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Dergiler / International Journal of Automotive Science and Technology / 2025 / Volume: 9 Issue: 4

Combustion and Emission Behaviour of a HCCI Wankel Engine Across Lambda Variations: Insights for Future Aviation-Oriented Rotary Engine Concepts

Ömer Türkcan(BOZOK UNIVERSITY)0000-0001-5004-7227
Seyfi Polat(HİTİT ÜNİVERSİTESİ)0000-0002-7196-3053
Sayfa
—
Yayın Tarihi
2025-12-31
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⚡ TL;DR(1 Cümlede Hızlı Çıkarım)

These results underscore the potential of Wankel HCCI concepts for lightweight aviation and unmanned aerial vehicle (UAV) propulsion, while highlighting the need for improved mixture preparation and combustion-phasing control for practical implementation.

📌 3 Maddede Bu Makale

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Amaç & Hipotez:This study examines the combustion and emission behavior of a four-stroke Wankel rotary engine operated in Homogeneous Charge Compression Ignition (HCCI) mode using n-heptane fuel over excess-air ratios of λ = 2.2–2.8.
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Temel Bulgular & Veri:A validated three-dimensional CONVERGE CFD model of the Mazda Renesis RX-8 13B MSP engine—verified against experimental spark-ignition pressure data—was used to assess HCCI performance.
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Sonuç & Katkı:These results underscore the potential of Wankel HCCI concepts for lightweight aviation and unmanned aerial vehicle (UAV) propulsion, while highlighting the need for improved mixture preparation and combustion-phasing control for practical implementation.
🔬Tür:Modelleme & Sayısal Simülasyon
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Aviation · hcci · wankel

Abstract

This study examines the combustion and emission behavior of a four-stroke Wankel rotary engine operated in Homogeneous Charge Compression Ignition (HCCI) mode using n-heptane fuel over excess-air ratios of λ = 2.2–2.8. A validated three-dimensional CONVERGE CFD model of the Mazda Renesis RX-8 13B MSP engine—verified against experimental spark-ignition pressure data—was used to assess HCCI performance. The simulations employed semi detailed chemistry (SAGE), Renormalization Group (RNG) k–ε turbulence modelling, and adaptive mesh refinement to capture the multi-stage auto-ignition process. The analysis encompassed key combustion and emission indicators, including in-cylinder and peak pressure, heat-release rate, cumulative heat-release behavior, maximum pressure-rise rate, combustion-phasing metrics crank angle at 10% of total heat released (CA10), crank angle at 50% of total heat released (CA50), crank angle at 90% of total heat released (CA90), combustion duration, and major exhaust species carbon monoxide (CO), carbon dioxide (CO2), hydrocarbons (HC) and nitrogen oxides (NOₓ). Stable HCCI operation was achieved only within a narrow range: λ = 2.2–2.8. Richer mixtures exceeded the 10 bar/°CA knock-related pressure-rise-rate limit, while leaner mixtures resulted in misfire. Increasing λ delayed auto-ignition, weakened high-temperature oxidation, and extended combustion duration. CO and HC emissions rose with λ due to reduced combustion temperature and strong near-wall quenching driven by the Wankel chamber’s high surface-to-volume ratio, whereas NOx remained extremely low and nearly eliminated for λ ≥ 2.4. Overall, the findings confirm that HCCI can be successfully realized in a Wankel rotary engine with ultra-low NOx emissions, provided operation remains within its narrow λ window. These results underscore the potential of Wankel HCCI concepts for lightweight aviation and unmanned aerial vehicle (UAV) propulsion, while highlighting the need for improved mixture preparation and combustion-phasing control for practical implementation.

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Bu Makaleye Atıf Yap

Türkcan, Ö., Polat, S. (2025). Combustion and Emission Behaviour of a HCCI Wankel Engine Across Lambda Variations: Insights for Future Aviation-Oriented Rotary Engine Concepts. International Journal of Automotive Science and Technology, Volume: 9 Issue: 4. https://doi.org/10.30939/ijastech..1821778

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