Fenomeni nelokalnog turbulentnog prenosa i negradijentne toplotne difuzije u KGH sistemima

Abstract

Istraživanje strukture turbulencije je neophodno za razumevanje fizike strujno-termodinamičkih procesa u KGH sistemima. Analiza i proračun ovih sistema zasnovani su na poznavanju turbulentnog prenosa i njegovom modeliranju. S tim u vezi, u radu se analiziraju fenomeni nelokalnog prenosa impulsa i nelokalnog prenosa energije toplotom u zakrivljenim kanalima, asimetričnim mlazevima, vrtložnim tragovima i vihornom strujanju. Razmatra se fizika negradijentne turbulentne difuzije i negativne produkcije u brzinskim i temperaturskim poljima. Utvrđena je izvesna analogija između turbulentnih procesa u ovim klasama strujanja. Pomoću numeričke obrade sopstvenih eksperimentalnih rezultata izvršeno je modeliranje nelokalnog turbulentnog prenosa u vihornom strujanju.

The turbulence structure investigation is essential for understanding the physics of flow-thermodynamic processes in Heating, Ventilation and Air conditioning (HVAC) systems. Analysis and calculation of these systems are based on the knowledge of turbulent transfer mechanism and its modeling. In this regard, the paper analyzes the phenomena of non-local momentum transfer and non-local transfer of energy by heat in curved channels, asymmetric jets, wakes and swirling flow. The physics of nongradient turbulent diffusion and negative production in velocity and temperature fields are analyzed. There was a certain analogy between the turbulent processes in these classes of flow. By means of numerical processing of experimental results, modeling of non-local transport in turbulent swirling flow was conducted.