Can the Best Fuel Economy of Today's Engines Still Be Improved?

Heitland, Herbert; Rinne, Gerhart; Wisłocki, Krzysztof

doi:10.4271/981912

“…Presented in the paper [21], as well as in [14][15][16], possibilities of stratification of a charge with noncombustible gases (separation of air and exhaust gases) allowed the Authors to choose the concept of a combustion system from among several earlier proposals.…”

Section: Motivation For Undertaking the Research Issuesmentioning

confidence: 99%

“…Some ideas of applying of flue gases for reduction in intensity of nitrogen oxides formation was formulated in early 80-th of XX c. However, the level of development of fuelling systems was not high enough for any spectacular progress at this time. Next ideas of this kind were proposed in 1993 by Heitland et al [14]. Based on the patent application from early 1993 designed for twostroke engines [15] they suggested to generate the region of air-fuel mixture in the central part of combustion chamber which should be surrounded by exhaust gases from previous cycle.…”

Section: Introductionmentioning

confidence: 99%

Optical study of the use of recirculated gases for adiabatization of combustion process in the SIDI engine

Cieślik

¹

,

Pielecha

²

,

Wisłocki

³

2017

MATEC Web Conf.

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0

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Abstract. Proper delivery of gaseous components of the charge into the combustion chamber enables controlling of combustion in the aspect of adiabatization of the process. The adiabatization obtained as result of surrounding of combustible mixture by recirculated exhaust gases should contribute to reducing formation of harmful components created during this process. The key issue here is the formation of radicals, which is not sufficiently recognized according fuels surrounded by non-combustible gases. The innovative nature of this work ensues from the experimental confirmation of so defined organizing of combustion process. Currently there are no tests concerning attempts of gas separation in the combustion chamber of engine with external source of ignition. Such separation would contribute to the increase of the adiabatization process while at the same time the combustion rate increases and reduces the combustion duration. This paper presents the next stage of research, which were preceded by simulation and experimental investigations. In the article the results of the impact of the strategy of non-combustible gas injections on combustion ratios for cylinder head with a centrally positioned ignition point have been discussed. The analysis has been based on the photo material for the period from the start of ignition to full coverage of the cylinder by the flame. Authors performed a comparative analysis (against the recorded images) of the thermodynamic indexes of the combustion process obtained from the indicator traces.

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“…Certainly, it can be stated that from the very beginning of the development of combustion engines, the improvement of their total (fuel conversion) efficiency was one of the main goals of the inventors and designers [1].…”

Section: Introductionmentioning

confidence: 99%

Application of VNT Turbocharger in Spark Ignition Engine with Additional Expansion of Exhaust Gases

Noga

¹

2018

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The paper provides an analysis of a VNT-type turbocharger implementation influence on operating parameters of the spark-ignition engine with additional expansion of exhaust gases. Previously, the research of the engine was performed with a charging system composed of a turbocharger with a simple waste-gate valve. The research was done mainly in order to improve the engine's performance for lower rotational speed range. The second reason of the described modification was to obtain lower fuel consumption. The four series of tests with boost pressure rising gradually from 0 to 0.8 bar were conducted for rotational speed of range 2000-3200 rpm. The described analysis of the obtained results showed that application of the VNT-type turbocharger caused significantly improved performances of the engine, especially in a lower rotational speed region. Also, decrease in the brake specific fuel consumption of the spark ignition engine with additional expansion of exhaust gases has been achieved for the rotational speed of value 2400 rpm.

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“…Certainly, it can be stated that from the very beginning of the development of combustion engines, the improvement of their total (fuel conversion) efficiency was one of the main goals of the inventors and designers [1].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

Teh. vjesn.

0

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The paper provides an analysis of a VNT-type turbocharger implementation influence on operating parameters of the spark-ignition engine with additional expansion of exhaust gases. Previously, the research of the engine was performed with a charging system composed of a turbocharger with a simple waste-gate valve. The research was done mainly in order to improve the engine's performance for lower rotational speed range. The second reason of the described modification was to obtain lower fuel consumption. The four series of tests with boost pressure rising gradually from 0 to 0.8 bar were conducted for rotational speed of range 2000-3200 rpm. The described analysis of the obtained results showed that application of the VNT-type turbocharger caused significantly improved performances of the engine, especially in a lower rotational speed region. Also, decrease in the brake specific fuel consumption of the spark ignition engine with additional expansion of exhaust gases has been achieved for the rotational speed of value 2400 rpm.

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Can the Best Fuel Economy of Today's Engines Still Be Improved?

Cited by 8 publications

References 5 publications

Optical study of the use of recirculated gases for adiabatization of combustion process in the SIDI engine

Optical study of the use of recirculated gases for adiabatization of combustion process in the SIDI engine

Application of VNT Turbocharger in Spark Ignition Engine with Additional Expansion of Exhaust Gases

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