【摘要】：在流體輸配管網(wǎng)系統(tǒng)中大量使用熱量表進(jìn)行能源計量,是實現(xiàn)“節(jié)能減排”這一基本國策的重要基礎(chǔ),而熱量表計量數(shù)據(jù)的有效性直接決定了能耗數(shù)據(jù)的統(tǒng)計結(jié)果是否可靠。流量傳感器的測量誤差對于熱量表的總體測量誤差影響較大,因此本文選取實際工程中常用的大口徑熱量表中的電磁流量傳感器為研究對象,采用實流實驗與數(shù)值模擬相結(jié)合的方法研究了不同彎頭組合形式安裝條件對電磁流量傳感器測量特性的影響。通過對電磁流量傳感器的工作原理、主要優(yōu)缺點和測量誤差產(chǎn)生的原因等進(jìn)行分析可知,由不同安裝條件造成的傳感器測量段內(nèi)部流場的非軸對稱分布對測量誤差的影響尤為明顯。為此進(jìn)行了大口徑電磁流量傳感器熱態(tài)運(yùn)行條件下的基線實驗和相關(guān)彎頭組合實驗,即以某臺DN150口徑的電磁流量傳感器在基線管段的實驗數(shù)據(jù)得到其在實際運(yùn)行狀態(tài)下的測量誤差,以此作為基準(zhǔn)與不同彎頭安裝條件下的實驗數(shù)據(jù)進(jìn)行對比,得到安裝條件所附加的誤差分量,從而分析此表具在實際安裝條件下的測量特性。在對單彎頭內(nèi)部流場理論速度分布進(jìn)行分析的基礎(chǔ)上,利用fluent軟件研究單彎頭內(nèi)部迪恩渦流的速度重組情況,給出彎頭不同截面處的流線、速度云圖、壓力云圖、峰值速度、縱向和橫向速度分布的變化情況,并形象地模擬出由于離心力和粘性力綜合作用管道內(nèi)二次流的產(chǎn)生、發(fā)展和衰減過程。對平面S型雙彎頭、異面雙彎頭、平面彎頭組合、彎頭蝶閥全開組合等上游安裝條件進(jìn)行了模擬,給出了不同截面處的速度分布、壓力分布以及流場結(jié)構(gòu),形象地表現(xiàn)出這幾種局部阻力部件對下游測量段流場產(chǎn)生擾動的過程。在本模擬管路情況下,平面S形雙彎頭和異面雙彎頭對下游流場擾動最強(qiáng),其他彎頭等組合次之,其對電磁流量傳感器測量特性的影響與對應(yīng)的實驗結(jié)果測量偏差相近。
[Abstract]:It is an important foundation to realize the basic national policy of "energy saving and emission reduction" by using a large number of heat meters for energy metering in fluid transmission and distribution network system. The validity of heat meter metering data directly determines whether the statistical results of energy consumption data are reliable or not. The measurement error of the flow sensor has a great influence on the overall measurement error of the heat meter. Therefore, the electromagnetic flow sensor in the large caliber heat meter, which is commonly used in the practical engineering, is chosen as the research object in this paper. The effect of installation conditions of different elbow combinations on the measurement characteristics of electromagnetic flux sensor was studied by combining real flow experiment with numerical simulation. Through the analysis of the working principle, the main advantages and disadvantages of the electromagnetic flux sensor and the causes of the measurement error, we can know that, The non-axisymmetric distribution of the flow field in the sensor section caused by different installation conditions has an obvious effect on the measurement error. For this reason, the baseline experiment and the related elbow combination experiment are carried out under the condition of hot operation of the large aperture electromagnetic flow sensor. Based on the experimental data of a DN150 electromagnetic flux sensor in the baseline pipe section, the measurement errors in the actual operating state are obtained, which are compared with the experimental data under different elbow installation conditions. The error components attached to the installation condition are obtained, and the measurement characteristics of the instrument under the actual installation conditions are analyzed. Based on the analysis of theoretical velocity distribution of flow field in single bend, the velocity recombination of Dean eddy current in single bend is studied by using fluent software, and the streamline, velocity cloud diagram, pressure cloud diagram and peak velocity of different sections of bend are given. The variation of longitudinal and transverse velocity distribution and the process of secondary flow generation, development and attenuation in the pipeline due to the combined action of centrifugal force and viscous force are vividly simulated. The upstream installation conditions such as plane S-type double elbow, cross-plane double bend, plane bend combination, and full opening combination of bend butterfly valve are simulated, and the velocity distribution, pressure distribution and flow field structure at different cross-sections are given. The process of disturbance of these local resistance components to the flow field in the downstream measurement section is vividly demonstrated. In the case of the simulated pipeline, the plane S-shaped double elbows and the cross-plane double elbows have the strongest disturbance to the downstream flow field, and the other elbows are the second. The effect on the measurement characteristics of the electromagnetic flux sensor is similar to the corresponding experimental results.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP212

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本文編號：2138729