https://orcid.org/0000-0003-2975-9582
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ABSTRACT
It has been suggested that using an elliptical nozzle could enhance the atomization and mixture quality. In order to explore the elliptical liquid jet on spray and flow field characteristics in supersonic airflow, the VOF-Spray one-way coupling model was adopted to study the nozzle exit patterns, size, and velocity distribution of droplets. The research also compared the flow field characteristics in Mach 2.85 air crossflow under the application of different orifices. The numerical results showed that elliptical 4 nozzle (Aspect ratio of 4) had better flow performance than circular nozzle. The cavitation area and turbulent disturbance of elliptical 4 nozzle were mainly concentrated in the major axis direction. The elliptical 4 jet always had a lower penetration depth than circular jet. At the flow range of 0 ~ 50 mm, the penetration depth of elliptical 4 jet is roughly 12% less than that of circular jet. Another finding was that the spanwise extension range of elliptical 4 spray was larger than the circular spray. The spanwise extension range of elliptical 4 spray increased by about 19.4% at most in the flow range of 0 ~ 50 mm. Additionally, the elliptical 4 spray had the smallest Santer Mean Diameter (SMD). The elliptical 4 jet had a 2.9% smaller Santer Mean Diameter than the circular jet. Due to the greater windward surface area of the elliptical 4 orifice, the gas streamwise velocity near the bottom wall was reduced. A reverse vortex pair with distinct characteristics could be observed under the application of elliptical 4 orifice. Furthermore, compared with the circular orifice, the shock wave angle generated by elliptical 4 orifice reduced by 9.7%, and the total pressure recovery coefficient rose by 2.3%.
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Bifeng Yin
Bifeng Yin is currently working as Professor in the School of automotive and traffic engineering, Jiangsu University, Zhenjiang, China. He received his PhD in Power Engineering and Engineering Thermal Physics in 2011 from Jiangsu University, China. His research interests are combustion process and emission pollutant control of internal combustion engine, Power train tribology, Power mechatronics and intelligent control technology and Development and application of new power system.
Kang Zhang
Kang Zhang is currently studying as a postgraduate in the School of automotive and traffic engineering, Jiangsu University, Zhenjiang, China. He will receive his Master degree in Power Engineering and Engineering Thermal Physics in 2024 from Jiangsu University, China. His research interests are jet breakup process and characteristics of scramjet engine.
Shenghao Yu
Shenghao Yu is a lecturer and a researcher in the School of automotive and traffic engineering, Jiangsu University, Zhenjiang, China. He received his PhD in Power Engineering and Engineering Thermal Physics in 2020 from Jiangsu University, China. His research interests are liquid fuel spray and combustion characteristics.
Hekun Jia
Hekun Jia is currently working as Professor in the School of automotive and traffic engineering, Jiangsu University, Zhenjiang, China. He received his PhD in Power Engineering and Engineering Thermal Physics in 2013 from Jiangsu University, China. His research interests are combustion process and emission pollutant control of internal combustion engine.
Chen Chen
Chen Chen is currently working as Assistant Professor in the School of automotive and traffic engineering, Jiangsu University, Zhenjiang, China. He received his PhD in Mechanical Design and Theory in 2017 from Southwest Jiaotong University, China. His research interests are spray characteristics and engineering application of an open-end swirl injector.