Effect of a Taper Intake Port on the Combustion Characteristics of a Small-Scale Rotary Engine

Run Zou (), Yi Zhang, Jinxiang Liu, Wei Yang, Yangang Zhang, Feng Li and Cheng Shi ()
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Run Zou: School of Energy and Power Engineering, North University of China, Taiyuan 030051, China
Yi Zhang: School of Energy and Power Engineering, North University of China, Taiyuan 030051, China
Jinxiang Liu: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Wei Yang: School of Energy and Power Engineering, North University of China, Taiyuan 030051, China
Yangang Zhang: School of Energy and Power Engineering, North University of China, Taiyuan 030051, China
Feng Li: School of Energy and Power Engineering, North University of China, Taiyuan 030051, China
Cheng Shi: School of Vehicle and Energy, Yanshan University, Qinhuangdao 066004, China

Sustainability, 2022, vol. 14, issue 23, 1-14

Abstract: Taper intake ports are effective in improving the charging efficiency of small-scale rotary engines (REs), but it is unclear how their structural parameters affect the in-cylinder flow field and combustion characteristics. For this reason, the effects of the diameter-length ratio ( D / L ) of an intake port on the in-cylinder flow field and combustion characteristics of a small-scale RE were numerically investigated by utilizing a three-dimensional computational fluid dynamics (CFD) model. The results showed that the in-cylinder pressure of the RE did not follow a simple single-directional trend with the D / L of the intake port, but it was divided into three levels, where the peak in-cylinder pressure was at its maximum at the D / L of 0.6 and at its minimum at the D / L of 0.8. The gas flows in the intake port with different values of the D / L were all unidirectional, and they made a difference in the vortexes formed on the leading side of the combustion chamber of the RE, which was the main factor affecting the in-cylinder combustion performance. The vortexes formed on the leading side of the combustion chamber with D / L = 0.6 were maintained for a long period of time, thus promoting the propagation of flame and advancing the center of gravity of combustion. So, the heat release rate and combustion efficiency in the cylinder were increased at the price of a larger increment in nitrogen oxide formation.

Keywords: small-scale rotary engine; taper intake port; in-cylinder flow field; combustion characteristics (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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