【摘要】：工業(yè)生產(chǎn)中涉及許多大管徑管道流量測量問題,由于安裝條件的限制,管道內(nèi)的流體不能充分發(fā)展,因此管道內(nèi)的流體流速分布未知。為了準(zhǔn)確測量大管徑管道內(nèi)速度分布未知流場的流量,本文采用插入式電磁流量計,通過測取管道內(nèi)多點流速來推算管內(nèi)流量。本文對圓形管道內(nèi)二維流場流速分布和特征點數(shù)學(xué)模型、插入式流量計原理以及測量探頭的結(jié)構(gòu)進(jìn)行了理論研究,并且設(shè)計了多探頭插入式電磁流量檢測裝置和實驗方案。此外,本文還提出一種適用于流速分布未知非充分發(fā)展管流的多測點流速流量計算方法—擬合曲線法。最后,本文應(yīng)用FLUENT軟件進(jìn)行仿真實驗:1.構(gòu)建出多個非充分發(fā)展流場進(jìn)行流場分析,選出最優(yōu)特征點數(shù)學(xué)模型—“對數(shù)-切比雪夫”法;2.對插入式流量計附近流場進(jìn)行數(shù)值模擬,分析插入式流量計對流場影響并對比兩種結(jié)構(gòu)插入式測量探頭的優(yōu)劣;3.對插入多探頭插入式電磁流量裝置的管道進(jìn)行數(shù)值模擬,并得到各測點的仿真數(shù)據(jù)。利用MATLAB軟件對仿真實驗得到的多點流速分別基于擬合曲線法和算數(shù)平均法進(jìn)行融合計算,對兩種計算方法進(jìn)行對比分析。通過對仿真數(shù)據(jù)的處理和分析,最終證明了擬合曲線法比起傳統(tǒng)的算數(shù)平均法,大大提高了測量精度,尤其適用于流速分布未知的非充分發(fā)展管道的多測點流量計算。
[Abstract]:Many problems of flow measurement of large diameter pipeline are involved in industrial production. Due to the limitation of installation conditions, the fluid in the pipeline can not be fully developed, so the distribution of fluid velocity in the pipeline is unknown. In order to accurately measure the flow rate of unknown flow field in large diameter pipeline, this paper uses plug-in electromagnetic Flowmeter to calculate the flow rate in the pipe by measuring the multi-point velocity in the pipeline. In this paper, the mathematical model of velocity distribution and characteristic point of two-dimensional flow field in circular pipeline, the principle of plug-in Flowmeter and the structure of measuring probe are studied theoretically, and the multi-probe plug-in electromagnetic flow detection device and experimental scheme are designed. In addition, this paper also presents a multi-point velocity flow calculation method, the fitting curve method, which is suitable for the unknown velocity distribution and not fully developed pipe flow. Finally, the simulation experiment is carried out by using FLUENT software: 1. Several underdeveloped flow fields are constructed to analyze the flow field, and the optimal characteristic point mathematical model-logarithm-Chebyshev method is selected. 2. The numerical simulation of the flow field near the plug-in Flowmeter is carried out, and the influence of the plug-in Flowmeter on the flow field is analyzed and the advantages and disadvantages of the two kinds of plug-in probe are compared. The pipeline inserted into the multi-probe plug-in electromagnetic flow device is simulated, and the simulation data of each measuring point are obtained. The multi-point velocity obtained from the simulation experiment was calculated by MATLAB software based on the fitting curve method and the arithmetic average method respectively, and the two calculation methods were compared and analyzed. Through the processing and analysis of the simulation data, it is proved that the fitting curve method greatly improves the measurement accuracy compared with the traditional arithmetic average method, especially suitable for the multi-measuring point flow calculation of the underdeveloped pipeline with unknown velocity distribution.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB937

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