發(fā)布時(shí)間：2018-05-03 05:05

  本文選題：射流流量計(jì) + 斯特勞哈數(shù)��； 參考：《中國(guó)計(jì)量大學(xué)》2016年碩士論文

【摘要】：射流流量計(jì)是一種利用附壁效應(yīng)附加反饋通道產(chǎn)生流體振動(dòng)的流量計(jì),在較寬的流量范圍內(nèi),其振蕩頻率與流量呈線性關(guān)系。射流流量計(jì)具有體積小,使用壽命長(zhǎng),理論測(cè)量下限低,測(cè)量精度高等特點(diǎn),在家用燃?xì)狻⑺歪t(yī)學(xué)流體等小流量測(cè)量場(chǎng)所具有廣泛的應(yīng)用前景。目前對(duì)射流流量計(jì)的研究主要集中于平面式射流振蕩器。但是,對(duì)于平面式射流振蕩器而言,其流體振蕩平面與管道軸線在同一平面內(nèi),致使上游管道內(nèi)流量壓力脈動(dòng)容易對(duì)射流振蕩器內(nèi)部流場(chǎng)產(chǎn)生干擾,降低了射流流量計(jì)的測(cè)量精度。此外,傳統(tǒng)射流流量計(jì)還存在抄表不便,不易標(biāo)定等問(wèn)題,限制了其應(yīng)用范圍。為此解決上述問(wèn)題,本文在前人研究的基礎(chǔ)上,研制了一種新型射流流量計(jì),主要完成工作如下:(1)射流振蕩器建模與仿真研究。根據(jù)射流的附壁效應(yīng),設(shè)計(jì)了由三層射流“雙穩(wěn)”元件為核心構(gòu)成的射流振蕩器,使其流體振蕩平面與管道軸線不在同一平面內(nèi),提高射流振蕩器的抗干擾能力。在Solid Works軟件中,建立新型射流振蕩器的機(jī)械模型。將機(jī)械模型導(dǎo)入Gambit軟件,抽出流體域,劃分網(wǎng)格。將網(wǎng)格模型導(dǎo)入FLUENT軟件,模擬射流在射流振蕩器內(nèi)部的流場(chǎng)狀態(tài)。在射流振蕩器的關(guān)鍵位置布置監(jiān)測(cè)點(diǎn),在相同流量下,監(jiān)測(cè)各關(guān)鍵位置的壓力變化,確定壓力傳感器的監(jiān)測(cè)位置。同時(shí),在不同流量下,觀測(cè)射流振蕩頻率,獲得振蕩頻率與流量的對(duì)應(yīng)關(guān)系。(2)系統(tǒng)硬件與軟件設(shè)計(jì)。射流傳感器輸出信號(hào)微弱,易受到外界干擾影響,測(cè)量精度降低。為提高流量計(jì)的測(cè)量精度,設(shè)計(jì)了微弱信號(hào)處理電路。根據(jù)射流流量計(jì)的應(yīng)用需求,設(shè)計(jì)了按鍵電路、LCD液晶顯示電路、存儲(chǔ)電路、脈沖輸出電路和GSM無(wú)線通訊電路。根據(jù)模塊化的設(shè)計(jì)原則,將系統(tǒng)軟件分為頻率采集、流量計(jì)算、脈沖輸出、數(shù)據(jù)存儲(chǔ)、GSM無(wú)線通訊和按鍵子程序。(3)實(shí)驗(yàn)研究。通過(guò)相關(guān)實(shí)驗(yàn)平臺(tái)的搭建,對(duì)射流流量計(jì)樣機(jī)進(jìn)行實(shí)驗(yàn)研究,由實(shí)驗(yàn)數(shù)據(jù)得到流量計(jì)誤差和重復(fù)性,并分析其不確定度來(lái)源。實(shí)驗(yàn)結(jié)果表明,該射流流量計(jì)測(cè)量精度高,量程寬。
[Abstract]:Jet Flowmeter is a kind of Flowmeter which uses the additional feedback channel of wall attachment effect to produce fluid vibration. In a wide flow range, the oscillation frequency is linearly related to the flow rate. Jet Flowmeter has the characteristics of small volume, long service life, low theoretical measurement limit and high measurement precision. It has a wide application prospect in small flow measurement sites such as domestic gas, water and medical fluid. At present, the research of jet Flowmeter is mainly focused on plane jet oscillator. However, for a plane jet oscillator, the fluid oscillation plane is in the same plane as the pipeline axis, which makes the flow and pressure pulsation in the upstream pipeline easily interfere with the flow field inside the jet oscillator. The measurement accuracy of jet Flowmeter is reduced. In addition, the traditional jet Flowmeter has some problems, such as inconvenient meter reading and difficult calibration, which limits its application scope. In order to solve the above problems, a new jet Flowmeter is developed based on the previous studies. The main work is as follows: 1) Modeling and simulation of jet oscillator. According to the wall-attached effect of the jet, a jet oscillator composed of a three-layer jet "bistable" element is designed. The fluid oscillation plane is not in the same plane as the pipeline axis, and the anti-jamming ability of the jet oscillator is improved. The mechanical model of a new jet oscillator is established in Solid Works software. The mechanical model is imported into Gambit software, and the fluid domain is extracted and meshed. The grid model is imported into FLUENT software to simulate the flow field of jet in the jet oscillator. The monitoring points are arranged at the key position of the jet oscillator, and the pressure change at each key position is monitored under the same flow rate, and the monitoring position of the pressure sensor is determined. At the same time, the corresponding relationship between the oscillation frequency and the flow rate is obtained by observing the frequency of the jet oscillation under different flow rates. The hardware and software design of the system is obtained. The output signal of jet sensor is weak, easy to be affected by external interference, and the measurement accuracy is reduced. In order to improve the measuring accuracy of Flowmeter, a weak signal processing circuit is designed. According to the application requirements of jet Flowmeter, the key circuit, LCD LCD display circuit, storage circuit, pulse output circuit and GSM wireless communication circuit are designed. According to the modular design principle, the system software is divided into frequency acquisition, flow calculation, pulse output, data storage GSM wireless communication and keystroke subprogram. Through the construction of the related experimental platform, the experimental research on the prototype of the jet Flowmeter is carried out, the error and repeatability of the Flowmeter are obtained from the experimental data, and the source of uncertainty is analyzed. The experimental results show that the jet Flowmeter has high measuring accuracy and wide measuring range.
【學(xué)位授予單位】：中國(guó)計(jì)量大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TH814

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本文編號(hào)：1837081