Theoretical Discussion And Structural Optimization Of Swirlmeter

The flow measure is the most complex parameter measure in theautomatic control parameter measure. It is fairly important in the nationaleconomy, the national defense development and scientific research. Theswirlmeter is a kind of fluid vibratory type flowmeter which is developed,then invested the market in the recent several dozens years. Apply topetroleum, steam, natural gas, water and many kinds of medium flow measure.It mainly be used in measuring the middle and low pressure and the middleand small flux of gas (such as pipeline fuel gas in the city, the gas' pressureand fluid speed can't too be high for security factor and so on), hasn't themechanical mobile components, restrains erosive ability well, and has widemeasuring range ratio and so on merit.However, swirlmeter has also much deficiency. For instance principle ofswirlmeter isn't more consummate than that of other flowmeters, and thepressure loss is correspondingly severity. At present the scholar and scientificresearcher concentrate their analysis and research to installment, use andsignal detecting. Hitherto the author hasn't seen any particular investigateabout the article of swirlmeter's internal structure and pressure loss.Therefore the thesis did the thorough research on the fundamentalresearch, the numerical simulation and the experiment confirmed method. Theinvestigative innovation and achievement are as follow:Thoroughly having studied principle of swirlmeter, and having made thedetailed mathematics inferential reasoning and the explicit literal description;Using Fluent simulation software, the author has analyzed pressure lossof swirlmeter:Δp =K₁ρQ²/D⁴ . Pressure loss has the direct ratio with thesquare of flux. Moreover flux is higher then pressure loss is more serious.When structure of the swirl generator and the shell were changed, the relationis still the conic, only the K₁ changing;Using Fluent simulation software, the author has optimized design ofswirl generator's vane, causes not only flux lower limit has reduced from10m³/h to 5m³/h, but also the pressure loss has minished from 17. 5ρQ² /D⁴to 7. 8ρQ² /D⁴ , simultaneously has obtained the experimental confirmation;The thesis has also confirmed linear relation between swirl pulsatilefrequency and flux of swirlmeter;The thesis' investigative results have provided the basis of lackingminutely investigative principle of swirlmeter at present, have built the betterfoundation for further studying pressure loss of swirlmeter, and have thegreater practical value to expand the metrical range lower limit of swirlmeter,simultaneously reduce pressure loss and so on.