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检索条件"任意字段=9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017"

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A study on practical utilization of diesel combustion calculation (a series of studies for automatic diesel engine adaptation) 9

A study on practical utilization of diesel combustion calcul...

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9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Kitada, Taizo Hayashi, Shinji Kuchita, Masato Shigahara, Kei Sakai, Yasuyuki Mitsubishi Motors Corporation 1 Nakashinkiri Hashime-cho Okazaki Aichi Pref.444-8501 Japan Univ. of Fukui 3-9-1 Bunko Fukui Pref.910-8507 Japan

It is much more important these days to utilize CAE techniques to shorten an engine development period and reduce manpower. these advantages surely bring competitiveness for developing new engines. the authors have been developing a diesel combustion calculation code based on KIVA-Waseda. So far, the calculation code is already equipped with the Hiroyasu-NSC(Nagle and Strickland-Constable) model for soot emission and the extended Zeldovich mechanism for NO(nitrogen monoxide) emission. then aiming to utilize the calculation code on engine adaptation works to meet exhaust emission standards, following four items were studied. the first was that the detailed reaction model was modified in order to improve ignition delay estimations. the second was that the chemical reaction calculation speed was increased with two types of unique algorithm. the third was that a calculation system with auto-calculation software and analysis software was prepared to obtain NOx-soot trade-off curves easily, and the fourth was that a prompt-NO model was added to the detailed chemical reaction model to improve NO estimation at low power and high EGR operation conditions. the details of these four studies are described and a series of the calculation measures to obtain a NOx-soot trade-off curve is shown in this paper. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Diesel engines

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Development of a new visualization technique using photochromism for transport process of lubricating oil around the engine piston 9

Development of a new visualization technique using photochro...

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9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Kuratsuji, Kazaki Kitajima, Ikkei Azetsu, Akihiko Department of Mechanical Engineering Tokai University 4-1-1 Kitakaname Hiratsuka-shi Kanagawa259-1292 Japan

In this study, a new method for visualization of oil film flow is proposed and the validity of this method is experimentally confirmed. the proposed method is to visualize the oil film by dissolving a photochromic dye in lubricating oil and coloring with UV rays. this paper explains the basic study of photochromic reaction and the application to flow visualization. Firstly, we quantified the color density of colored solution by applying the absorbance calculated from images before and after coloring. As a result, it was confirmed that the color density was quantified and also oil film thickness can be measured from the absorbance. Secondly, the characteristics of coloring and fading reaction were examined. Consequently, it was confirmed that the increasing energy density of UV rays is effective in improving color density and the optimal energy density of UV rays can be acquired from the model formula of coloring reaction. We also measured the color fading reaction under the different temperature conditions and confirmed the temperature dependence of the solution of Spiropyran and Ester-based oil from an Arrhenius plot. Finally, flow visualization was tried in the complex shape flow channel of approximately ten micrometers in thickness. the test oil flowing through this channel was colored with a focused third harmonic of YAG laser. the distributions of flow velocity and supplied oil to the channel were visualized with this method and confirmed the validity of proposed method. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Temperature distribution

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the interaction of flow-field and turbulence on flame development using high-speed combustion PIV: High temporal and spatial resolved analysis of flame propagation and flame structure in a realistic combustion engine environment 9

The interaction of flow-field and turbulence on flame develo...

引用

9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Le, Minh Khoi Furui, Takashi Nishiyama, Atsushi Ikeda, Yuji Imagineering Inc. 7-4-4 Minatojima-Minami Chuo Kobe650-0047 Japan

the current gasoline engines are being pushed by researchers as well as the manufacturers to meet with the stringent demands and regulations regarding its efficiency, fuel economy and harmful emissions. Ultra-lean burning accompanied by higher turbulence and flow level are currently the best options for these engines to successfully meet these criteria. this study explores the turbulent flame structure inside an real operating engine environment in an attempt to improve the knowledge base of this area and hence provide useful information for engine developers, researchers and simultation models. A newly developed high-speed PIV technique that allows time-resolved measurement of both flame front and flow field simultaneously was applied to observe the flame structure and its relationship to the engine flow and turbulence. the results images demonstrated that the flame propagation is quite influenced by the general flow field and large scale eddies in which it can enhance, diminish and guide the flame propagation. this effect is especially notable in lean burning cases. Flame front generally grows in the direction of existing strong bulk in-cylinder flow and does not propagate if encountering a counter flow. the turbulence level of the unburned area is enhanced in these existing bulk flow stream as the flame propagates through them. Small scale eddies have a strong effect on flame curvatures and wrinkleness which can also help to push the flame propagation through difficult bulk-flow conditions. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Flow fields

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Reduced chemical kinetic mechanism for the prediction of ignition delay time and laminar flame velocity of natural gas combustion 9

Reduced chemical kinetic mechanism for the prediction of ign...

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9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Sakai, Yasuyuki Asano, Yusuke Fujii, Haruki Miyoshi, Akira Department of Mechanical Engineering University of Fukui 3-9-1 Bunkyo Fukui910-8507 Japan School of Engineering Hiroshima University 1-3-2 Kagamiyama Higashi-Hiroshima Hiroshima739-8511 Japan

Chemical kinetics of natural gas combustion receives much attention for the improvement of gas turbine engines with the difficulties of flashback, blow-off and combustion instabilities. this study aimed to develop a skeletal reduction mechanism for the combustion of natural gas. By using a detailed chemical kinetics mechanism of acyclic saturated hydrocarbons composed of up to C7 species, we found that methane, ethane, propane, and n-butane are surrogate components for the prediction of ignition delay time and laminar flame velocity of natural gas. Although minor components from C5 to C7 enhance the reactivity at lower temperatures, the mixture in which these minor species are replaced into n-butane can reproduce the ignition delay time of original natural gas within 25% error. then, we performed the reaction path and sensitivity analysis for the combustion of surrogate components by using a detailed chemical kinetics mechanism, and identified the unnecessary species based on the 5% of branching ratio and sensitivity. the present skeletal reduction mechanism which includes 77 species and 334 reactions can reproduce the ignition delay times and laminar flame velocities predicted by detailed chemical mechanism. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Sensitivity analysis

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A validation study on chemical modeling for the gasoline primary reference fuel and toluene. 9

A validation study on chemical modeling for the gasoline pri...

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9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Izumi, Naoto Fujino, Kouji Oguchi, Tatsuo Department of Mechanical and Systems Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi Aichi441-8580 Japan

A validation study on the chemical reaction models for heptane-isooctane mixing fuel as a primary reference fuel of gasoline (PRF) and heptane-toluene mixing fuel (TRF) was performed by using repetitive compression-expansion reactor (RCER). the mechanism of RCER is similar to a motoring engine, however, the concentration of sample gas in the reactor is regulated like a conventional rapid compression machine (RCM). Experimental conditions were set as follows. the values for initial pressure and temperature were set to 30, 40 kPa and 360 K, respectively. engine speed was set to 600 rpm. Maximum pressure in the reactor reached about 1 MPa from an initial pressure as 30 kPa by compression of air. the dimension of RCER is as follows. Displacement volume is 382 cm3 the compression ratio is 27.5. the initial gas mixtures are charged homogeneously in the reactor and compressed for auto-ignition, that is, the HCCI condition. the ignition timing was delayed by increasing the mixing fraction of isooctane or toluene. Comparing the results and simple chemical kinetics simulations was also performed with two reaction models in the literature. Both models showed similar trends of the delay times as well as the experimental results. However, the retarding effect of a higher fraction of toluene in the fuel mixtures was overestimated in one model despite good agreement each other in the case of heptane alone. It suggests that the toluene reaction model has some problems for the conditions in this study. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Gasoline

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the influence of exhaust line temperature on diesel engine PM 9

The influence of exhaust line temperature on diesel engine P...

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9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Kobayashi, Yoshihiro Toyoda, Shohei Arai, Masataka Department of Mechanical Engineering Tokyo Denki University 5 Senju-asahi-cho Adachi-ku Tokyo120-8551 Japan

PM (Particle Matter) emission exhausted from internal combustion engine is one of the major air pollutants, and its reduction in combustion field is strongly required for future development of internal combustion engine. In order to develop effective after-treatment system to reduce the PM exhausted from diesel engine, PM behavior in exhaust line of small size diesel engine was investigated. In this study, PM number and mass concentration distributions were measured along the exhaust line using SMPS (Scanning Mobility Particle Sizer) and LPI (Low Pressure Impactor). PMs of various sizes were captured by LPI. Volatile and non-volatile compositions in captured PM were separated by drying under 120°C and 240°C. In addition, PM behavior and characteristics at the case of exhaust line heating were also measured. As the result, it was shown that number and mass concentrations of larger size PM at downstream part in exhaust line under high speed low load operation was higher than those of the upstream part. Mass concentration of larger size PM in downstream part at heated exhaust line (380°C) was not as high as that of no heating condition. Mass concentration of PM under 70% load operation increased along exhaust line. Especially, smaller size PM at downstream part in exhaust line under 70% load operation was higher than that of the upstream. Further, mass concentration of PM in downstream part at exhaust line heating condition was higher than that of no heating condition. From these results, additional soot composition in PM seems to be formed in the exhaust line under the high temperature line condition. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Diesel engines

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Online monitoring and feedback control of ignition timing based on ion current signal phase in EGR gasoline engine 9

Online monitoring and feedback control of ignition timing ba...

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9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Zhu, Denghao Li, Liguang Zhang, Fuyuan Chao, Yuedong Deng, Jun Hu, Zongjie School of Automotive Studies Tongji University Shanghai200092 China Chinesisch-Deutsches Hochschulkolleg Tongji University Shanghai200092 China

Based on a 1.3L MPI turbocharged gasoline engine with high and low pressure EGR system, correlation between ion current signal phase and ignition timing under declared operating condition has been studied. the results show that higher EGR rate needs to cooperate more advanced ignition timing, which leads to advanced ion current signal phase. Both under high and low pressure EGR condition, correlation coefficient between ion current signal phase and ignition timing is over 0.7, including 75% experiment points is over 0.9, so ion current signal phase is able to estimate ignition timing. Base on this, an online monitoring and feedback control strategy of ignition timing is proposed, which is employed to record the times of actual ignition timing deviating from ideal ignition timing and adjust ignition timing. the average accuracy rate of online monitoring function is 97.2%. this strategy can help to judge whether the engine operates properly and avoid adverse consequences caused by inaccurate matching of ignition timing and EGR rate. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Exhaust gas recirculation

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Cylinder Wall Temperature Measurement in the Optical engine Using a Flexible Wireless Sensor 9

Cylinder Wall Temperature Measurement in the Optical Engine ...

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9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Kwan, Taejin Lee, Minhyeok Morimoto, Kenichi Suzuki, Yuji Department of Mechanical Engineering University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan

Simultaneous measurements of the cylinder wall temperature at different locations are required to elucidate the heat transfer mechanisms on the cylinder wall of IC engines. In this paper, we present the development of a flexible wireless wall temperature sensor and its performance evaluation using a 4-stroke engine with a glass cylinder. the sensor, corresponding to an LCR resonant circuit, is attached on the inner surface of the cylinder, and its coil is inductively coupled with an external read-out coil that is located outside of the cylinder to measure the resonant frequency wirelessly. A Cu-laminated-polyimide film is used as the substrate of the sensor, on which a 1 mm-wide sensing resistor is sputtered. the resonant frequency is measured in a steady state from the room temperature to 200°C, showing the mean sensitivity of 6.22 kHz/°C. Instantaneous measurement synchronized with the piston movement with a time interval of 1.2 ms is carried out for an optical engine operated at around 700 rpm. Change of permeability with the piston motion is compensated, and the crank angle-resolved cylinder temperature measurement has been made. Near the ignition timing, temperature increase by 44°C is observed, which corresponds to the oncoming flame to the wall. Preliminary simultaneous multipoint measurement is also made with three sensors on the engine cylinder. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Natural frequencies

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Numerical analysis of the effect of various multiple injection strategies on the emissions in a diesel engine 9

Numerical analysis of the effect of various multiple injecti...

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9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Kim, Gyujin Choi, Hoimyung Min, Kyoungdoug Department of Mechanical and Aerospace Engineering Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Department of Mechanical Engineering Gachon University Gyeonggi13120 Korea Republic of

A modified 2-D Flamelet model was further developed and validated under various engine operating conditions. It was extended from 2-D flamelet model (C. Hasse, 2004) by simplifying the calculation procedures in extremely rich and lean region which can reduce the CPU time from the original one. Additionally, the collapsing method (C. Felsch, 2009) was introduced, and the model was extended to quadruple injection by applying the collapsing method twice. the simulation cases cover multiple injection strategies including triple and quadruple injection with different EGR rate, and the simulations were carried out by a commercial light-duty diesel engine with n-heptane skeletal chemical mechanism of which considers 29 species and 52 reactions. Simulation results show that the model can capture auto-ignition, mass and heat transfer of each fuel stream, in-cylinder pressure, heat release rate and NOx emissions under multiple fuel stream conditions. Particularly, the model could analyze the combustion process by the interaction of multiple fuel stream, which gives important information on the emissions reduction by multiple injection strategies. Based on the model, the effect on the advanced injection strategies to the reduction of emissions was quantitatively investigated. the quantitatively investigated results could be specified by analyzing how the change of injection timing, duration and the number of injection event can affect the solution of governing equation and corresponding mixture fraction domain. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Diesel engines

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A study on reduction of cooling loss by water addition in SI engine by using rapid compression and expansion machine 9

A study on reduction of cooling loss by water addition in SI...

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9th international conference on modeling and diagnostics for advanved engine systems, comodia 2017

作者： Yamada, Ryota Sato, Susumu Kosaka, Hidenori Department of Systems and Control Engineering Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo152-8550 Japan

Water injection has attracted attention as one of the techniques for improving thermal efficiency of SI engine. When liquid water is injected in cylinder or inlet manifold, water absorbs the heat of fuel/air mixture due to its evaporation and reduce temperature of mixture. Consequently, it is expected that water injection can reduce cooling loss and suppress knock. the water injection in SI engine so far has been attempted mainly in inlet manifold. Port injection of water forms uniform water vapor distribution in cylinder. On the other hand, this research proposes in-cylinder direct water injection for reduction of cooling loss and suppression of knock effectively with small amount of water by forming low temperature water vapor layer on the wall. In the present paper, in order to investigate the influence of in-cylinder direct water injection on combustion and heat transfer in SI engine, measurements of in-cylinder pressure and wall heat flux and combustion visualization are conducted simultaneously by using rapid compression and expansion machine(RCEM). In order to separate the thermodynamic and chemical effects of water addition, homogeneous mixture of fuel/air/water is introduced into RCEM, and the amount of water and in-cylinder gas temperature are changed independently. Firstly, in order to investigate the chemical effect of water, the amount of water is changed with a constant in-cylinder gas temperature. Secondly, in order to investigate the thermodynamic effect of water, the in-cylinder gas temperature is reduced for simulating the water absorbing heat due to evaporation in cylinder. the obtained results show that addition of water vapor to in-cylinder gas uniformly leads to reduction of wall heat flux and suppression of knock, whereas flame propagation speed remarkably decreases. Copyright © 2017 by the Japan Society of Mechanical engineers.

关键词： Water injection

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