Thermodynamic Analysis of Self-Ignition in Spark-Ignited Engines Operated with Alternative Gaseous Fuels

ResumenIntroducción− Actualmente, el modelado termodinámico de diagnóstico en un motor diésel es una herramienta ampliamente usada tomando como base los datos de presión dentro del cilindro. No obstante, su estudio requiere el ajuste de submodelos a través de procesos iterativos que demandan un excesivo gasto de tiempo y altas incertidumbres. Entre estos submodelos se encuentra el de volumen instantáneo en la cámara de combustión, ya que la biela es un elemento altamente deformable por su bajo módulo de rigidez y, por ende, esta variación afecta al trabajo mecánico de expansión calculado para el balance de energía global. Objetivo− En este estudio se busca implementar una metodología para la caracterización del volumen instantáneo en la cámara de combustión orientada a su estimación de manera rápida y precisa mediante el software ANSYS®. Metodología− Se realizó la caracterización de un motor diésel utilizando los datos de la presión medida en el cilindro correspondientes a ensayos en arrastre (sin combustión) para los regímenes de 1000, 1700 y 2400 rpm. Resultados− Los resultados obtenidos en la simulación y validados experimentalmente indican que la metodología propuesta genera homocedasticidad en el coeficiente de ajuste Kdef, el cual tiene un valor de 0,701 para el motor en estudio y se mantiene casi constante, independientemente del régimen de giro. Conclusiones− Se verifica también que se logra una mejor predicción del volumen real de la cámara de combustión con la metodología desarrollada, a la vez que el factor de ajuste propuesto Kdef permite el ajuste del modelo teórico planteado y absorbe las incertidumbres propias de modelado de este tipo de sistemas. Palabras clave− Ajuste, deformación, simulación, motor diésel, volumen instantáneo Abstract Introduction− Currently, diagnostic thermodynamic modeling in diesel engines is a widely-used tool which is based on the pressure data inside the cylinder. However, its study requires the adjustment of submodels through iterative processes that demand excessive time and high uncertainties. Among these submodels is the instantaneous volume in the combustion chamber, since the connecting rod is a highly deformable element due to its low modulus of rigidity and, therefore, this variation affects the mechanical expansion work calculated for the global energy balance. Objective− In this study, are trying to implement a methodology for the characterization of the instantaneous volume in the combustion chamber oriented to its estimation in a fast and precise way using the ANSYS® software. Methodology− The characterization of a diesel engine was performed using data of pressure measured in the cylinder corresponding to tests in drag (without combustion) for the regimes of 1000, 1700 and 2400 rpm. Results− The results obtained in the simulation and experimentally validated indicate that the proposed methodology generates homoscedasticity in the Kdef adjustment coefficient, which has a value of 0.701 for the engine under study and remains almost constant regardless of the r...

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“…El volumen contenido en el cilindro, cuando no se consideran los efectos de las variaciones instantá-neas, se compone de dos términos [5], [29]:…”

Section: A Formulación Del Modelo Matemáticounclassified

Development of a methodology for the prediction of the real volume in the combustion chamber of diesel engines using finite elements

2018

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“…The load condition becomes vital since it determines, to a great extent, the fuel consumption and the thermo-mechanical behavior of the engine [4]- [6]. Additionally, implementing a load bank allows evaluating the influence of the load rate on the feasibility of partial fuel substitution technologies such as biofuel blends and hydrogen enrichment [7], [8]. Most of the studies regarding the experimental test bench of diesel engines rarely characterized the construction and implementation of the load bank, despite being important equipment of the experimental layout.…”

Section: Introductionmentioning

confidence: 99%

Implementation of a 3.5 kW resistive load bank for a single-cylinder diesel engine test bench

2020

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This article presents the implementation of a 3.5 kW resistive load bank applied to a four-stroke single-cylinder diesel engine test bench that operates with an alternator. With this experimental test bench, it is possible to perform mechanical, thermodynamic, and polluting emissions studies in compression-ignited or induced internal combustion engines. Applying the quantitative research methodology, the design of the electric charging system is carried out. Power control circuits and safety elements are designed for the load back. CAD software is used to design the structure and casing considering anthropometric measurements. Also, finite element analysis (FEA) is incorporated to verify the structural and thermal design criteria. he implementation of an electrical and instrumentation acceleration system for sensing power and torque in low-displacement engines showed a measurement error of less than 1%. Similarly, the FEA allowed to quantify the maximum efforts and guarantee a safety factor above 5. With the characterization of the implemented sensors, a correlation coefficient of up to 99.97% was achieved. The power measurement displayed an error lower than 3%, which leads to a high characterization capacity of any thermal machine with equal power or less than the designed one.

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Method for evaluating the parameters of the flame front propagation process according to the indicator diagram in spark ignition engines

Smolenskaya

Смоленский

Корнеев

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The paper presents a methodology for evaluating the parameters of the flame front propagation process using the experimentally obtained indicator pressure diagram in spark ignition engines. The proposed method allows us to determine the main parameters of the flame front propagation process (flame front propagation velocity, flame front heat release rate, flame front thickness, temperature of the burned mixture and temperature of the unburned mixture) from the experimental pressure indicator diagram obtained for a spark ignition engine.

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Thermodynamic Analysis of Self-Ignition in Spark-Ignited Engines Operated with Alternative Gaseous Fuels

Cited by 3 publications

References 4 publications

Development of a methodology for the prediction of the real volume in the combustion chamber of diesel engines using finite elements

Development of a methodology for the prediction of the real volume in the combustion chamber of diesel engines using finite elements

Implementation of a 3.5 kW resistive load bank for a single-cylinder diesel engine test bench

Method for evaluating the parameters of the flame front propagation process according to the indicator diagram in spark ignition engines

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