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Dergiler / International Journal of Automotive Engineering and Technologies / 2026 / Cilt: 12 Sayı: 3

Estimation of the shape factor (m) in Wiebe function at different operating conditions for a SI engine

Hüseyin Emre Doğan(KARAMANOĞLU MEHMETBEY ÜNİVERSİTESİ, MÜHENDİSLİK FAKÜLTESİ)0000-0002-9445-3697
Abdurrahman Demirci(KARAMANOGLU MEHMETBEY UNIVERSITY)0000-0002-2569-5174
Akın Kutlar(İSTANBUL TEKNİK ÜNİVERSİTESİ, MAKİNE FAKÜLTESİ)0000-0002-4795-3541
Sayfa
75–82
Yayın Tarihi
2023-09-30
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⚡ TL;DR(1 Cümlede Hızlı Çıkarım)

Eventually, a linear regression model, which explains 80% of the change in the shape factor, was created.

📌 3 Maddede Bu Makale

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Amaç & Hipotez:The burning process is one of the most important periods, which affects thermal efficiency and exhaust gas emissions, in internal combustion engines.
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Temel Bulgular & Veri:The Wiebe equation is an approach used in calculating the mass fraction burned and the heat release rate.
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Sonuç & Katkı:Eventually, a linear regression model, which explains 80% of the change in the shape factor, was created.
🔬Tür:Modelleme & Sayısal Simülasyon
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Mass fraction burned · Combustion process · Heat release rate

Abstract

The burning process is one of the most important periods, which affects thermal efficiency and exhaust gas emissions, in internal combustion engines. The combustion process in internal combustion engines is modeled with one-dimensional or multi-dimensional software because it is cheaper, faster, and more practical than experiment. One of these methods, which is used to model the combustion period, is the Wiebe function. The Wiebe equation is an approach used in calculating the mass fraction burned and the heat release rate. The selection of Wiebe parameters is one of the most important factors affecting the accuracy of the mass fraction burned. In this study, the measured cylinder pressure of a spark ignition engine was directly used to calculate the heat released rate. The experiments were conducted at different brake mean effective pressures, engine speeds and relative air/fuel ratios, which were called independent variables. The shape factor (m) was determined by fitting the Wiebe equation to the heat release rate curves, which were extracted from the experimental results. The relationship between determined shape factor and independent variables was analyzed with a statistical approach. Eventually, a linear regression model, which explains 80% of the change in the shape factor, was created.

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Bu Makaleye Atıf Yap

Doğan, H. E., Demirci, A., Kutlar, A. (2023). Estimation of the shape factor (m) in Wiebe function at different operating conditions for a SI engine. International Journal of Automotive Engineering and Technologies, Cilt: 12 Sayı: 3, 75–82. https://doi.org/10.18245/ijaet.1234678

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