转动环中PIV,粒子成像测速,速度矢量场,速度场检测方案(粒子图像测速)

Equations and boundary conditionsRegime TransitionsData processingRecent resultsNumerical simulations with EULAG Experimental setupEquations and boundary conditionsRegime TransitionsData processingRecent resultsNumerical simulations with EULAGOutlookContent Experimental setup Outlook PlV-and LDV-measurements of baroclinic wave interactionsin a thermally driven rotating annulus U. Harlander， Th.v. Larcher， K. Alexandrov， and C. Egbers Department of Aerodynamics and Fluid Mechanics， BTU Cottbus October 7， 2008 三 QC 1Experimental setup 2 Equations and boundary conditions 3 Regime Transitions 4 Data processing 5 Recent results Frame co-rotating with cylinder Frame co-rotating with wave LDA observations 6 Numerical simulations with EULAG Outlook 三 QC Outlook 本Q warm Fruh and Read， 1997 DeutscheForschungsgemeinschaftDFG Outlook rout =12.5cm rin=4.5cmAT=7.5K 3 cpm 三 QC Outlook PlV observation in the inertial frame Frame A Frame BProblems How to switch to co-rotating frame? ve=v-x7 How to get rid of the shadow? 卜三> 三 QC Outlook PIV velocity，vmax=0.019831(Bild Nummer：116) Zenter：x0=119.5 y0=137 PIV velocity， vmax=0.025898(Bild Nummer：117) Zenter：x0=119.5 y0=137.2 250 200 50 0 50 100 150 200 250 Zweite Aufnahme wird in 180 Grad gedreht The heated rotating annulus Outlook Results： mean flow Harlander， Wang， Egbers (2008)， proceedings Laser conference， Lisbon BTU Experimental setup Frame co-rotating with cylinder Frame co-rotating with wave LDA observations Outlook Different names for the same thing： POD， EOF， PCA， Factor Analysis， Karhunen-Loewe-Expansion，…. Data matrix Covariance matrix R=F'F ai= Fv： Explained variance y of v is defined as y ：=i=1X 三 三> 三 QC LDA observations Outlook Results： variability DeutscheForschungsgemeinschaftDFG 三 QC LDA observations Results： variability DeutscheForschungsgemeinschaftDFG QC LDA observations Numerical simulations with EULAG Outlook Resu ts： variability BTU DeutscheForschungsgemeinschaftDFG 三 Outlook Results： mean flow Laser slicePIV： time mean flow Harlander & Wang， BTU Cottbus 2008 DeutscheForschungsgemeinschaftDFG 三卜<三> QC Outlook Results： variability DeutscheForschungsgemeinschaftDFG 三 QC LDA observations Numerical simulations with EULAG Outlook Resu ts： variability BTU DeutscheForschungsgemeinschaftDFG LDA principle BTUSource http：//laum-vld.univ-lemans.fr 三 三 三 QC LDA observations 寸O -arlander， v. Larcher， Wang， and Egbers (2008) 三 三 三 LDA observations 1000 寸OE Azimuth D=0-2元 Parameters heating/cooling ±0.2K/s time 100s no rotation Parameters heating/cooling ±0.2K/s time 100 +50s rotation 7.6cpm 25 Outlook Future activities CombiningPlV and thermography： can we estimate velocity fromtemperature? 20E 30EIE 25S Breaking azimuthal symmetry of the annulus： still regular flows? Irregular regime： is the wave breaking symmetric? 三 QC Outlook Acknowledgement Our work is part of the priority program MetStrom by the DeutscheForschungsgemeinschaft. Financial support is gratefully acknowledged. DeutscheForschungsgemeinschaftDFG 三 QC >The heated rotating annulusEULAG workshop， Bad Tolz， October ， <>卜The heated rotating annulusEULAG workshop， Bad Tolz， October ，