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Proceedings of the 8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

Proceedings of the 8th International Conference on Modeling ...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

the proceedings contain 111 papers and 7 PowerPoint presentations. the topics discussed include: experimental and modeling study of the effects of equivalence ratio on the benzene formation chemistry of one-dimensional laminar premixed n-heptane flames;three dimensional measurement of vectors of the flamelet motion and gas velocity in a turbulent premixed flame;chemiluminescence spectroscopy of C2 swan band to explore the flame temperature;diagnostics of in cylinder flow during compression using PIV and analysis using proper orthogonal decomposition;a control strategy analysis for clean and efficient combustion in compression ignition engines;model-based control for ignition timing of premixed compression ignition combustion in a diesel engine;aromatic additive effects on soot formation in a Fischer-Tropsch Diesel (FTD) spray flame via laser spectroscopy;and application of tunable diode laser absorption spectroscopy with optical hollow fiber to engine exhaust gas measurement.

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the internal combustion engine - the key for future propulsion

The internal combustion engine - The key for future propulsi...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

作者： Pischinger, Stefan Heuser, Benedikt FEV GmbH Germany VKA RWTH Aachen University Germany

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A study on the applicability of a mechanical supercharger to a diesel engine for the commercial vehicle

A study on the applicability of a mechanical supercharger to...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

作者： Ishikawa, Naoya Itoh, Hikaru Nitta, Junichiro Energy Technology Research Department Isuzu Advanced Engineering Center Ltd 8 Tsuchidana Fujisawa city Kanagawa 252-0881 Japan

A supercharging system comprising of a mechanical supercharger and a turbo charger was investigated with experimental and numerical analysis in a diesel engine for use in a commercial vehicle. the frictional losses of the mechanical supercharger were reduced by putting it together with a turbo charger. Furthermore, it was found that the fuel consumption of the vehicle could be improved by optimizing power train specifications. this was accomplished due to the increased low-end torque which was enabled by a mechanical *** © 2012 by the Japan Society of Mechanical engineers.

关键词： Commercial vehicles

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Multi-cycle LES based analysis of cycle-to-cycle variations of combustion processes in HCCI engine

Multi-cycle LES based analysis of cycle-to-cycle variations ...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

作者： Goryntsev, Dmitry Sadiki, Amsini Janicka, Johannes Technical University of Darmstadt Petersenstraße 30 Darmstadt 64287 Germany

the Homogeneous Charge Compression Ignition (HCCI) is still a promising concept to optimize internal combustion (IC) engines with respect to emissions. the cycle-to-cycle variations of in-cylinder flow play an important role in HCCI combustion processes and can result in combustion instability due to the lean as well as knock combustion conditions. In order to characterize mentioned above effects, the Large Eddy Simulation (LES) has proved to be a reliable method. Multi-cycle LES based analysis has been carried out on a motored engine configuration to characterize the unsteady effects of HCCI combustion processes for both fully premixed mixture and early-direct spray injection cases. In-cylinder pressure and temperature as a function of crank angle were analyzed in terms of mean and standard deviation. Copyright © 2012 by the Japan Society of Mechanical engineers.

关键词： Large eddy simulation

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Understanding of the combustion characteristics of rotary engine through combustion analysis

Understanding of the combustion characteristics of rotary en...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

作者： Yun, Jyong-Ho Yasunaga, Yuichiro Itonaka, Ryo Ito, Tatsuo Ueki, Shinya Powertrain Thechnology Development Dept. RE Developmet Gr. Mazda Motor Corporation 3-1 Shinchi Fuchu-cho Aki-gun Hiroshima 730-8670 Japan

Combustion behaviors of gasoline rotary engines (hereinafter referred to as "RE") are different from those of reciprocating engines (that is conventional engines, and hereinafter referred to as "CE"), due to differences in its operating principle. So understanding of RE unique phenomena is essential to improve its thermal efficiencies. thus, in order to understand the mechanism of RE combustion, Mazda has analyzed heat balance calculated from engine indicated pressure, visualized combustion state on a bench test engine, simulated their combustion properties, and created a combustion simulation model based on these experimental results. this paper will introduce findings from these activities, points of observations on characteristics of RE combustion, and examples of combustion improvements. Copyright © 2012 by the Japan Society of Mechanical engineers.

关键词： Rotary engines

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Strategies for reducing the computational time required for diesel engine simulations with KIVA

Strategies for reducing the computational time required for ...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

作者： Cantrell, Benjamin A. Reitz, Rolf D. Rutland, Christopher J. Immamori, Yusuke Engine Research Center University of Wisconsin-Madison 1500 Engineering Drive Madison WI 53706 United States

A modified CFD code based on the KIVA family of codes incorporating several strategies for reducing the computational time required for diesel engine simulations is presented. these strategies, all of which may be applied simultaneously, include the following: (1) a dynamic maximum time step model, (2) spray models that reduce mesh dependencies, (3) a coarse axisymmetric non-polar sector mesh with relatively uniform cell sizes, (4) a parallel CHEMKIN combustion model using MPI with load balancing, and (5) a radius of influence chemistry cell grouping method. the average wall time required for a simulation of a Mitsubishi Heavy Industries heavy-duty diesel engine from IVC to EVO is reduced from 60 hours to 40 minutes through the use of 12 processors and the strategies described in this *** © 2012 by the Japan Society of Mechanical engineers.

关键词： Computational fluid dynamics

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Multi-fuel and mixed-mode IC engine combustion simulation with a detailed chemistry based progress variable library approach

Multi-fuel and mixed-mode IC engine combustion simulation wi...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

作者： Bo, Tao Rawat, Rajesh Johns, Richard Mauss, Fabian CD-Adapco United States Brandenburg University of Technology Germany

In order to meet challenging efficiency and emission target, modern engine design is more likely to involve mixed-mode of combustion as well as multiple fuels. In order to accurately predict the process of such combustion in CFD, detailed chemistry based modelling approach is required. this paper introduces the concept of Progress Variable Library Model for Multi-fuel (PVM-MF) Combustion. PVM-MF is designed to model mixed-mode of combustion with multiple fuels while keeping the computational cost low due to the use of the pre-computed libraries. the paper summarizes the application of PVM-MF in four typical modes of engine combustion, namely premixed, non-premixed, compression ignition and mixed mode. the implementation of this model in STAR-CD CFD code is described. To demonstrate the application of the model some IC engine cases are also presented. Copyright © 2012 by the Japan Society of Mechanical engineers.

关键词： Fuels

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Application of tunable diode laser absorption spectroscopy with optical hollow fiber to engine exhaust gas measurement

Application of tunable diode laser absorption spectroscopy w...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

作者： Adachi, Akira Yoshihiro, Deguchi Konishi, Shinichirou School of Advanced Technology and Science University of Tokushima 1 banchi 2 Cyoume Mimamijyousanjima Tokushima 770-8506 Japan

Recent years have already seen tighter regulation on harmful substances such as NOx, CO, and particles. Considering the above situation, it is important to monitor controlling factors of engine systems in order to improve efficiencies of their operations. In car engines an increasing concern in environmental issues such as air pollution, global warming and petroleum depletion has helped drive researches into various ways. Laser diagnostics has been applied to measure species concentration in the actual industrial fields. However there are several challenges to proceed in applying laser diagnostics to practical application. Especially stability of the measurement system is one of the most difficult issues. the purpose of this research is the development of a prompt measurement technique which can be applicable to various engine conditions. the tunable diode laser absorption spectroscopy(TDLAS) using the hollow fiber has been developed to satisfy above requirements. By using a hollow fiber, misalignment of an optical axis and vulnerability of measurement environment such as vibration can be greatly reduced with sensitive and fast response features. It was demonstrated that this method can be applicable to measure gas compositions in engine exhaust with a range of millisecond response time. A sensitive method using tunable UV diode laser absorption spectroscopy was also discussed to detect NOx in exhausts. Copyright © 2012 by the Japan Society of Mechanical engineers.

关键词： Laser diagnostics

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Effect of engine oil mist on cyclic variation of a diesel engine with hydrogen

Effect of engine oil mist on cyclic variation of a diesel en...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

作者： Matsubara, Jun Yagenji, Takashi Miyamoto, Toru Seo, Takehiko Mikami, Masato Kabashima, Hajime Department of Mechanical Engineering Yamaguchi University 2-16-1 Tokiwadai Ube Yamaguchi 755-8611 Japan Honda R and D Co. Ltd. 4630 Shimotanenezawa Haga-Machi Haga-Gun Tochigi 321-3393 Japan

the present study experimentally investigated combustion characteristics of a diesel engine with hydrogen and blowby components added to the intake air. In our previous studies, the ignition delay decreased with the increase in hydrogen fraction at late diesel-fuel injection timings. However, it is difficult to auto-ignite hydrogen earlier than diesel fuel, because the auto-ignition temperature of hydrogen is higher than that of diesel fuel. there must be some factors to ignite hydrogen. We focus on reaction of blowby components as a cause of hydrogen ignition earlier than diesel-fuel ignition. Copyright © 2012 by the Japan Society of Mechanical engineers.

关键词： Diesel engines

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Laser-induced fluorescence to visualize gas mixture formation in an optically accessible hydrogen engine

Laser-induced fluorescence to visualize gas mixture formatio...

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8th international conference on modeling and diagnostics for advanced engine systems, comodia 2012

作者： Mederer, thomas Wensing, Michael Leipertz, Alfred Friedrich-Alexander Universität Erlangen-Nürnberg Am Weichselgarten 8 Erlangen 91058 Germany

the established tracer laser-induced fluorescence (LIF) technique was newly adapted for the quantitative visualization of hydrogen inside an optically accessible hydrogen engine to investigate the processes of hydrogen-injection, mixture formation, ignition and combustion at motor-relevant operating points. Trimethylamine (TMA) has been seeded to the hydrogen and was thus used as a tracer for hydrogen when applying the LIF technique. End of injection (EOI) was varied at a constant speed of 2000 rpm and a load of 2 bar (IMEP) which represents typical part load condition. the results visualize the influence of EOI on the mixture formation, ignition and the beginning of combustion. the comparison of the visual results of four operating points shows how long it takes even in the case of hydrogen to get a homogeneous mixture at spark timing. Additionally, conventional engine data such as cylinder pressure, temperature, consumption, emissions etc. have been measured. Rough running engine due to uneven distribution in the region of the spark plug could be explained by single-shot images. Copyright © 2012 by the Japan Society of Mechanical engineers.

关键词： Direct injection

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