插入式热式气体质量流量计的研究

2007.9SensorWorld摘要：提出了一种新型的插入式热式质量流量计的设计和标定方案。详细阐述了插入式热式气体质量流量计的设计原理，通过对准则关系式的处理得到了适用范围广、形式简单的流量表达式。分析了在制作过程中影响其精度和标定的因素，并在系统热平衡分析的基础上，提出了在传热过程中减少热损失的措施。用直接测量法对流量计进行了标定，实验结果表明，采用导热系数与密度之比较大的石墨作为传感器探头的填充物质能有效地提高流量计的响应速度，该流量计能够精确测量气体质量流量。关键词：插入式；热式质量流量计；传热；标定中图分类号：TH814文献标识码：A文章编号：1006-883X(2007)09-0021-04[1][2][3]1S1S2S1S2T∞(S1Tw()1.2.ab2007.9∞2[4]3S.W.Churchill(M.Bernstein)[5]()[]5/48/54/13/23/12/12820001/4.0162.03.0⎥⎥⎦⎤⎢⎢⎣⎡⎟⎟⎠⎞⎜⎜⎝⎛+++=erreuRPPRN1Tw+T∞/2RePr0.214/13/24.01⎥⎥⎦⎤⎢⎢⎣⎡⎟⎟⎠⎞⎜⎜⎝⎛+rPPr=0.70.5%1()[]5/48/54/13/22/13/128200017.0/4.0162.03.0⎥⎥⎦⎤⎢⎢⎣⎡⎟⎟⎠⎞⎜⎜⎝⎛++=−eeruRRPN22cerubRaPN+=−3/13.0λPrTcrrbabPTPLbUIdRM−−=31312103∆λπµπ3MUIRLdTabc0.1mmKNiCr-NiSi[6]4a4(b)[7]P=Q1+Q2+Q3(4)3.4(a)4b2007.9SensorWorldλ−=2(5)dxdtAλ3Q3Tw100°CQ3=εσA)(44∞−TTW(6)εσATwT∞Q2Q3FCIST980[8]ADAM51[2]671%5.6.7.2007.9[1][J]199682654-56[2][M]2002[3][J]2005,(10)29-32[4][M]2001[5]ChurchillSW,BernsteinM.Acorrelatingequationforforcedconvectionfromgasesandliquidstoacircularcylinderincrossflow.ASMEJHeatTransfer,1977,99(1):300-306[6]Baker.R.C.,Gimson.C.Theeffectsofmanufacturingmethodsontheprecisionofinsertionandin-linethermalmassflowmetersFlowMeasurementandInsstrumentation2001(4)113121[7][D].2005[8][J]2002204149152StudyOnInsertionThermalGasMassFlow-MeterAbstract:Thedesignandcalibrationprojectsofanewinsertionthermalgasmassflow-meterareofferedinthispaper.Theprincipleandmethodsofinsertionthermalgasmassflow-meterareexpounded,andasimplefluxexpressionwithextensiveapplicationsphereisobtainedwhiledealingwiththecriterionrelation.Theconsiderationfactorsofprecisionandcalibrationinmanufacturearediscussed.Inaddition,themeasurementsareproposedtoreducetheheatloss,basedonthethermalbalanceanalyses.Theflow-meteriscalibratedwithdirectmeasurementmethod.Experimentalresultsshowthattheflow-meterresponseisgreatlyimprovedusinggraphiteasfillerwhichhashighthermalconductioncoefficientdensityratio.Theflow-meterhasperfectperformanceandcanaccuratelymeasuregasmassflux.Keywords:insertion;thermalmassflow-meter;heattransfer;calibration402216(100083)13811151433010-82339665Email:[e-mail]本文编辑：霍莉读者服务卡编号004□8ST980