Quantitative calculation method of the casing flange leakage based on equivalent clearance
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摘要:
结合平行平板流动理论，结合流量因子法和粗糙面接触压力与接触间隙的关系，提出了一种基于等效间隙、能够考虑微观粗糙形貌及受不均匀分布载荷的机匣安装边泄漏量定量计算方法；采用有限元计算方法，研究了内部气体压力和轴向力对机匣安装边气体泄漏量的影响规律；研究表明，随着内部气体压力的增加，泄漏量增大，随着轴向力的增加，泄漏量略微减小；最后将计算结果与泄漏量实验结果进行对比，在内部气体压力和轴向力作用下的泄漏量最大误差分别为3.5%和3.6%，证明了本文计算方法的有效性。
Abstract:A quantitative calculation method of gas leakage in casing flange considering the rough surface morphology and various distributed loads was proposed by using the parallel plate flow theory, which combined the flow factor method and the relationship between contact pressure and contact gap on the rough surface. The influence of internal gas pressure and axial force on gas leakage in casing flange was studied by finite element method. The results showed that with the increase of internal gas pressure, the leakage increased, and with the increase of axial force, the leakage decreased slightly. Finally, the calculated results were compared with the experimental results of leakage, and the maximum errors of leakage under the action of internal gas pressure and axial force were 3.5% and 3.6%, respectively, which proved the effectiveness of the proposed calculation method.
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Key words:
- casing flange /
- roughness /
- flow factor /
- equivalent clearance /
- leakage experiment
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图 6 不同内部气体压力下安装边单扇区螺栓连接结构接触压力分布
Figure 6. Contact pressure distribution of the single sector bolted structure on the mounting side under different internal gas pressures
图 7 不同轴向力下安装边单扇区螺栓连接结构接触压力分布
Figure 7. Contact pressure distribution of single sector bolted structure on the mounting side under different axial forces
图 8 不同内部气体压力下安装边单扇区螺栓连接结构接触间隙分布
Figure 8. Contact gap distribution of single sector bolted structure on the mounting side under different internal gas pressure
图 9 不同轴向力下安装边单扇区螺栓连接结构接触间隙分布
Figure 9. Contact gap distribution of single sector bolted structure on the mounting side under different axial forces
图 14 内部气体压力对总压分布的影响
Figure 14. Effect of internal gas pressure on total pressure distribution
图 15 内部气体压力对流速分布的影响
Figure 15. Effect of internal gas pressure on flow rate distribution
图 19 轴向力对泄漏量的影响
Figure 19. Effect of axial force internal gas pressure on leakage volume
表 1 机匣安装边有限元模型几何参数
Table 1. Geometric parameters of finite element model of casing flange
mm 参数 数值 机匣长度 100 螺栓处机匣直径 640 机匣内径 740 机匣外径 720 安装边高度 4 
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