37 KB2518 KB37 KB199920252002Leskovar, MatjažMavko, Borut10 straniletnik:48številka:8str. 449-458ISSN:0039-2480COBISSID:5590299URN:URN:NBN:SI:doc-KTL3L11PenslAssociation of Mechanical Engineers and Technicians of Slovenia et al.Zveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikeksplozija pareeksplozijemetode z nivojsko funkcijomodeli večfaznimodeliranjeparasimulacijesimuliranjetok večfaznivečfazni tokSimuliranje izotermnega QUEOS preskusa mešalne faze eksplozije pare Q08| Simulation of the isothermal QUEOS steam-explosion premixing experiment Q08|The premixing phase of a steam explosion covers the interaction of the melt jet with the water prior to any steam explosion occuring. To ger a better insight into the hydrodynamic processes during the premixing phase in addition to "hot" premixing experiments, where the water evaporation is significant. "cold" isothermal premixing experiments were also performed. The special feature of isothermal premixing experiments is that three phases are involved - the water, the air and the spheres phase - but only the spheresphase mixes with the other two phases, whereas the water and air phases do not mix and remain separated by a free surface. Our idea was to treat the isothermal premixing process with an original, combined multiphase model. In the developed combined multiphase model the water and air phases are treatied with a free-surface model as a single joint phase with discontinious phase properties at the water-air interface. The spheres are treated, as a usual, with a multiphase flow model, where the spheres representthe dispersed phase and the joint water-air phase represents the continuous phase. Mešalna faza eksplozije pare obsega interakcijo curka taline z vodo pred izbruhom eksplozije pare. Da bi bolje spoznali hidrodinamične procese med mešalno fazo eksplozije pare, izvajajo poleg "vročih" preskusov, pri katerih je pomembno uparjanje vode, tudi "hladne" izotermne preskuse. Značilnost izotermnih preskusov mešalne faze eksplozije pare je, da se od vseh treh faz, to je vode, zraka in kroglic, z drugima dvema fazama pomešajo le kroglice, medtem ko ostaneta voda in zrak ločena z gladko medfazno ploskvijo. To dejstvo smo upoštevali pri razvoju izvirnega kombiniranega večfaznega modela mešalne faze eksplozije pare. Pri razvitem kombiniranem večfaznem modelu obravnavamo vodo in zrak z modelom proste površine kot eno, združeno fazo z nezveznimi faznimi lastnostmi na medfazni ploskvi voda - zrak, kroglice pa obravnavamo kot običajno z modelom večfaznega toka, pri katerem pomenijo kroglice razpršeno fazo, združena faza voda - zrak pa kontinuum, ki obdaja kroglice. TEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo