Heat transfer model for small-scale air-cooled spark-ignition four-stroke engines

Because Asian countries have a large number of motorcycles, motorcycle engine exhaust emission poses a major problem in the region. Homogeneous charge compression ignition (HCCI) is a promising combustion technology with high efficiency and low nitrogen oxide emission. This study investigated the combustion characteristics of HCCI in a 150 cc motorcycle engine with three types of dual fuel. The main fuels consisted of dimethyl ether (DME), kerosene, and nheptane, and gasoline was the additive fuel. External exhaust gas recirculation (EGR) was used to expand the operating range of the engine. All test points were executed under stable HCCI operation with a coefficient of variation < 5%. A total of 107 data sets were obtained by adjusting the amount of main fuel, additive fuel, and EGR. Two-stage ignition was observed because of the diesel-like main fuels. The results revealed that the temperature at the start of combustion was approximately 500-700 K, and the temperature of the first-stage maximum heat release rate (MHRR1) was approximately 600-800 K. The relationship between the crank angle (CA) at which the mass fraction burnt is 50% (CA50) and the CAs of the maximum cylinder pressure, maximum cylinder gas temperature, and MHRR were linear. The R square for the curve fitting of each relationship was > 0.9. The findings suggest that adjusting the CA50 to a value greater than 5° after top dead center, or limiting the maximum cylinder pressure to < 50 bar is crucial to preventing excessive pressure rising. Overall, kerosene was deemed unsuitable for engines because of its high sulfur content, whereas DME is considered an excellent option.

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“…A heat transfer model for motorcycles was proposed by Wu et al (2006). The specific heat ratio γ is a function of temperature.…”

Section: Heat Release Rate Calculationmentioning

confidence: 99%

Experimental Study on HCCI Combustion in a Small Engine with Various Fuels and EGR

Chen

Wang

2016

Aerosol Air Qual. Res.

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“…The heat transfer rate _ Q ht from the flowing gas to the combustion chamber wall is dominated by the forced convection [7,8] and can be expressed as: …”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…engines. Since the heat transfer characteristics of small-scale engine are different from that of large-scale engine, the authors of this paper [7] had ever proposed a heat transfer model specific for four-stroke small-scale S.I. engines using Stanton number.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer model for small-scale spark-ignition engines

Chen

Hsieh

et al. 2009

International Journal of Heat and Mass Transfer

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“…These approaches implicitly assume errors that can be acceptable for heat balances but can involve uncertainties in simulation cycles or temperature distribution analyses. It should be noticed that some authors, after having identified one correlation for one small-scale air-cooled engine [18], acknowledge that those correlation parameters are not valid for another small scale air-cooled engine with similar characteristics [19].…”

Section: Introductionmentioning

confidence: 99%

Methodology for the estimation of cylinder inner surface temperature in an air-cooled engine

Trujillo

Aguilar

Villanueva

et al. 2011

Applied Thermal Engineering

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A methodology for the estimation of the mean temperature of the cylinder inner surface in an air-cooled internal combustion engine is proposed. Knowledge of this temperature is necessary to determine the heat flux from the combustion chamber to the cylinder wall. Along with the heat transfer coefficient this parameter also allows almost 50% of engine heat losses to be determined. The temperature is relatively easy to determine for water-cooled engines but this is not in the case for air-cooled engines. The methodology described here combines numerical and experimental procedures. Simulations were based on FEM models and experiments were based on the use of thermocouples and infrared thermography. The methodology avoids the use of data or correlations developed for other engines, providing more reliable results than extrapolating models from one engine to another. It also prevents from taking measurements from inside the combustion chamber, reducing invasion and experiments complexity. The proposed methodology has been successfully applied to an air-cooled four-stroke directinjection diesel engine and it allows the cylinder mean inner surface temperature and cylindercooling air heat transfer coefficient to be estimated.

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Heat transfer model for small-scale air-cooled spark-ignition four-stroke engines

Cited by 42 publications

References 16 publications

Experimental Study on HCCI Combustion in a Small Engine with Various Fuels and EGR

Experimental Study on HCCI Combustion in a Small Engine with Various Fuels and EGR

Heat transfer model for small-scale spark-ignition engines

Methodology for the estimation of cylinder inner surface temperature in an air-cooled engine

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