Effect of Inlet Slot Number on the Spray Cone Angle and Discharge Coefficient of Swirl Atomizer

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• 作者：Mohd Syazwan Firdaus Mat Rashid ; Ahmad Hussein Abdul Hamid ; Ow Chee Sheng ; Zulkifli Abdul Ghaffar
• 关键词：Pressure swirl atomizer ; Spray cone angle ; Discharge coefficient ; Cold flow test
• 刊名：Procedia Engineering
• 出版年：2012
• 出版时间：2012
• 年：2012
• 卷：41
• 期：Complete
• 页码：1781-1786
• 全文大小：785 K

文摘

Liquid atomization is a process of changing the liquid into small droplets. There are many applications which are related to liquid atomization including fuel injection in combustion systems and also in agricultural sprays. In pressure swirl atomizer, the liquid is injected into the atomizer through tangential port and a swirling motion is formed inside the swirl chamber. At high strength of swirling motion, an air core will be visible inside the atomizer. The liquid is then discharged from the orifice to form a spray which breaks up the liquid into small droplets. The objective of this paper is to report on the effect of inlet slot number (n) on the spray cone angle and discharge coefficient (Cd). The injection pressure was varied in the range of 2 to 8 bar and water was used as the working fluid. Experimental data shows that the spray cone angle increases as the injection pressure increased, regardless of inlet slot number. It is also observed that the atomizer with the most number of inlet slots produces widest spray. The effect of injection pressure on spray cone angle is more prominent at a lower range of injection pressure and greater number of inlet slot. The spray cone angle increases by only 5.4 % as the inlet slot number increased from 2 to 5 for an injection pressure of 2 bar, but increases by 10.7 % for an injection pressure of 8 bar. Furthermore, it is found that higher injection pressure and lesser number of inlet slot leads to lower discharge coefficient. It also noticed that, greater number of inlet slot has higher discharge coefficient.