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Two-Stroke Wankel Type Rotary Engine: A New Approach for Higher Power Density

Author

Listed:
  • Osman Akin Kutlar

    (Faculty of Mechanical Engineering, Istanbul Technical University, Istanbul 34437, Turkey)

  • Fatih Malkaz

    (Faculty of Mechanical Engineering, Istanbul Technical University, Istanbul 34437, Turkey)

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.

Suggested Citation

  • Osman Akin Kutlar & Fatih Malkaz, 2019. "Two-Stroke Wankel Type Rotary Engine: A New Approach for Higher Power Density," Energies, MDPI, vol. 12(21), pages 1-22, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4096-:d:280689
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    References listed on IDEAS

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    1. Lev Finkelberg & Alexander Kostuchenkov & Andrei Zelentsov & Vladimir Minin, 2019. "Improvement of Combustion Process of Spark-Ignited Aviation Wankel Engine," Energies, MDPI, vol. 12(12), pages 1-11, June.
    2. Yan Zhang & Jinxiang Liu & Zhengxing Zuo, 2018. "The Study of Turbulent Fluctuation Characteristics in a Small Rotary Engine with a Peripheral Port Based on the Improved Delayed Detached Eddy Simulation Shear-Stress Transport (IDDES-SST) Method," Energies, MDPI, vol. 11(3), pages 1-15, March.
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    Cited by:

    1. Savvas Savvakis & Dimitrios Mertzis & Elias Nassiopoulos & Zissis Samaras, 2020. "A Design of the Compression Chamber and Optimization of the Sealing of a Novel Rotary Internal Combustion Engine Using CFD," Energies, MDPI, vol. 13(9), pages 1-21, May.
    2. Merve Kucuk & Ali Surmen & Ramazan Sener, 2022. "Influence of Hydrogen Enrichment Strategy on Performance Characteristics, Combustion and Emissions of a Rotary Engine for Unmanned Aerial Vehicles (UAVs)," Energies, MDPI, vol. 15(24), pages 1-22, December.
    3. Shimon Pisnoy & Leonid Tartakovsky, 2021. "Numerical Investigation of the Combined Influence of Three-Plug Arrangement and Slot Positioning on Wankel Engine Performance," Energies, MDPI, vol. 14(4), pages 1-18, February.
    4. Wang, Huaiyu & Ji, Changwei & Shi, Cheng & Yang, Jinxin & Wang, Shuofeng & Ge, Yunshan & Chang, Ke & Meng, Hao & Wang, Xin, 2023. "Multi-objective optimization of a hydrogen-fueled Wankel rotary engine based on machine learning and genetic algorithm," Energy, Elsevier, vol. 263(PD).

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