Abstract
The Wankel engine is a rotary type of four-stroke cycle internal combustion engine. The higher specific power output is one of its strong advantages. In Wankel rotary engine, every eccentric shaft revolution corresponds to one four-stroke cycle, whereas conventional reciprocating engine fulfills four-stroke cycle in two crankshaft revolutions. This means the power stroke frequency is twice that of conventional engines. Theoretically, application of two-stroke cycle on Wankel geometry will duplicate the power stroke frequency. In this research, a single-zone thermodynamic model is developed for studying the performance characteristic of a two-stroke Wankel engine. Two different port timings were adapted from the literature. The results revealed that late opening and early closing port geometry (small opening area) with high supercharging pressure has higher performance at low speed range. However, as the rotor speed increases, the open period of the port area becomes insufficient for the gas exchange, which reduces power performance. Early opening and late closing port geometry (large opening area) with supercharging is more suitable in higher speed range. Port timing and area, charging pressure, and speed are the main factors that characterize output performance. These preliminary results show a potential for increasing power density by applying two-stroke cycle of the Wankel engine.
Highlights
Internal combustion reciprocating engines are widely applied power sources in industry and transportation
The results revealed that late opening and early closing port geometry with high supercharging pressure has higher performance at low speed range
Port timing and area, charging pressure, and speed are the main factors that characterize output performance. These preliminary results show a potential for increasing power density by applying two-stroke cycle of the Wankel engine
Summary
Internal combustion reciprocating engines are widely applied power sources in industry and transportation. There are many rotary mechanisms that are proposed as internal combustion engine [1]. The interest in these engines arises from their simple rotary motion without reciprocating parts. The Wankel engine is a type of internal combustion engine, and among other rotary types, it is the only one in production. Since the 1950s, beginning with the NSU, besides some companies [2,3], many institutions and researchers have paid attention to the research and development of Wankel engine [4,5]. The main advantages of the Wankel-type rotary engine are higher specific power output and reduced vibration. The main disadvantages are higher fuel consumption and shorter lifetime compared with conventional reciprocating engines
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