【摘要】：隨著現(xiàn)代工業(yè)生產(chǎn)的自動(dòng)化程度越來越高，人們對流量的測量的要求越來越高。由于流量測量需要考慮的因素非常復(fù)雜，比如流體的類型、測量的環(huán)境條件、壓力損失、流量范圍、抗干擾性等因素。因此針對不同的測量因素要研究相應(yīng)的測量方法。針對狹小空間、高溫等惡劣環(huán)境中液體質(zhì)量流量的測量具有非常高的科研價(jià)值。 本課題提出了一種改進(jìn)型熱分布式質(zhì)量流量計(jì)的管道結(jié)構(gòu)，使改進(jìn)后的管道能夠應(yīng)用于狹小空間。根據(jù)恒功率原理，利用Fluent對新型熱分布式質(zhì)量流量計(jì)的管道流場進(jìn)行仿真，，仿真得出不同流量下管道冷熱端的溫度，研究管道冷熱端溫差與管道中水的質(zhì)量流量之間的關(guān)系。得出在一定流量范圍內(nèi)，冷熱端溫差與質(zhì)量流量呈現(xiàn)二次變化關(guān)系。 為了擴(kuò)大流量量程，根據(jù)分支管測流法在熱分布式質(zhì)量流量計(jì)的基礎(chǔ)上設(shè)計(jì)了六種不同結(jié)構(gòu)的管道。通過Fluent分別對各種管道流場進(jìn)行仿真，仿真得出每種管道中主管道與分支管中水的質(zhì)量流量，通過分析它們之間的流量關(guān)系，得出每種管道中主管道與分支管中流量之間存在的關(guān)系。 仿真結(jié)果表明，六種不同結(jié)構(gòu)的管道中，a_1型和a_2型管道具有較寬的流量測量范圍，更適用于熱分布式質(zhì)量流量計(jì)，這兩種管道結(jié)構(gòu)可以為熱分布式質(zhì)量流量計(jì)以及分支管測流法提供新的理論依據(jù)。
[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.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH814

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