基于分支管的质量流量计的管道结构与流场仿真
发布时间：2018-11-11 14:18
【摘要】：随着现代工业生产的自动化程度越来越高，人们对流量的测量的要求越来越高。由于流量测量需要考虑的因素非常复杂，比如流体的类型、测量的环境条件、压力损失、流量范围、抗干扰性等因素。因此针对不同的测量因素要研究相应的测量方法。针对狭小空间、高温等恶劣环境中液体质量流量的测量具有非常高的科研价值。 本课题提出了一种改进型热分布式质量流量计的管道结构，使改进后的管道能够应用于狭小空间。根据恒功率原理，利用Fluent对新型热分布式质量流量计的管道流场进行仿真，，仿真得出不同流量下管道冷热端的温度，研究管道冷热端温差与管道中水的质量流量之间的关系。得出在一定流量范围内，冷热端温差与质量流量呈现二次变化关系。 为了扩大流量量程，根据分支管测流法在热分布式质量流量计的基础上设计了六种不同结构的管道。通过Fluent分别对各种管道流场进行仿真，仿真得出每种管道中主管道与分支管中水的质量流量，通过分析它们之间的流量关系，得出每种管道中主管道与分支管中流量之间存在的关系。 仿真结果表明，六种不同结构的管道中，a_1型和a_2型管道具有较宽的流量测量范围，更适用于热分布式质量流量计，这两种管道结构可以为热分布式质量流量计以及分支管测流法提供新的理论依据。
[Abstract]:With the increasing degree of automation in modern industrial production, the demand for flow measurement is becoming higher and higher. Because of the complexity of flow measurement, such as the type of fluid, the environmental conditions, pressure loss, flow range, anti-jamming and other factors. Therefore, the corresponding measurement methods should be studied for different measurement factors. The measurement of liquid mass flow in narrow space and high temperature is of great scientific value. In this paper, an improved pipe structure of thermal distributed mass Flowmeter is proposed, which can be used in narrow space. According to the principle of constant power, the pipe flow field of a new type of thermal distributed mass Flowmeter is simulated by Fluent, and the temperature of the cold and hot end of the pipeline is obtained under different flow rates, and the relationship between the temperature difference of the hot and cold end of the pipeline and the mass flow rate of water in the pipeline is studied. It is concluded that the temperature difference between the cold and hot ends and the mass flow rate show a secondary change in a certain flow range. In order to expand the flow measurement range, six kinds of pipes with different structures were designed based on the thermal distributed mass Flowmeter based on the branch tube flow measurement method. The flow field of each kind of pipeline is simulated by Fluent, and the mass flow of water in each main pipe and branch pipe is obtained by simulation, and the flow relationship between them is analyzed. The relationship between the flow rate in the main pipe and the branch pipe in each kind of pipeline is obtained. The simulation results show that, among the six kinds of pipes with different structures, the A _ S _ 1 and a _ S _ 2 pipes have a wide range of flow measurement, and are more suitable for thermal distributed mass Flowmeter. These two pipe structures can provide a new theoretical basis for thermal distributed mass Flowmeter and branch tube flow measurement method.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH814
本文编号：2325085
[Abstract]:With the increasing degree of automation in modern industrial production, the demand for flow measurement is becoming higher and higher. Because of the complexity of flow measurement, such as the type of fluid, the environmental conditions, pressure loss, flow range, anti-jamming and other factors. Therefore, the corresponding measurement methods should be studied for different measurement factors. The measurement of liquid mass flow in narrow space and high temperature is of great scientific value. In this paper, an improved pipe structure of thermal distributed mass Flowmeter is proposed, which can be used in narrow space. According to the principle of constant power, the pipe flow field of a new type of thermal distributed mass Flowmeter is simulated by Fluent, and the temperature of the cold and hot end of the pipeline is obtained under different flow rates, and the relationship between the temperature difference of the hot and cold end of the pipeline and the mass flow rate of water in the pipeline is studied. It is concluded that the temperature difference between the cold and hot ends and the mass flow rate show a secondary change in a certain flow range. In order to expand the flow measurement range, six kinds of pipes with different structures were designed based on the thermal distributed mass Flowmeter based on the branch tube flow measurement method. The flow field of each kind of pipeline is simulated by Fluent, and the mass flow of water in each main pipe and branch pipe is obtained by simulation, and the flow relationship between them is analyzed. The relationship between the flow rate in the main pipe and the branch pipe in each kind of pipeline is obtained. The simulation results show that, among the six kinds of pipes with different structures, the A _ S _ 1 and a _ S _ 2 pipes have a wide range of flow measurement, and are more suitable for thermal distributed mass Flowmeter. These two pipe structures can provide a new theoretical basis for thermal distributed mass Flowmeter and branch tube flow measurement method.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH814
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