利用双差压式节流装置测量湿气

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1、_：口㈣剃⑧天串大誊÷目*K*一M大学利用双差压式节流装置测量湿气硕士学位论文_两啊啊唰圈

2、灌-绳I嘲0___学科专业：检测技术与自动化装置作者姓名：堂塑——指导教师：棣英副教授天津大学研究生院2008年8月AbstractThegas—liquidtwophaseflowphenomenaareverycommoninmanyfieldsofindustries．Asaparticularsubsetofgas-liquidtwophaseflow,wetgasiswidelyexistsinindustriessuchaspet

3、roleum，naturalgas，chemicalengineering，energysources，metallurgy,pipelinetransportandmedicineengineeringetc．．Soitisofgreatimportancetoaccuratelymeasuretheindividualflowratesofeachconstiuentrealtime．Here，wetgasmeteringisthemaintaskinthisresearch．Afterdiscoverthewetgasmete

4、ringcharacteristicsofconeandventuriflowmetersrespectively，anovelprototypeofdoublepressuredifferentialdevicecomposedofoneconeandoneventuretubeispresentedandanewmethodtomeasuretheindividualflowratesisadvancedwithoutanyconditioning，aswellaspartial—andfullseparation．Themai

5、nlyresearchworksareasfollows．1．Studyingonthepermanentpressurelossofdifferentialpressureflowmeters，andthedifferenceofpermanentpressurelossofVconeflowmetersintermsofsinglephaseflowconditionandwetgasflowcondition．2．Onthebasisofcomparingthedifferenceofwetgasmeteringcharact

6、eristicsofconeandventuriflowmeter,anewmethodofwetgasmeteringisobtained．Derivingfromthemechanismofthedifferenceof“overreading”，Thedesignofthedoubledifferentialpressuredeviceisoptimizedsuccessfullyandtwowetgasmeteringsystemwerecompleted．3．Analyzingtheindividualinfluenceo

7、fliquidratio，Froudenumberandpressureonthewetgasmeteringcharacteristicsofthedoubledifferentialpressuredevice．Onthebasisofexperiment，theDeleeuwoverreadingmodelcanbemodified，andtheoverreadingmodelofVconeflowmeterswithtwobetaratiocanbeachieved．4．Comparingthemeteringaccurac

8、yofgasflowrateswithliquidflowratesofVconeflowmeterandventuriflowmeter,venturiflowmeterillustratesahigheraccuracyforliquidflowratesmeteringandVconeflowmeter,ahigheraccuracyforgasflowratesmetering．Anewmeteringalgorithmbyiteratingtheoverreadingmodelispresented．Theexperime

9、ntalresultsshowthatthemeanrelativeerrorofgasflowratesislessthan4-1％andfullscaleerrorofliquidrates．1essthan4-1O％overth