Comparison of cycle-by-cycle variation of measured exhaust-gas temperature and in-cylinder pressure measurements

Morey, F.; Seers, Patrice

doi:10.1016/j.applthermaleng.2009.10.011

Cited by 18 publications

(7 citation statements)

References 13 publications

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“…The exhaust gas temperature exhibited a high sensitivity to dynamic phenomena and ease in its measurement. As such, it is usually used for diagnosing combustion performance of the fuel and for monitoring combustion anomalies [19,20], in the design and operation of exhaust gas recirculation (EGR) [19], as well as for prediction using emission models [22]. Additionally, to obtain detailed information about the combustion process, the in-cylinder pressure values were also monitored.…”

Section: Performance Characteristics During Transient Operationmentioning

confidence: 99%

Effect of Biodiesel Blends on the Transient Performance of Compression Ignition Engines

2021

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Prior to full electric conversion, internal combustion engines will still maintain a paramount position in heavy goods and earth-moving vehicles. The most promising, cleaner alternative to fossil fuels is biodiesel. While it does not require alterations in the engine design, hence no major overhaul of existing infrastructure, biodiesel is more sustainable and clean-burning than petro-diesel. Extensive research has been reported on the effect of biodiesel blends, on the operational characteristics of compression ignition (CI) engines as well as the emissions behaviour of such engines. The performance characteristics of CI engines under transient operational conditions with Biodiesel blends has had limited attention so far from researchers. In the present work, transient performance characteristics of a CI engine has been evaluated for various biodiesel blends and its effects on performance behaviour have been quantified. In addition, emission footprints of CI engines under various transient operational conditions have also been enumerated.

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Section: Performance Characteristics During Transient Operationmentioning

confidence: 99%

Effect of Biodiesel Blends on the Transient Performance of Compression Ignition Engines

2021

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“…A f is the area of the spherical flame front. During combustion, these equations are coupled with the thermodynamic ones, Equations (4)- (6). Laminar burning speed is obtained from Gülder's model [24] and u t , l t from the empirical correlations built up by Keck [22].…”

Section: Simulated Model: Theoretical Backgroundmentioning

confidence: 99%

“…In fact, during the last years, many researchers have investigated CV either experimentally or by means of theoretical methods, including nonlinear dynamics and chaos theory [1,4,5]. From a practical engineering viewpoint, monitoring cycle-to-cycle variations can enable closed-loop control over engine parameters, such as fuel metering or spark timing, in order to reduce fuel consumption and increase power output or other performance records [6,7]. Reduction of cycle-to-cycle variations could allow the engine to operate under average conditions closer to the limiting ones, improving performance related to driveability, increased power output, overall efficiency and reduced environmental impact [8,9].…”

Section: Introductionmentioning

confidence: 99%

Fluctuations in the Energetic Properties of a Spark-Ignition Engine Model with Variability

Curto-Risso

Medina

Hernández

et al. 2013

Entropy

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We study the energetic functions obtained in a simulated spark-ignited engine that incorporates cyclic variability through a quasi-dimensional combustion model. Our analyses are focused on the effects of the fuel-air equivalence ratio of the mixture simultaneously over the cycle-to-cycle fluctuations of heat release (Q R ) and the performance outputs, such as the power (P ) and the efficiency (η). We explore the fluctuant behavior for Q R , P and η related to random variations of the basic physical parameters in an entrainment or eddy-burning combustion model. P and η show triangle shaped first return maps, while Q R exhibits a structured map, especially at intermediated fuel-air ratios. Structure disappears to a considerable extent in the case of heat release and close-to-stoichiometry fuel-air ratios. By analyzing the fractal dimension to explore the presence of correlations at different scales, we find that whereas Q R displays short-range correlations for intermediate values of the fuel ratio, both P and η are characterized by a single scaling exponent, denoting irregular fluctuations. A novel noisy loop-shaped P vs. η plot for a large number of engine cycles Entropy 2013, 15 3278 is obtained. This plot, which evidences different levels of irreversibilities as the fuel ratio changes, becomes the observed loop P vs. η curve when fluctuations are disregarded, and thus, only the mean values for efficiency and power are considered.

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“…Combustion initiation, i.e. spark discharge, kernel and flame front development, extinguishing of flame on combustion chamber walls, spark advance etc [5,10].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…The quality and quantity of the air-fuel mixture: its mass and composition, stratification inside the cylinder, the intensity and scale of turbulence, fuel atomization and vaporization level [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of cycle-to-cycle variation and non-uniformity of energy production: Tests on individual cylinders of a radial piston engine

Czarnigowski

2011

Applied Thermal Engineering

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The paper presents results of identification tests on radial piston engine non-uniformity and nonrepeatability of energy production. The tests are a part of the ASz-62IR engine modernization project aimed at extending the engine's service life and decreasing fuel consumption. This is to be achieved by substituting a carburetor with an electronic injection control system. The tests consisted in measurements of in-cylinder pressure in each cylinder and were conducted under differing operating conditions. The paper focuses on the analysis of the indicated mean effective pressure (IMEP) as a parameter describing the amount of energy produced by the cylinders.IMEP mean values indicate significant differences in the amount of energy produced by individual cylinders. A further difference can be observed in the cycle-to-cycle variation of individual cylinders; it consists not only in the non-uniform standard deviation of IMEP, but also in the non-uniformity of IMEP, represented by the forgetting factor. The range of cylinder-tocylinder variations has been evaluated and attributed to the non-uniform supply with the air-fuel mixture -a result of using a carburetor and an ignition system with fixed settings.

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Comparison of cycle-by-cycle variation of measured exhaust-gas temperature and in-cylinder pressure measurements

Cited by 18 publications

References 13 publications

Effect of Biodiesel Blends on the Transient Performance of Compression Ignition Engines

Effect of Biodiesel Blends on the Transient Performance of Compression Ignition Engines

Fluctuations in the Energetic Properties of a Spark-Ignition Engine Model with Variability

Analysis of cycle-to-cycle variation and non-uniformity of energy production: Tests on individual cylinders of a radial piston engine

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