朱志刚), Qiyong ZHANG (张启勇), Yuntao SONG (宋云涛), Ming ZHUANG (庄明), Zhiwei ZHOU (周芷伟), Anyi CHENG (成安义), Ping ZHU (朱平). Present status and one upgrading method with a cold compressor of the EAST sub-cooling helium cryogenic system[J]. Plasma Science and Technology, 2017, 19(5): 55603-055603. DOI: 10.1088/2058-6272/aa58da
[3]	Tianwei LAI (赖天伟), Bao FU (付豹), Shuangtao CHEN (陈双涛), Qiyong ZHANG (张启勇), Yu HOU (侯予). Numerical analysis of the static performance of an annular aerostatic gas thrust bearing applied in the cryogenic turbo-expander of the EAST subsystem[J]. Plasma Science and Technology, 2017, 19(2): 25604-025604. DOI: 10.1088/2058-6272/19/2/025604
[4]	CHEN Shuangtao (陈双涛), YANG Shanju (杨山举), FU Bao (付豹), et al.. Study on the Dynamic Performance of the Helium Turboexpander for EAST Subsystems[J]. Plasma Science and Technology, 2015, 17(6): 517-523. DOI: 10.1088/1009-0630/17/6/13
[5]	FU Bao(付豹), ZHANG Qiyong(张启勇), ZHU Ping(朱平), CHENG Anyi(成安义). The Application and Improvement of Helium Turbines in the EAST Cryogenic System[J]. Plasma Science and Technology, 2014, 16(5): 527-531. DOI: 10.1088/1009-0630/16/5/14
[6]	XIA Donghui (夏冬辉), HUANG Mei (黄梅), ZHOU Jun (周俊), et al.. The 5.8 T Cryogen-Free Gyrotron Superconducting Magnet System on HL-2A[J]. Plasma Science and Technology, 2014, 16(4): 410-414. DOI: 10.1088/1009-0630/16/4/20
[7]	WANG Teng (王腾), GAO Xiangdong (高向东), Katayama SEIJI. Analysis of Laser-Induced Plume During Disk Laser Welding at Different Speeds[J]. Plasma Science and Technology, 2013, 15(8): 821-824. DOI: 10.1088/1009-0630/15/8/20
[8]	WU Cheng (吴诚), PAN Wanjiang (潘皖江). Research and Analysis on Tensile and Compressive Fatigue Performance of Cryogenic Axial Insulation Breaks[J]. Plasma Science and Technology, 2013, 15(7): 716-720. DOI: 10.1088/1009-0630/15/7/20
[9]	QIU Lilong (邱立龙), ZHUANG Ming (庄明), MAO Jin (毛晋), HU Liangbing (胡良兵), SHENG Linhai (盛林海). Optimization analysis and simulation of the EAST cryogenic system[J]. Plasma Science and Technology, 2012, 14(11): 1030-1034. DOI: 10.1088/1009-0630/14/11/13
[10]	WANG Xuemin, ZHUANG Ming, ZHANG Qiyong, LI Shanshan, FU Bao. Dynamic Stability Study of Static Gas Bearing for Small Cryogenic Turbo-Expander[J]. Plasma Science and Technology, 2011, 13(4): 506-512.