Aportación al diagnóstico de la combustión en motores Diesel de inyección directa

Díaz, Jaime Martín

doi:10.4995/thesis/10251/135955

Cited by 8 publications

(8 citation statements)

References 40 publications

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“…are constant values and C w1 , C w2 = C w1 /1.7 and C 2 are model fitting constants [40]. In motoring conditions p = p 0 , therefore the last term of Equation (16), which accounts for the gas velocity variation due to combustion is equal to zero, thus obtaining the following expression:…”

Section: Chamber Heat Transfer Model Adjustmentmentioning

confidence: 99%

Improvement and application of a methodology to perform the Global Energy Balance in internal combustion engines. Part 1: Global Energy Balance tool development and calibration

Payri

López

Martín

et al. 2018

Energy

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The increasingly stringent internal combustion engines emissions regulations, has led to the extended use of aftertreatment systems, giving progressively more importance to the engine efficiency optimization. In this framework, the combined modelling and experimental methodologies to perform and analyse the energy balance are key to evaluate the potential of different engine strategies aimed at the consumption optimization and the identification of the improvement paths. This work has been divided into two parts, dealing separately with the development and application of a global energy balance tool. This article corresponds to the first part, which comprises the description of the models required to perform a detailed energy balance and the calibration methodologies followed to achieve accurate energy terms estimation. The models are calibrated based on experimental information, thus, a thermodynamic analysis aimed at defining comparable quantities between experimental and modelled terms is performed. The uncertainty analysis of the tool shows a deviation in the determination of the heat transfer to the coolant and the oil of about ±2%, and in terms of fuel energy about ±1%.

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Section: Chamber Heat Transfer Model Adjustmentmentioning

confidence: 99%

Improvement and application of a methodology to perform the Global Energy Balance in internal combustion engines. Part 1: Global Energy Balance tool development and calibration

Payri

López

Martín

et al. 2018

Energy

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show abstract

“…where C=0.12 and C2=0.001, D is the cylinder diameter, p and T are the in-cylinder pressure and temperature, cm is the mean piston speed, cu is the instantaneous tangential velocity of the gas in the chamber due to the swirl motion (see [50] for the details of the calculation), CW1 is a constant fitted in the iterative process using data from motoring tests, CW2 value is CW1 divided by 1.7 [51], Vd and VIVC are the displaced volume and the volume at the intake valve closing, respectively, and p0 is the motoring pressure assuming a polytropic evolution.…”

Section: Effective Compression Ratio Characterizationmentioning

confidence: 99%

Redesign and Characterization of a Single-Cylinder Optical Research Engine to Allow Full Optical Access and Fast Cleaning during Combustion Studies

et al. 2017

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This work describes the update of an optical engine design with the aim of increasing its capabilities when used for combustion studies. The criteria followed to perform the optical engine redesign were: maximize the optical accessibility to the combustion chamber, minimize the time consumed to clean the optical parts, and minimize the adaptation costs. To meet these requirements, a modular design using window-holders to fit the windows in the optical flange, was proposed. This novel solution allows optical access near the cylinder-head plane while maintaining high operating flexibility (i.e. fast transition between optical and metal engine, and very fast cleaning procedure). The new engine design has three additional optical accesses to the combustion chamber and resulted in more efficient operation compared to the original design, reducing the time consumed to clean the optical parts from 40 down to 10 minutes. Two main parameters of the new engine were characterized, the effective compression ratio and the rotatory flow field velocity (swirl). The characterization process revealed very similar values between the effective and geometric compression ratios (14.7:1 vs 14.2:1), which confirms the use of appropriate dimensional tolerances during the machining process and low amount of blow-by. Finally, the swirl ratio was characterized through particle image velocimetry measurements for different crank timings at 1200 rpm and motored conditions, using the optical piston with a cylindrical bowl. This method revealed swirl ratios varying from 1 to 1.7 depending on the timing considered, with increasing trend as the piston moves towards the top dead center.

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“…Además de los distintos desarrollos y correlaciones de transferencia de calor en los cilindros del motor, otro tema importante son los modelos numéricos utilizados para la optimización del diseño de los ICE. El modelado del tipo cilindro por cilindro define el tratamiento del aporte energético del combustible, describiendo el comportamiento de la tasa de liberación de calor cuando se realiza la ignición [26]. De este tipo de trabajos se destacan los aportes de O.…”

Section: Introductionunclassified

Caracterización de la tasa de liberación de calor en los cilindros de un motor de generación a gas natural de 2 MW.

Valencia

Forero

Peñaloza

2020

AiBi Revista de Investigación, Administración e Ingeniería

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Desarrollar modelos matemáticos para los motores de generación de energía más confiables que permitan proponer un uso eficiente de los combustibles y aumentar la eficiencia de conversión energética, se ha convertido en uno de los principales objetivos de los trabajos de investigación en el área. Con el fin de estudiar el fenómeno liberación de calor en los cilindros de un motor a gas natural J612 Jenbacher de 2 MW a partir de variables medias disponibles en registros operacionales, se ha propuesto un modelo semifísico a partir de balances de masa, energía, ecuaciones constitutivas y regresiones estadísticas. Los resultados muestran que a partir del modelo propuesto del calor rechazado con un coeficiente de determinación de 0.99, el permiten alcanzar un error relativo máximo de 2% en modo isla y del 4% operando en red para la estimación de la temperatura de los gases a las salidas de los cilindros. Así mismo, el modelo permite determinar la fracción de calor perdido en los cilindros en función de la energía aportada por el gas natural

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Aportación al diagnóstico de la combustión en motores Diesel de inyección directa

Cited by 8 publications

References 40 publications

Improvement and application of a methodology to perform the Global Energy Balance in internal combustion engines. Part 1: Global Energy Balance tool development and calibration

Improvement and application of a methodology to perform the Global Energy Balance in internal combustion engines. Part 1: Global Energy Balance tool development and calibration

Redesign and Characterization of a Single-Cylinder Optical Research Engine to Allow Full Optical Access and Fast Cleaning during Combustion Studies

Caracterización de la tasa de liberación de calor en los cilindros de un motor de generación a gas natural de 2 MW.

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