Effect of Swirling Strength on Atomization in a Pressure Swirler Atomizer

• Main Authors: Chuang, Fu-Chang, 莊富強
• Other Authors: Muh-Rong Wang
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/43736584641149401500

碩士 === 國立成功大學 === 航空太空工程學系 === 86 === This research is to study the effects of the swirling strength andthe expansion angle on atomization performance. All experiments are measured under room temperture and atmosphere pressure. The atomizers are designated as No.1 to No.5 in terms of five different swirlers andfour different outlet expansion angles. The particle sizes and volume distributions are measured by Malvern Laser Diffraction Particle Sizerand patternator, respectively. The control mechanism of the atomizer design can be further dividedinto two parts, the upstream and downstream control conditions. The up-stream control conditions include the design of the flow path and the swirler chamber. It is believed the flow in the path becomes turbulentwhen Re>5500 with higher pressure drop in the atomizer. The downstreamcontrol mechanism is provided by the design of the expansion angle. Forexample, the nominal spray cone angle is 60 in this case. It can be controled in a range of 60° ± 30﹪ in terms of the different expansion angle designs. The experimental data show that the separation at the outlet will occur at Re=6000. The designer should consider the matchingcondition of the downstream expansion angle with enough swirling strengthin the upstream to achieve the desirous atomization performance.