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오리피스형 분사노즐에서 작동유체의 온도변화에 따른 K-factor에 관한 연구
배강영(K. Y. Bae),김찬희(C. H. Kim),정희택(H. T. Chung),김형범(H. B. Kim) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In the present study, the numerical simulation has been performed to investigate K-factor for temperature variation of working fluid in spray nozzle with orifice. The commercial 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 showed 20% passing swirler, 70% in the region between 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 the inlet of swirIer passing it. The 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.