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유체 물성치 변화가 슬링거 노즐 출구 분열거동에 미치는 영향
서예찬(Yechan Seo),유경원(Gyungwon You),이지근(Jeekeun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In modern small gas turbine engines, the slinger nozzles that work with the driving force of the turbine axis are widely applied for supplying fuel to combustor. However, there are not enough research to understand the atomization characteristics of slinger nozzles. As a result, it is difficult to predict spray characteristics in real gas turbine combustors. In this study, the effect of physical properties of fuels on spray characteristics of slinger nozzles were experimentally carried out, and the spray behaviors were imaged with the shadowgraphy technique coupled with a high-speed camera. Through the experiment, the spray characteristics at the nozzle exit are changed with the density, surface tension and viscosity of liquid fuel supplied in the slinger nozzle. In particular, it was confirmed that the density and viscosity of liquid fuel affect the film thickness at the inside of a slinger nozzle orifice.
서예찬(Yechan Seo),알리 차라난데(Ali Charanadeh),이지근(Jeekeun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Rotary atomizers are utilized in many industrial areas owing to the advantages that it can form small and even droplets or particles with narrow band of droplet spectrum. However, there are not sufficient research to understand the atomization mechanism of rotary atomizers. In particular, spray imbalance of horizontal rotary atomizers with azimuthal direction was confirmed through the recent research. In this study, the experimental research was carried out to investigate the uneven distribution of the liquid inside the rotary atomizers. When liquid supplied to the inside of rotary atomizer, the liquid was unevenly distributed due to the wall shear stress and the gravitational effect.
Internal Flow Analysis of a Slinger Atomizer
Ali Charanandeh,Yechan Seo,Jeekeun Lee 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In the present experimental and computational study, the internal flow of a Slinger atomizer is investigated. A nozzle with an outer glass disk was designed to visually scrutinize the nozzle internal flow, and numerical simulations were conducted using the Volume of Fluid (VOF) model to discern the interface between two phases. Both CFD simulations and experimental visualizations revealed that, contrary to current assumptions, the liquid flow distribution inside the slinger nozzle is not uniform. It was observed that gravity has a significant impact on the internal flow of the nozzle and is one of the primary causes of the slinger atomizers non-uniform flow distribution. Also, liquid non-uniformity was observed inside the nozzle orifices.