主泵用静压机械密封的流场数值分析

发布时间：2018-01-08 08:35

本文关键词：主泵用静压机械密封的流场数值分析　出处：《西华大学》2011年硕士论文　论文类型：学位论文

【摘要】：随着人类文明的进步和全球经济的不断发展,人类对能源的需求也在不断扩大,寻找到清洁、安全、高效、可靠的新能源是人类文明发展的必由之路。核能经过半个世纪的发展,技术日趋成熟,在军、民领域都得到了广泛应用。本文对核电站主泵中的轴封装置进行了研究,主要针对一级静压式密封中的流场进行分析。从理论分析和数值计算模拟两个方面对密封流场进行了研究,得出了密封端面几何参数和密封操作参数等对密封性能的影响。具体说来包含以下几个方面: (1)静压式机械密封的原理介绍。简单说明了机械密封的发展状况和相关应用情况,主要对静压式机械密封进行了介绍。着重对主泵密封中使用的收敛锥面型静压密封进行了详细说明,分析了其结构特点和成膜原理,随后通过图示说明了密封的动态工作原理。 (2)流体力学的研究方法介绍,建立简化了的流动控制方程。对流动的控制方程(N—S方程)进行了说明,并引出了对其简化的方式。通过分析平行平面间隙内黏性流动和对雷诺方程的推导过程,进一步阐明了流动的控制方程的物理意义和简化方式,最后将密封流场的流动简化为平面形式,并建立了其相应的运动控制方程。对控制方程的数值求解方法进行了说明,阐述了有限体积法的原理和计算过程,并简单介绍了离散控制方程的求解方法。 (3)密封流场的CFD分析。分析密封结构特点,根据工程应用中的实际情况确定密封的各主要形状参数和操作参数,建立二维的密封数值计算模型。使用商用CFD软件FLUENT对密封间隙内的流场进行数值模拟分析,通过变化参数的手段研究端面结构参数和操作参数对密封性能的影响。将计算结果汇总并以曲线的形式描绘出来,以观察其变化规律。 (4)流场内的热分布规律研究。分析了密封内的主要产热、散热因素,建立密封流场在柱坐标系下的理论运动控制方程和能量控制方程。使用FLUENT软件对流场进行数值模拟,得出流场内的温度分布规律,并讨论热变形对密封的影响。本文主要通过数值计算的方式,对主泵用静压式机械密封内的流场进行模拟。分析了各种形状参数和操作参数对密封性能的影响,为进一步的研究工作和密封的设计提供一定的参考。
[Abstract]:With the continuous progress of human civilization and the development of the global economy, the energy demand is growing, to find a clean, safe, efficient and reliable new energy is the only way which must be passed in the development of human civilization. Nuclear power after half a century of development, technology matures, in the military, civilian areas have been widely used.
This article has conducted the research to the seal device of nuclear power plant primary pump, mainly for flow field of one hydrostatic seal were analyzed. From the theoretical analysis and numerical simulation of two aspects of the research on the flow field obtained seal seal, geometric parameters and operating parameters of sealing effect on the seal performance specifically. Include the following aspects:
(1) introduced the principle of hydrostatic mechanical seal. A brief description of the development status of the mechanical seal and the related application, the hydrostatic seal is introduced. Focusing on the convergence of the cone type hydrostatic main pump is used for sealing of detail, analyzes its structure characteristics and principle of film, then by illustrating the principle of dynamic seal.
(2) introduces the research method of fluid mechanics, a simplified flow control equation. The flow control equations (N S equation) are described, and leads to the simplifying method. Through the analysis of the viscous flow between two parallel plates and the derivation of the Reynolds equation, and further clarified the physical meaning of control the flow equation and simplified way, the seal flow field is simplified as a plane form, and established the corresponding equations. The numerical method for solving the control equations are described, explained the finite volume method principle and calculation process, and introduces the method to solve the discrete equations.
(3) CFD analysis of the flow field. Analysis of the sealing structure, sealing the shape parameters and operating parameters are determined according to the actual situation of engineering application, a two-dimensional numerical model of the seal. Using the commercial CFD software FLUENT based on the numerical simulation of the seal gap flow field, by changing the parameters of the influence of surface structure means study on the parameters and operating parameters on the sealing performance. The results will be summarized and depicted in the form of curves, to observe its change.
(4) analysis of the heat distribution. The analysis is mainly produced in the heat sealing, heat dissipation factor, establish the theory motion flow field in cylindrical coordinates and energy control equations. Using the FLUENT software of flow field numerical simulation, obtains the temperature distribution in flow field, and discusses the thermal deformation of the seal the impact.
In this paper, the flow field in the hydrostatic mechanical seal of the main pump is simulated by numerical calculation. The influence of various shape parameters and operation parameters on the sealing performance is analyzed, providing a reference for further research and seal design.

【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH136

【参考文献】