Evaluation of heat transfer correlations for HCCI engine modeling

Soyhan, HS; Yaşar, Halit; Walmsley, H.L.; Head, B.; Kalghatgi, GT Gautam; Soruşbay, Cem

doi:10.1016/j.applthermaleng.2008.03.014

Cited by 125 publications

(55 citation statements)

References 16 publications

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“…In this study, the modified Woschni correlation by Assanis [26] is applied during the simulations. The heat loss mechanism affects the evolution of a simulation.…”

Section: Mathematical Modelmentioning

confidence: 99%

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Egüz

Maes

Leermakers

et al. 2013

Int.J Automot. Technol.

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Premixed charge compression ignition (PCCI) is a clean and efficient alternative for classical diesel combustion. The concept of PCCI combustion is associated with early injection of the fuel whilst applying high exhaust gas recirculation (EGR) levels and operation with a highly lean mixture such that ignition takes place (well) after the injection event. Thus, it is possible to reduce soot and oxides of nitrogen (NO x ) emissions simultaneously. PCCI combustion is analyzed using a multi-zone model. In the multi-zone model, chemical mechanisms which are much more detailed compared to those used in computational fluid dynamics (CFD) approaches can be introduced directly. The CFD model is still used to predict the initial fuel stratification in the cylinder which is important to improve the quality of the model. For the analysis, dedicated experiments with n-heptane are used to evaluate the results of the model. In such a multi-zone model, 10 zones prove to be sufficient to describe the stratification with adequate resolution. It is observed that different fuel distributions have a large influence on the emissions when there is no mixing between the zones. To overcome this dependence, a basic inter-zonal diffusive 2 mixing is applied. The level of mixing is estimated with a sensitivity study. When the inter-zonal mixing is included, emission results become much less sensitive to the crank angle (CA) at which the charge stratification is sampled and the simulation is initialized.

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“…In this study, the modified Woschni correlation by Assanis [26] is applied during the simulations. The heat loss mechanism affects the evolution of a simulation.…”

Section: Mathematical Modelmentioning

confidence: 99%

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Egüz

Maes

Leermakers

et al. 2013

Int.J Automot. Technol.

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“…Modelleme çalışmalarında kullanılan SPICE yazılım programı esas olarak SI motor analizi için geliştirilmiş bir yazılım olup, bir Avrupa Birliği projesi (FP-6) kapsamında modifiye edilerek HCCI motor analizine uygun hale getirilmiştir [28][29]. Program, tek-bölgeli termo-kimyasal yapıda bir program olup, silindir basınç ve sıcaklığı ile birlikte motor performans değerlerini tahmin etmektedir.…”

Section: Model (Model)unclassified

“…HCCI motorlarla ilgili modelleme çalışmalarında 0-Boyutlu modeller çok yaygın olarak kullanılmaktadır [24][25][26][27][28][29]. Bu modeller, çok-bölgeli ve tek-bölgeli olabilirler.…”

Section: Gi̇ri̇ş (Introduction)unclassified

“…İkincisi ise HCCI motorlarda ana yanma fazındaki yanma hızı ile geç yanma fazındaki yanma hızı arasında büyük farklar bulunmaktadır. Bu nedenle, HCCI motorlarda yanma olayının modellenmesinde Wiebe fonksiyonunun modifiye edilmiş bir şekli olan Double-Wiebe fonksiyonunun kullanılması çok daha iyi sonuçlar vermektedir [28,29].…”

Section: Gi̇ri̇ş (Introduction)unclassified

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Homojen Karışımlı Sıkıştırma Ateşlemeli (HCCI) Bir Motorun Tek Bölgeli Modelleme Yöntemi Kullanılarak Analizi

Yaşar¹

2016

SAUFenBilDer

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ÖZHCCI motorların modellenmesinde sıfır-boyutlu modeller yaygın olarak kullanılmaktadır. Bu modeller tek veya çok bölge içerebilirler. Bununla birlikte, en basit yaklaşım yanmış ve yanmamış gazı içeren tek bölge yaklaşımıdır. Bu tip sıfır-boyutlu modellerde yanma olayı Wiebe fonksiyonu ile modellenmektedir. Bu makalede, HCCI prensibine göre çalışan tek silindirli bir Ricardo Hydra motoru tek bölge yaklaşımı kullanılarak modellenmiştir. Analiz çalışmalarında SPICE (Simulated Petrol Internal Combustion Engine) yazılımının modifiye edilmiş bir versiyonu olan TRICE yazılımı kullanılmıştır. Yanma analizlerinde, HCCI yanma modellerinde standart Wiebe fonksiyonu kullanımının maksimum silindir basıncının yüksek olarak tahmin edilmesi sonucunu doğurması nedeniyle, standart Wiebe fonksiyonunun modifiye edilmiş bir şekli olan Double-Wiebe fonksiyonu kullanılmıştır. Analizler, n-Heptan-Toluen karışımı için üç hava fazlalık katsayısı değerinde gerçekleştirilmiş ve elde edilen sonuçlar bir Avrupa Komisyonu Marie Curie destek programı (FP-6) projesi kapsamında Shell Araştırma Merkezine ait motor test laboratuvarında ölçülen deneysel verilerle karşılaştırılmıştır.Anahtar Kelimeler: HCCI motor, tek-bölgeli modelleme, net ısı yayılımı, dilindir basıncı Analysis of a Homogeneous Charge Compression Ignition (HCCI) engineby using a single-zone modelling method ABSTRACT Zero-dimensional models are commonly used to model HCCI engines. These models may contain single or multi zones. However, the simplest approach is the single-zone containing burned and unburned gases. In these type models, combustion progress is modelled by Wiebe function. In this article, a single-cylinder Ricardo Hydra engine, which is running in HCCI mode, was modelled by using single-zone method. In the analysis, a modified Shell SI engine code called TRICE was used. This code is a modified version of SPICE (Simulated Petrol Internal Combustion Engine) and modified for HCCI engine. In the combustion analysis, a modified Wiebe function called double-Wiebe function was used since standard Wiebe-function tends to over-predict the peak cylinder pressure in HCCI combustion models. The analses were performed for n-Heptane-Toluene blend with three excess air ratios and the results were compared to the experimental data measured in the engine test laboratuary of Shell Research Centre within an European Commission Marie Curie Transfer of Knowledge Scheme (FP6) project.

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“…Because the radiative heat transfer accounts for only 5% of the total heat flux in an SI engine, it is usually neglected [7]. The convective heat transfer is a transient process, but can be assumed 15 to be quasi-steady. This allows the definition of a convection coefficient (h) according to Eq.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in premixed spark ignition engines part I: Identification of the factors influencing heat transfer

Broekaert

Demuynck

Cuyper

et al. 2016

Energy

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The heat transfer from the combustion gases to the cylinder walls inside a spark ignition engine is a key factor in an engine's design, due to its influence on the engine's efficiency, power and emissions. Therefore a lot of research has been conducted in order to accurately model the heat transfer, for engine design and optimization purposes. These models have been found to provide inaccurate predictions for fuels which have significantly different gas properties compared to traditional fossil fuels. This indicates that the models either do not properly include gas properties, or are missing some important properties in their formulation. In order to construct a general ("fuel-independent") heat transfer model, new measurements need to be executed, with multiple fuels that have different properties. Designing such an experiment requires a thorough understanding of the factors influencing the heat transfer and their interactions. In this paper a literature review is presented of heat transfer measurements in spark ignition engines in order to investigate the effect of the engine factors on the heat transfer. Based on this review, a root cause analysis is conducted to identify the independent factors that affect heat transfer. These factors are then used to set up two experiments according to a Design of Experiments methodology that allows the investigation of the effect of different gas properties and engine settings on the heat transfer in a consistent way. The results of these measurements for motored operation are discussed in [1] and for fired operation in a companion paper [2].

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Evaluation of heat transfer correlations for HCCI engine modeling

Cited by 125 publications

References 16 publications

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Homojen Karışımlı Sıkıştırma Ateşlemeli (HCCI) Bir Motorun Tek Bölgeli Modelleme Yöntemi Kullanılarak Analizi

Heat transfer in premixed spark ignition engines part I: Identification of the factors influencing heat transfer

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