疏水阀气液两相流冲蚀特性模拟和结构优化
发布时间：2018-08-27 19:40
【摘要】：液滴冲蚀指的是材料受到小而松散的液滴颗粒冲击时表面出现破坏的一类损耗现象,同时也是气动疏水阀等设备的表面损伤主要形式之一。蒸汽管路中的凝结水,在高速流动的蒸汽推动下,会对阀门或使用蒸汽的设备产生强烈的撞击,从而造成阀门等设备的冲蚀损伤或破坏,减小设备的使用寿命。基于此,本文研究气动疏水阀内气液两相流的冲蚀特性,提出减弱冲蚀损伤的办法具有重要的工程价值和理论价值。本文以SY4500气动疏水阀为研究对象,采用ICEM软件对其流道模型进行整体结构网格划分,使用CFX软件中的Eulerian-Lagrangian多相流粒子追踪模型和SST k-w湍流模型进行流场模拟。在对网格进行无关性验证基础上,研究液滴在阀门内的液滴运行轨迹,分析阀门表面容易损伤的部位。调用两相流流场仿真的分析结果,采用了显式动力学软件LS-DYNA分析液滴撞击靶板的应力应变,比较不同工况下阀内各个部位的抗冲蚀特性。最后,根据上述两相流流场模拟结果和动力学仿真结果,得到了降低液滴的法向速度可以有效的减少该气动疏水阀的冲蚀磨损的结论,并优化设计了一种新型的多级对冲式结构,提高疏水阀的抗冲蚀特性。
[Abstract]:Droplet erosion refers to a kind of loss phenomenon when the material is impacted by small and loose droplet particles. It is also one of the main forms of surface damage of pneumatic trap and other equipment. The condensate water in steam pipe will strongly impact the valve or the equipment using steam under the push of high speed steam flow, which will cause erosion damage or damage to the equipment such as valve, and reduce the service life of the equipment. Based on this, the erosion characteristics of gas-liquid two-phase flow in pneumatic trap are studied in this paper, and the method of reducing erosion damage has important engineering value and theoretical value. In this paper, the SY4500 pneumatic trap is used as the research object, and the flow field is simulated by using the Eulerian-Lagrangian multi-phase flow particle tracing model and the SST k-w turbulence model in the CFX software. On the basis of the grid independence verification, the droplet trajectory in the valve was studied, and the easily damaged parts on the valve surface were analyzed. Based on the simulation results of two-phase flow field, an explicit dynamic software LS-DYNA is used to analyze the stress and strain of droplets impacting on the target plate, and the anti-erosion characteristics of various parts of the valve under different working conditions are compared. Finally, according to the simulation results of the two-phase flow field and the dynamic simulation results, it is concluded that reducing the normal velocity of the droplet can effectively reduce the erosion wear of the pneumatic trap valve. A new multi-level hedge structure is designed to improve the erosion resistance of the trap.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH138.52
本文编号：2208262
[Abstract]:Droplet erosion refers to a kind of loss phenomenon when the material is impacted by small and loose droplet particles. It is also one of the main forms of surface damage of pneumatic trap and other equipment. The condensate water in steam pipe will strongly impact the valve or the equipment using steam under the push of high speed steam flow, which will cause erosion damage or damage to the equipment such as valve, and reduce the service life of the equipment. Based on this, the erosion characteristics of gas-liquid two-phase flow in pneumatic trap are studied in this paper, and the method of reducing erosion damage has important engineering value and theoretical value. In this paper, the SY4500 pneumatic trap is used as the research object, and the flow field is simulated by using the Eulerian-Lagrangian multi-phase flow particle tracing model and the SST k-w turbulence model in the CFX software. On the basis of the grid independence verification, the droplet trajectory in the valve was studied, and the easily damaged parts on the valve surface were analyzed. Based on the simulation results of two-phase flow field, an explicit dynamic software LS-DYNA is used to analyze the stress and strain of droplets impacting on the target plate, and the anti-erosion characteristics of various parts of the valve under different working conditions are compared. Finally, according to the simulation results of the two-phase flow field and the dynamic simulation results, it is concluded that reducing the normal velocity of the droplet can effectively reduce the erosion wear of the pneumatic trap valve. A new multi-level hedge structure is designed to improve the erosion resistance of the trap.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH138.52
【共引文献】
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