On the Heat-Release Analysis of Diesel Engines: Effects of Filtering of Pressure Data

Theobald, Mark A.; Alkidas, Alexandras C.

doi:10.4271/872059

Cited by 26 publications

(10 citation statements)

References 11 publications

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“…As known, concerning the study of the combustion process in diesel engines, a very important means to analyse combustion characteristics is the calculation and analysis of heat release rates according to actual measurements of pressures in the (main) chamber (and the pre-chamber, if any) [29,[47][48][49]. Also, a companion diagram of the fuel injection pressure assists towards this side.…”

Section: Short Literature Reviewmentioning

confidence: 99%

The combustion of n-butanol/diesel fuel blends and its cyclic variability in a direct injection diesel engine

Rakopoulos

Giakoumis

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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An experimental study is conducted to evaluate the effects of using blends of diesel fuel with n-butanol (normal butanol) up to 24 per cent (by volume), which is a promising fuel that can be produced from biomass (bio-butanol), on the combustion behaviour of a standard, high-speed, direct injection (DI), 'Hydra' diesel engine located at the authors' laboratory. Combustion chamber and fuel injection pressure diagrams are obtained at four different loads using a developed, high-speed, data acquisition, and processing system. A heat release analysis of the experimentally obtained cylinder pressure diagrams is developed and used. Plots of histories in the combustion chamber of the gross heat release rate and other related parameters reveal some interesting features, which shed light on the combustion mechanism when using these blends. These results, combined with the differing physical and chemical properties of the n-butanol against those for the diesel fuel, aid the correct interpretation of the observed engine behaviour performance based on and emissions. Moreover, given the concern for the rather low cetane number of the n-butanol that may promote cyclic (combustion) variability, its strength is also examined as reflected in the pressure indicator diagrams, by analysing for the maximum pressure and its rate, dynamic injection timing and ignition delay, by using stochastic analysis for averages, standard deviations, probability density functions, autocorrelation, power spectra, and cross-correlation coefficients.

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Section: Short Literature Reviewmentioning

confidence: 99%

The combustion of n-butanol/diesel fuel blends and its cyclic variability in a direct injection diesel engine

Rakopoulos

Giakoumis

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Then, the 'mean' of the cylinder (indicator) and the fuel pressure diagrams are obtained, while a 'light smoothing' for the pressure signals is applied [51,52,55] that is based on performing a four-data points weighted smoothing. This seems to offer a reasonable compromise between no loss of valuable signal information and of relatively smooth values for the first derivative of pressure with respect to crank angle.…”

Section: Preliminary Treatment Of the Experimental Pressure Diagrams mentioning

confidence: 99%

“…As known, concerning the study of the combustion process in diesel engines, either of the DI or the IDI (indirect injection) type, a very important means to analyze combustion characteristics is the calculation and analysis of heat release rates according to actual measurements of pressures in the (main) chamber (and the pre-chamber, if any) [50][51][52][53][54][55]. Also, a companion diagram of the fuel injection pressure assists towards this side.…”

Section: Article In Pressmentioning

confidence: 99%

Experimental heat release analysis and emissions of a HSDI diesel engine fueled with ethanol–diesel fuel blends

Rakopoulos

Antonopoulos

Rakopoulos

2007

Energy

282

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“…To solve these problems independently, laborious research based on statistical data should be performed. Therefore, most of researchers prefer an experimental study (Schmidt, Van Gerpen 1996;A Comprehensive Analysis of… 2002;Lü et al 2004;Kumar et al 2006;Theobald, Alkidas 1987).…”

Section: The Selection and Modification Of Models To Be Used In Compumentioning

confidence: 99%

“…There is a limited number of studies of the particular parameters of engines burning biofuels (Rakopoulos et al 2006(Rakopoulos et al , 2007Rakopoulos, Hountalas 1998;Theobald, Alkidas 1987;Choi et al 1997), based on mathematical modelling. For example, the temperature field of the combustion products in the diesel engine cylinder was investigated at University of Wisconsin, using KI-VA-II, a modern program of modelling the in-cylinder process of a diesel engine burning biofuels (Choi et al 1997).…”

Section: The Selection and Modification Of Models To Be Used In Compumentioning

confidence: 99%

Modifying Mathematical Models for Calculating Operational Characteristics of Diesel Engines Burning Rme Biofuels / Matematinių Modelių Pritaikymas Dyzelių, Dirbančių Rme Biodegalais, Darbo Procesui Ir Eksploataciniams Rodikliams Skaičiuoti / Доработка Математических Моделей Расчета Показателей Работы Дизеля На Биодизелинах Ррмэ

2011

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The article considers and solves the problems of adapting the mathematical models, used in calculating operational characteristics of diesel engines burning mineral diesel oil, to engines converted to RME biofuels. The analysis of mathematical models of calculating the main technical and economic characteristics of diesel engines as well as the parameters of the in-cylinder process and the concentration of toxic substances in the exhaust gases is performed. The need for adjusting the calculation algorithms is also demonstrated. The computer programs based on single-zone thermodynamic models are used in the research. The programs of mathematical modelling are modified, i.e. supplemented with the algorithm for calculating energy characteristics of the combustion products (e.g. specific heat capacity, internal heat, the lower calorific value, etc.). Based on the computer programs, modified for examining diesel engines burning biofuels, the computer-aided mathematical modelling experiment is carried out. The results of modelling are compared with the data obtained in testing the diesel engine 1A41. The mathematical modelling performed demonstrates the accuracy acceptable for solving practical problems: the difference between the obtained calculation results and diesel engine testing data for the load range of (1.0÷0.5) P i nom does not exceed ± 5÷7%. Higher accuracy of modelling the characteristics of diesel engines, operating in the low-and medium-load modes, may be accounted for by the adjustment of the algorithm for calculating the induction period and the on-set phase of fuel injection.

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On the Heat-Release Analysis of Diesel Engines: Effects of Filtering of Pressure Data

Cited by 26 publications

References 11 publications

The combustion of n-butanol/diesel fuel blends and its cyclic variability in a direct injection diesel engine

The combustion of n-butanol/diesel fuel blends and its cyclic variability in a direct injection diesel engine

Experimental heat release analysis and emissions of a HSDI diesel engine fueled with ethanol–diesel fuel blends

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