本文選題：計(jì)量閥門 + 流阻特性��； 參考：《浙江理工大學(xué)》2017年碩士論文

【摘要】：閥門和流量計(jì)作為流體控制和計(jì)量元件,在石油化工、能源輸送、水利水電等行業(yè)中起到了重要的作用。在閥門和流量計(jì)的實(shí)際應(yīng)用過(guò)程中,沒有足夠的空間來(lái)保證它們前后直管道長(zhǎng)度要求,進(jìn)而導(dǎo)致內(nèi)部流體介質(zhì)劇烈擾動(dòng),影響了流量計(jì)的計(jì)量精度,很難實(shí)現(xiàn)精確控制、精密計(jì)量的目的。本文以套筒調(diào)節(jié)閥和旋進(jìn)旋渦流量計(jì)組成的計(jì)量閥門為研究對(duì)象,采用數(shù)值模擬和實(shí)驗(yàn)研究相結(jié)合的方法研究計(jì)量閥門的流阻特性、計(jì)量特性和內(nèi)部流動(dòng)特性。為提高計(jì)量精度,對(duì)計(jì)量閥門進(jìn)行了改進(jìn)研究。主要研究?jī)?nèi)容如下:(1)采用三維軟件Solidworks對(duì)計(jì)量閥門的內(nèi)部流道進(jìn)行三維建模,并利用Gambit軟件進(jìn)行網(wǎng)格劃分。通過(guò)對(duì)比幾種不同類型的湍流模型,選擇適合本研究的RNG?-?湍流模型,利用FLUENT軟件對(duì)計(jì)量閥門的內(nèi)部流動(dòng)進(jìn)行數(shù)值模擬。并搭建計(jì)量閥門研究試驗(yàn)臺(tái),分析在不同進(jìn)口速度和閥門開度下計(jì)量閥門的流阻特性、計(jì)量特性和內(nèi)部流動(dòng)特性。(2)通過(guò)數(shù)值模擬和實(shí)驗(yàn)研究分析了套筒調(diào)節(jié)閥和旋進(jìn)旋渦流量計(jì)之間的相互影響規(guī)律。分析了不同進(jìn)口速度下,計(jì)量閥門的阻力系數(shù)和流量系數(shù)隨閥門開度的變化規(guī)律,研究了閥門和流量計(jì)的安裝位置對(duì)計(jì)量精度的影響,通過(guò)計(jì)量閥門的內(nèi)部流動(dòng)特性分析計(jì)量誤差產(chǎn)生的原因。根據(jù)套筒調(diào)節(jié)閥和旋進(jìn)旋渦流量計(jì)的特性,我們更希望閥門安裝在流量計(jì)的上游。(3)為進(jìn)一步提高計(jì)量精度對(duì)計(jì)量閥門進(jìn)行了改進(jìn)研究,通過(guò)增加計(jì)量閥門內(nèi)部直管道的方式來(lái)降低旋進(jìn)旋渦流量計(jì)上游的來(lái)流擾動(dòng),并給出了合理的改進(jìn)方案。改進(jìn)后的計(jì)量閥門在計(jì)量特性方面和內(nèi)流場(chǎng)穩(wěn)定性方面都有很大程度的提高。實(shí)驗(yàn)結(jié)果驗(yàn)證了數(shù)值模擬結(jié)果的準(zhǔn)確性,同時(shí)也揭示了計(jì)量閥門開發(fā)和研究的可行性。
[Abstract]:Valves and Flowmeters, as fluid control and metering components, play an important role in petrochemical, energy transmission, water conservancy and hydropower industries. In the practical application of valve and Flowmeter, there is not enough space to ensure the length requirement of straight pipe, which leads to the severe disturbance of internal fluid medium, which affects the measuring accuracy of Flowmeter, and it is difficult to realize accurate control. The purpose of precise measurement. In this paper, the measurement valve composed of sleeve regulating valve and rotary vortex Flowmeter is taken as the research object, and the flow resistance characteristics, measurement characteristics and internal flow characteristics of the measuring valve are studied by the method of numerical simulation and experimental study. In order to improve the measuring accuracy, the improvement research on the measuring valve was carried out. The main research contents are as follows: (1) 3D software Solidworks is used to model the internal flow channel of the metering valve, and Gambit software is used to mesh the valve. By comparing several different types of turbulence models, the suitable RNG-? In the turbulence model, the internal flow of the measuring valve is numerically simulated by fluent software. At the same time, a measuring valve research test-bed is built to analyze the flow resistance characteristics of the measuring valve under different inlet speed and valve opening. Through numerical simulation and experimental study, the interaction between the sleeve regulating valve and the rotary vortex Flowmeter is analyzed. The variation law of resistance coefficient and flow coefficient with valve opening at different inlet velocities are analyzed, and the influence of valve and Flowmeter installation position on measurement accuracy is studied. The causes of metering errors are analyzed through the internal flow characteristics of metering valves. According to the characteristics of sleeve regulating valve and rotary vortex Flowmeter, we hope that the valve should be installed upstream of the Flowmeter. In order to reduce the upstream disturbance of swirl vortex Flowmeter, a reasonable improvement scheme is given by adding the straight pipe inside the metering valve to reduce the flow disturbance in the upstream of the swirl vortex Flowmeter. The improved metering valve has a great improvement in metering characteristics and internal flow field stability. The experimental results verify the accuracy of the numerical simulation results and reveal the feasibility of the development and research of the metering valves.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH134

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本文編號(hào)：2049361