As a common nature gas measuring tool, ultrasonic flow meter is more and more put into use. Therefore, the accuracy of measurement is what we concern the most. The performance of ultrasonic flow meter is closely related to fluid state which flows through it. This article identified the evaluation method of rectification effect of gasotron and its implementation steps. It proposed an assessing index L min based on dichotomy. Computational fluid dynamics method is used to simulate the model of an upstream straight pipe section with a header and plate gasotron, which obtained the assessing index L min in five different transmission conditions. Finally, the feasibility of the gasotron is validated against comparing indication errors in different installation conditions: with a header, benchmark, with a header and gasotron.
Original scientific paper Ultrasonic flow meter has been used in natural gas metering for many years, however, the measurement accuracy of the ultrasonic flow meter is affected by the header, which leads to non-perfect fluid state in the flow meter. The objective of this research is to discuss the issues of dual-path ultrasonic flowmeter with a header. Computer fluid dynamic (CFD) method is used to simulate standard turbulent model. It is found that the flow state in the downstream is distorted by the header with secondary turbulence, swirl etc., and the velocity distribution of the gas is asymmetric; the farther the distance between the ultrasonic flow meter and the header, the smaller the distortion and the simulation error. When the downstream straight pipe length is greater than 27 − D (Diameter), the flow state will be steady. With the same diameter of the header, the shorter the meter header the greater the distortion of the gas in the downstream pipe. With the same length of the header, the smaller the diameter, the greater the distortion of the gas in the downstream. These results have a great guiding significance in the optimal design of the flow meter installation structure. Keywords: Pipe manifold; Ultrasonic flow meter; Measurement performance; Indication error CFD simulacija za ultrazvučni mjerač protoka sa zaglavljemIzvorni znanstveni članak Ultrazvučni mjerač protoka koristi se u mjerenju prirodnog plina dugi niz godina, međutim, na mjernu točnost ultrazvučnog mjerača protoka utječe zaglavlje, što dovodi do nespretnog fluidnog stanja u mjeraču protoka. Cilj ovog istraživanja je raspraviti pitanja dvostruke staze ultrazvučnih mjerača protoka sa zaglavljem. Dinamička metoda računalne tekućine (CFD) je korištena za simulaciju standardnog turbulentnog modela. Nađeno je da je stanje protoka u nizvodnom smjeru izobličeno zaglavljem sa sekundarnom turbulencijom, vrtloženjem itd., a brzina distribucije plina je asimetrična; što je dalje udaljenost između ultrazvučnog mjerača protoka i zaglavlja, to je manja iskrivljenost i simulacijska pogreška. Kada je nizvodno ravna duljina cijevi veća od 27 − D (promjer), stanje protoka će biti stabilno. S istim promjerom zaglavlja, što je kraći mjerač glave, to je veća deformacija plina u nizvodnoj cijevi. S istom duljinom zaglavlja, manji je promjer, ali je veća deformacija plina u nizvodnom smjeru. Ti rezultati imaju veliko značenje u optimalnom dizajnu instalacije mjerača protoka.
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