오리피스형 분사노즐에서 작동유체의 온도변화에 따른 K-factor에 관한 연구

Abstract

In the present study, the numerical simulation has been performed to investigate K-factor fortemperature variation of working fluid in spray nozzle with orifice. The comercial CFD software, Fluent with the proper modeling was applied for analyzing the internal of the spray nozzle. Numerical result for K-factor at 20℃ agrees with the experimental result that it applied n=0.5 within about 7% error. The pressure drop inside nozzle is 20% passing swirler, 70% in the region betwen the outlet of swirler and the orifice and 10% at the outlet of orifice. As the operating pressure is increased, K-factor is decreased by effect of flow resistance at it's inlet before pass swirler. temperature increase of working fluid reduced the flow rate according to reducing of density, and average 1.23% decrease is showed in the present research.