本文選題：雙向內(nèi)外管差壓式流量計 + 等效直徑比��； 參考：《中北大學》2016年碩士論文

【摘要】：流量計量是流量控制的基礎(chǔ),差壓式流量計是工業(yè)生產(chǎn)中應(yīng)用廣泛的一種流量計,V錐流量計出現(xiàn)為差壓式流量計的發(fā)展打開了一個新的領(lǐng)域。但是V錐流量計由于其本身結(jié)構(gòu)的原因還存在著一些不足,針對其結(jié)構(gòu)上的缺陷,有人提出了雙錐流量計和內(nèi)外管差壓流量計。本文結(jié)合了這兩種流量計的優(yōu)點,提出了一種新的差壓式流量計——雙向內(nèi)外管差壓流量計。本文從理論分析出發(fā),借用流體仿真軟件FLUENT對雙向內(nèi)外管差壓流量計在DN32管徑下的工作流場進行了模擬,研究了雙向內(nèi)外管差壓流量計的一些特性;結(jié)合實驗,對比分析了雙向內(nèi)外管差壓流量計、雙錐流量計和內(nèi)外管差壓流量計的各項性能。本文的主要完成的工作如下:1)分析雙向內(nèi)外管差壓流量計的測量原理,建立理論模型;參照其他差壓流量計,定義雙向內(nèi)外管差壓流量計的等效直徑比;分析流量計的工作流場特點,定義了分流比,確定了影響雙向內(nèi)外管差壓流量計性能的三個主要因素為:擴散角θ、節(jié)流比β和分流比α。2)利用FLUENT對擴散角進行了優(yōu)化,并以優(yōu)化的擴散角建立不同等效直徑比和分流比的模型進行仿真計算,得出等效直徑比和分流比對雙向內(nèi)外管差壓流量計性能的影響規(guī)律:流量計的壓力損失和差壓信號隨著等效直徑比的增大而減小、隨著雷諾數(shù)的增大而增大,壓損比隨著雷諾數(shù)的增大而增大;而在等效直徑比確定時,壓損比隨著分流比的增大先增大后減小,而且等效直徑比越大,壓損比最大的模型的分流比越小;分流比小的模型在低雷諾數(shù)下流出系數(shù)更穩(wěn)定,分流比大的模型在高雷諾數(shù)下流出系數(shù)更穩(wěn)定。3)在相同的等效直徑比下,對比三種流量計的性能發(fā)現(xiàn):雙向內(nèi)外管差壓流量計的節(jié)能性、準確性最好,靈敏度稍遜于內(nèi)外管差壓流量計;經(jīng)實驗驗證,結(jié)果基本一致,流出系數(shù)的誤差在2%左右。
[Abstract]:Flow meter is the basis of flow control. Differential pressure Flowmeter is a kind of Flowmeter widely used in industrial production. The appearance of V-cone Flowmeter opens a new field for the development of differential pressure Flowmeter. However, there are still some shortcomings in V-cone Flowmeter because of its own structure. In view of its structural defects, two cone Flowmeter and inner and outer tube differential pressure Flowmeter are proposed. Combining the advantages of these two kinds of Flowmeters, a new differential pressure Flowmeter, a bidirectional differential pressure Flowmeter with internal and external tubes, is proposed. Based on the theoretical analysis and the fluid simulation software FLUENT, this paper simulates the workflow field of the two-way inner and outer tube differential pressure Flowmeter under the diameter of the DN32 tube, studies some characteristics of the two-way inner and outer tube differential pressure Flowmeter, and combines the experiment with the experiment. The performances of bidirectional differential pressure Flowmeter, double cone Flowmeter and Internal and external Tube differential pressure Flowmeter are compared and analyzed. The main work of this paper is as follows: (1) analyzing the measuring principle of bidirectional internal and external tube differential pressure Flowmeter, establishing the theoretical model, defining the equivalent diameter ratio of two-way inner and outer tube differential pressure Flowmeter with reference to other differential pressure Flowmeters. The characteristics of workflow field of Flowmeter are analyzed, the diffuser ratio is defined, and the three main factors that affect the performance of bidirectional internal and external tube differential pressure Flowmeter are determined: diffusion angle 胃, throttle ratio 尾 and shunt ratio 偽. 2) the diffusion angle is optimized by FLUENT. The models of different equivalent diameters ratio and shunt ratio are established by using the optimized diffusion angle. The influence law of the equivalent diameter ratio and the shunt ratio on the performance of the differential pressure Flowmeter is obtained: the pressure loss and the differential pressure signal of the Flowmeter decrease with the increase of the equivalent diameter ratio, and increase with the increase of Reynolds number. The pressure loss ratio increases with the increase of Reynolds number, and when the equivalent diameter ratio is determined, the pressure loss ratio increases first and then decreases with the increase of the shunt ratio, and the larger the equivalent diameter ratio, the smaller the shunt ratio of the model with the maximum pressure loss ratio. The outflow coefficient of the model with small shunt ratio is more stable at low Reynolds number, and the outflow coefficient with large shunt ratio is more stable at high Reynolds number. 3) at the same equivalent diameter ratio, Compared with the three kinds of Flowmeter, it is found that the bidirectional tube differential pressure Flowmeter is energy saving, the accuracy is the best, the sensitivity is slightly lower than that of the inner and outer tube differential pressure Flowmeter, and the result is basically the same after the experiment, the error of the outflow coefficient is about 2%.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TH814

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本文編號：1914696