超临界CO<sub>2</sub>透平机主轴冷却装置静动态特性分析

郑培培; 李伦; 李济顺; GURGENCIHal; 李俊; 陈稳; 许世钰

doi:10.13433/j.cnki.1003-8728.20200213

超临界CO₂透平机主轴冷却装置静动态特性分析

doi: 10.13433/j.cnki.1003-8728.20200213

郑培培^{1, 2,},
李伦^{1, 2, ,},
李济顺^{1, 2},
GURGENCIHal³,
李俊^{1, 2},
陈稳^{1, 2},
许世钰^{1, 2}

1.
河南科技大学河南省机械设计及传动系统重点实验室，河南洛阳　471003
2.
河南科技大学机电工程学院，河南洛阳　471003
3.
昆士兰大学机械与采矿工程学院，澳大利亚布里斯班　4072

基金项目: 2018河南省引智项目（杰出外籍科学家工作室）（GZS2018005）

详细信息

作者简介:
郑培培（1989−），硕士研究生，研究方向为超临界CO₂润滑、冷却，ppz1204@foxmail.com

通讯作者:
李伦，高级工程师，硕士生导师，博士，lilunxn@163.com

中图分类号: TH133; TK514
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- 被引次数: 0
出版历程
- 收稿日期: 2019-11-16
- 网络出版日期: 2021-04-15
- 刊出日期: 2021-10-18

Analyzing Static and Dynamic Characteristics of Supercritical CO₂ Turbine Shaft Cooling Device

ZHENG Peipei^{1, 2
,},
LI Lun^{1, 2
, ,},
LI Jishun^{1, 2},
GURGENCI Hal³,
LI Jun^{1, 2},
CHEN Wen^{1, 2},
XU Shiyu^{1, 2}

1.
Henan Key Laboratory for Machinery Design and Transmission System, Henan University of Science and Technology, Luoyang 471003, He′ nan, China
2.
School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, He′ nan, China
3.
School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, QLD 4072, Australia

摘要

摘要: 以超临界二氧化碳（_SCO₂）透平机主轴冷却装置为研究对象，基于流体域圆柱曲面展开法建立了流体域压力分布的数学模型，推导出压力分布及承载力的函数表达式；采用CFD分析方法，针对进气压力、主轴转速、偏心率等不同条件下的流场压力、承载力、刚度进行了分析研究。研究结果表明：主轴低速对气膜压力影响极小，轴向压力以冷却装置轴向中心截面呈对称分布；相同偏心率下，承载力随进气压力的提高而增大；进气压力恒定条件下，气膜承载力随偏心率的增大逐渐增大；冷却装置刚度与偏心率呈非线性关系，随偏心率的增大，冷却装置刚度增大，到达极值点后开始减小，极值点出现在偏心率0.35位置。
- 超临界二氧化碳(_SCO₂) /
- 冷却装置 /
- 压力场 /
- 承载力 /
- 刚度
Abstract: The supercritical carbon dioxide (_SCO₂) turbine main shaft cooling device was studied. The mathematical model of pressure distribution in the fluid domain was established with the cylindrical surface expansion method. The functional expressions of pressure distribution and bearing capacity were deduced. The computational fluid dynamics (CFD) method was used to analyse the flow field pressure, bearing capacity and stiffness under different conditions such as inlet pressure, rotation speed and eccentricity. The results show that the low speed of the main shaft has little influence on the film pressure and that the axial pressure is symmetrically distributed along the axial central section of the cooling device. Under the same eccentricity, the bearing capacity increases with the increase of intake pressure; under the condition of constant inlet pressure, the bearing capacity of the film increases with the increase of eccentricity. The stiffness and eccentricity of the cooling device are non-linear. The stiffness of the cooling device increases with the increase of eccentricity and begins to decrease after reaching the limit point, and the extreme point appears at the eccentricity of 0.35.
- supercritical carbon dioxide (_SCO₂) /
- cooling device /
- pressure field /
- bearing capacity /
- stiffness

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图 1 _SCO₂主轴冷却装置结构

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图 2 冷却装置流体域展开厚度分布示意图

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图 3 第i等份弧长压力分布

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图 4 冷却装置流体域三维模型及网格

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图 5 不同压力下_SCO₂密度、比热容、导热系数、黏度拟合曲线图

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图 6 不同偏心率、压力下气膜压力分布云图

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图 7 z=L/2位置圆周压力分布曲线

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图 8 不同偏心率、转速下气膜压力分布云图

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图 9 不同偏心率、转速下，z=L/2位置圆周压力分布

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图 10 气膜承载力变化曲线

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图 11 冷却装置刚度变化曲线

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表 1 冷却装置结构参数

参数及单位	数值
长度 L/mm	30
主轴直径 2R/mm	30
进气节流孔直径 d/mm	2
平均气膜间隙 h₀/mm	0.5
节流孔与端面距离 l/mm	15
节流孔排数	1

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表 2 数值仿真计算工况

参数及单位	参数
进气口压力P/MPa	7.0，7.5，8.0，8.5，9.0
出气口压力p₀/MPa	0.1
进气温度/K	310
主轴偏心率	0，0.1，0.2，0.3，0.4，0.5
主轴转速/10³(r·min⁻¹)	0，2，4，6，8，10

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表 3 不同网格数量承载力对比

压力P/MPa	偏心率	承载力W/N
压力P/MPa	偏心率	20万网格	40万网格	66万网格	92万网格
7.5	0.1	204.5	186.05	142.89	145.63
	0.3	599.1	531.74	363.99	362.05
	0.5	818.2	670.10	639.24	645.75
8.5	0.1	202.2	198.67	152.56	150.64
	0.3	641.3	575.9	405.93	404.89
	0.5	924.5	778.42	749.14	744.34

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