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2015, vol. 65, br. 2, str. 11-19
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Eksperimentalno i numeričko istraživanje nadkritičnog strujanja oko hrapave kugle
Experimental and numerical study of super-critical flow around the rough sphere
aInstitut Goša, Beograd, Srbija bUniverzitet u Beogradu, Mašinski fakultet, Srbija cVojnotehnički institut - VTI, Beograd, Srbija
e-adresa: sumonja@yahoo.com
Projekat: Naučno-tehnološka podrška unapređenju bezbednosti specijalnih drumskih i šinskih vozila (MPNTR - 35045)
Primena savremenih mernih i proračunskih tehnika za izučavanje strujnih parametara ventilacionih sistema na modelu energetski izuzetno efikasnog (pasivnog) objekta (MPNTR - 35046)
Istraživanje i optimizacija tehnoloških i funkcionalnih performansi ventilacionog mlina termoelektrane Kostolac B (MPNTR - 34028)
Sažetak
Rad predstavlja eksperimentalno i numeričko istraživanje modela sfere sa ciljem predviđanja ponašanja strujanja u prisustvu hrapavosti površina. Rezultati ukazuju na probleme i predlažu rešenje za inžinjersku primenu. Sličnost između strujnih slika dobijenih numeričkim putem i u aerotunelu je postignuta kombinovanim uvođenjem turbulencije u numeričkoj slobodnoj struji hrapavosti površine, zbog ograničavajućih zahteva turbulentnih modela.
Abstract
This paper presents the experimental and numerical research on the sphere model with the goal of prediction of a flow behaviour in a presence of the surface roughness. Results indicate the problems and suggest the solution for engineering practice. The similarity of the numerical and wind tunnel flows was reached by an application of a combination of the intentionally introduced turbulence intensity in a numerical flow as well the artificial roughness of the model, for a reason of restricted requirements of the turbulence modelling.
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