Determination of the theorethical and total efficiency of the five-stroke SI engine

Noga, Marcin; Sendyka, B.

doi:10.1007/s12239-014-0112-9

Cited by 12 publications

(11 citation statements)

References 4 publications

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“…This leads to a significant increase in the thermal efficiency of the theoretical comparative cycle of the engine [4], but also gives tangible benefits in the effective efficiency of the engine performing such a cycle [5]. Figure 1 presents the concept of using an increased expansion ratio to improve the efficiency of an internal combustion engine.…”

Section: Introductionmentioning

confidence: 99%

“…The mentioned value of ε dcp allows us to obtain a relatively high degree of energy recovery of the exhaust gas in the additional expansion cylinders at wide open throttle (WOT). In one study [5], the results of the theoretical calculations of the increase of the thermal efficiency of an engine cycle with the additional expansion were presented. To standardize the analysis of the engine cycle, processes are described as though the additional expansion was carried out in the same working volume.…”

Section: Introductionmentioning

confidence: 99%

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Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process

Noga

2017

Applied Sciences

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Abstract:The paper presents the results of research on the turbocharged spark ignition engine with additional exhaust expansion in a separate cylinder, which is commonly known as the five-stroke engine. The research engine has been constructed based on the four cylinder engine in which two outer cylinders work as the fired cylinders, while two internally connected inner cylinders constitute the volume of the additional expansion process. The engine represents a powertrain realizing an ultra-expansion cycle. The purpose of the study was to find an effective additional expansion process in the five-stroke engine. Cylinder-pressure indicating measurements were carried out for one of the fired cylinders and the additional expansion cylinder. The study was performed for over 20 different points on the engine operation map. This allowed us to determine a dependence between the pressure indicated in the fired cylinders and in the additional expansion cylinders. A function of the mean pressure indicated in the additional expansion cylinder versus a brake mean effective pressure was also presented. This showed a load threshold from which the work of the cylinders of additional expansion produced benefits for the output of the experimental engine. The issues of mechanical efficiency and effective efficiency of this engine were also discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process

Noga

2017

Applied Sciences

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“…Ano to the intake stroke with t ee process [23 mized area [9] . One of the w rgy of the bur n a normal en o of the exh ratio [10][11][12] le of the class n of exhaust g a Figure 1. der five-stroke e expansion cylin 5 -intake mani valves, 8 -exh of the five-s m working on t in [25,26].…”

Section: Introductionmentioning

confidence: 99%

Various aspects of research of the SI engine with an additional expansion process

Noga

2017

MATEC Web Conf.

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Abstract. The paper presents an analysis of the results of the both experimental results and theoretical works on the SI engine with additional expansion of exhaust gases, also known as five-stroke engine. The engine like this was constructed at Cracow University of Technology as a retrofitted in-line four cylinder engine in which outer cylinders (1st and 4th) work as fired cylinders and inner cylinders (2nd and 3rd) work as volume for the additional expansion. The aim of development of such an engine is to gain higher energy recovery ratio of the combusted fuel through the second expansion of exhaust in a separate cylinder. The operating parameters of the engine in various versions were analyzed: as naturally aspirated, supercharged using a turbocharger with a waste-gate valve and a turbocharger with variable nozzle turbine. Selected results of the indicating measurements of the engine with special emphasis on the indicated thermal efficiency were presented. The results pointed out the directions of further optimization of the engine. These results are all the more important, because according to the author's knowledge, the research on the real object of this type are carried out in only one science center in the world besides Cracow University of Technology.

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“…The engine thermal efficiency is strongly dependent on the compression ratio [2,3] and used fuel [4][5][6]. The high octane number of CNG (120-130) allows for compression ratio of up to 16, without any fear of engine knocking [1].…”

Section: Introductionmentioning

confidence: 99%

Turbulent spark-jet ignition in SI gas fuelled engine

et al. 2017

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Abstract. The article contains a thermodynamic analysis of a new combustion system that allows the combustion of stratified gas mixtures with mean air excess coefficient in the range 1.4-1.8. Spark ignition was used in the pre-chamber that has been mounted in the engine cylinder head and contained a rich mixture out of which a turbulent flow of ignited mixture is ejected. It allows spark-jet ignition and the turbulent combustion of the lean mixture in the main combustion chamber. This resulted in a two-stage combustion system for lean mixtures. The experimental study has been conducted using a single-cylinder test engine with a geometric compression ratio  = 15.5 adapted for natural gas supply. The tests were performed at engine speed n = 2000 rpm under stationary engine load when the engine operating parameters and toxic compounds emissions have been recorded. Analysis of the results allowed to conclude that the evaluated combustion system offers large flexibility in the initiation of charge ignition through an appropriate control of the fuel quantities supplied into the pre-chamber and into the main combustion chamber. The research concluded with determining the charge ignition criterion for a suitably divided total fuel dose fed to the cylinder.

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Determination of the theorethical and total efficiency of the five-stroke SI engine

Cited by 12 publications

References 4 publications

Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process

Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process

Various aspects of research of the SI engine with an additional expansion process

Turbulent spark-jet ignition in SI gas fuelled engine

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