• Title/Summary/Keyword: Gasoline Fuel

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Determination of Atmospheric Lead in Suwon City (수원지역의 대기 중 Pb의 농도 결정)

  • Lee, Tae-Jung;Kim, Seoun-Cheon;Kim, Dong-Sool
    • Journal of Environmental Science International
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    • v.4 no.5
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    • pp.149-149
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    • 1995
  • Monitoring of lead concentration in the ambient alt was performed in Kyung Hee University-Suwon Campus over a period of 5 year from November 1989 to September 1994 using a cascade impactor having 9 size stages. Lead level was analyzed by x-ray fluorescence. The lead levels have been extensively examined to identify annual trends, seasonal variations, and size distribution of lead concentration. Even though consumption of leaded gasoline has been decreased, the levels have not significantly changed during the sampling period. Probably other sources like fossil fuel emission and refuse incinerator will be potential contributors. The seasonal variation showed that Pb concentration significantly increased in the winter season and decreased in the summer season. The size distributions of Pb were observed to be unimodal distribution of the 1.1∼2.1 $mu extrm{m}$ sixte ranges in the winter and 0.65∼1.1 ㎛ in the summer.

A Study on the Effect of Fast Burn for Different Combustion Chamber Geometries of Gasoline Engine Using an Ion Current Method (이온전류법에 의한 가솔린엔진 연소실 형상별 급속연소효과 연구)

  • 강건용;서승우;정동수;장영준
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.6
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    • pp.1633-1639
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    • 1993
  • In spark ignition engine, EGR of lean mixture operation has advantage in emission, but disadvantages in power output and combustion flame propagation. Fast burn system is known to be a useful method to solve these disadvantages. This paper presents the characteristics of in-cylinder flow for different combustion chamber geometries, and the correlation between the in-cylinder flow and the combustion flame speed using an ion current method.

A study on the heat release rate pattern variation according to the change of operating conditions in pre-combution chamber type diesel engine (예연소실식 디젤기관의 운전조건변화에 따른 열발생률 형태변동에 관한 고찰)

  • 이진우;최재성;전효중
    • Journal of Advanced Marine Engineering and Technology
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    • v.11 no.3
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    • pp.31-44
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    • 1987
  • Nowadays, the problems of energy and environmental pollution become serious day by day and the diesel engine, which has been proved to be superior to gasoline engine with respect to fuel consumption and ecological problems of exhaust gas, has been adopted widely for various purposes from the marine diesel engine and the dynamo engine to all kinds of engine on land. Therefore, extensive parametric studies on combustion of diesel engine should be done for its desing and improvement. To predict the behavior of diesel engien according to variable operating conditions by means of cycle simulation, the reasonable pattern of heat release rate has to be asumed. But it is necessary to know the actual variation of heat release rate in order to assume the reasonable pattern of heat release rate according to the actual operating conditions. In this paper, on a high speed small bore diesel engine with pre-combustion chamber, experimental investigations were carried out to determine the relationship between the heat release pattern and parameters such as engine load and speed. And also, the theoretical investigations about the performance variations of the above diesel engine according to the predicted pattern of heat release rate variation were performed. From the above observations, it may be said that the Fanboro indicator, which was used to get the cylinder pressure, can be used to estimate a reasonable pattern of heat release rate and it is confirmed that the pattern of heat release rate for the pre-combustion type engine is different from that of the direct injection type engine.

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An Experimental Study on Smoke Movement by the External Wind in Road Tunnel Fires (도로터널 화재 시 외부 바람에 의한 연기거동 특성에 관한 실험적 연구)

  • Lee, Sung-Ryong
    • Tunnel and Underground Space
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    • v.24 no.4
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    • pp.308-315
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    • 2014
  • In this study, reduced scale experiments were carried out to evaluate the effect of external wind in a road tunnel fire. Experiments were conducted in a $1.1m{\times}0.5m{\times}50.4m$ tunnel. 4.5 litter gasoline was used as a fuel. Temperature, oxygen and carbon monoxide concentration were measured. Smoke reaching time to the tunnel exit was affected by the external wind. When a fire was fully developed, wind effect is reduced compared with the early stage of a fire. CO concentration was reached at more than 1,500 ppm.

An Investigation on Flow and Structural Characteristics of Heat Exchanger in Rankine Steam Cycle for Co-generation System (기관 폐열 회수를 위한 열교환기의 Baffle 길이 변경에 따른 성능 예측에 관한 수치 해석적 연구)

  • Ryu, Kyuhyenn;Kim, Kusung;Lee, Younghum;Kang, Seokho;Park, Gibeom
    • New & Renewable Energy
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    • v.9 no.4
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    • pp.32-39
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    • 2013
  • A 2-loop waste heat recovery system with Rankine steam cycles for the improvement of fuel efficiency of gasoline vehicles has been investigated. A high temperature loop is used to recover waste heat from exhaust gas and a low temperature loop is used to recover waste heat from cold engine coolant. This paper has dealt with a layout of low temperature loop system, the review of the velocity contours through numerical analysis. According to the result of analysis, the designed heat exchanger. And comparing with flow analysis results, LT Boiler is safe to operation.

The Performance Analysis of Otto Cycle Engine by Thermodynamic Second Law (오토 사이클 기관의 열역학 제 2법칙적 성능 해석)

  • 김성수;노승탁
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.6
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    • pp.94-102
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    • 2001
  • The thermodynamic second law analysis, which means available energy or exergy analysis, for the indicated performance of Otto cycle engine has been carried out. Each operating process of the engine is simplified and modeled into the thermodynamic cycle. The calculation of the lost work and exergy through each process has been done with the thermodynamic relations and experimental data. The experimental data were measured from the test of single cylinder Otto cycle engine which operated at 2500 rpm, WOT(Wide Open Throttle) and MBT(Minimum advanced spark timing for Best Torque) condition with different fuels: gasoline, methanol and mixture of butane-methanol called M90. Experimental data such as cylinder pressure, air and fuel flow rate, exhaust gas temperature, inlet gas temperature and etc. were used for the analysis. The proposed model and procedure of the analysis are verified through the comparison of the work done in the study with experimental results. The calculated results show that the greatest lost work is generated during combustion process. And the lost work during expansion, exhaust, compression and induction process follows in order.

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Effect of Economic Analysis an Introduction HSDI Diesel Passenger Cars (HSDI 경유승용차 도입의 경제적 효과분석)

  • 임기추
    • Journal of Energy Engineering
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    • v.10 no.3
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    • pp.177-182
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    • 2001
  • This paper aims at evaluating HSDI diesel passenger cars introduction. The result of economic analysis after accounting for the life cycle cost per car shows a saving of 13,836 thousand won in fuel cost per diesel car assuming a life of 10 years and the annual travel distance of 20,000km. Assuming an average travel distance of 20,000km and a 10% increase in sales of diesel passenger car, the social benefit starts to accrue from the year 2002 and, in 2010, is estimated to be 154.1 billion won relative to the gasoline passenger car. The cumulative social benefit up to 2010 under the same assumptions is expected to reach 636.8 billion won.

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Measurement and Analysis of Liquid Film Thickness of Pressure-Swirl Spray for Direct-Injection Gasoline-Engines (직접분사식 가솔린엔진용 고압 스월분무의 액막두께 측정 및 해석)

  • Moon, Seok-Su;Abo-Serie, Essam;Oh, Hee-Chang;Bae, Choong-Sik
    • Journal of ILASS-Korea
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    • v.12 no.4
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    • pp.211-219
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    • 2007
  • The liquid film thickness inside a pressure-swirl nozzle was measured, and then the measured liquid film thickness was compared with the results from previous empirical equations. The liquid film inside the nozzle was visualized using extended transparent nozzles and a microscopic imaging system, and then the measurement error was evaluated using optical geometry analysis. The high injection pressures up to 7MPa were adopted to simulate the injection conditions of the direct-injection spark-ignition engines. The totally different two injectors with different fuels, nozzle lengths, nozzle diameters and swirlers were utilized to obtain the comprehensive equations. The results showed that the liquid film thickness very slightly decreased at high injection pressures and the empirical equations overestimated the effect of injection pressure. Most of empirical equations did not include the effect of nozzle length and swirler angle, although it caused significant change in liquid film thickness. A new empirical equation was suggested based on the experimental results with the effects of fuel properties, injection pressure, nozzle diameter, nozzle length and swirler angle.

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Influence of Propane and Butane on Engine Performance in a Homogeneous Charge Compression Ignition(HCCI) Engine (균질혼합압축점화기관에서 프로판과 부탄연료가 기관성능에 미치는 영향)

  • Choi Gyeung Ho;Kim Ji Moon;Han Sung Bin
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.29 no.3 s.234
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    • pp.417-423
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    • 2005
  • This paper describes the engine performance of a Homogeneous Charge Compression Ignition(HCCI) engine according to Exhaust Gas Recirculation(EGR), cylinder-to-cylinder, fuel of propane and butane. HCCI engines are being considered as a future alternative for diesel and gasoline engines. HCCI engines have the potential for high efficiency, very low NOx emissions and very low particulate matter(PM). On experimental work, we have done an evaluation of operating conditions in a 4-cylinder compression engine. The engine has been run with propane and butane fuels at a constant speed of 1800rpm. This work is intended to investigate the HCCI operation of the engine in this configuration that has been modified from the base diesel engine. The performance and emissions of the engine are presented. In this paper, the start of combustion(SOC) is defined as the $50{\%}$ point of the peak rate of heat release. SOC is delayed slightly with increasing EGR. As expected, NOx emissions were very low for all EGR range and nbuned HC and CO emission levels were high. CO and HC emissions are lower with using propane than butane as fuels of HCCI engines.

Characteristics of Exhaust Gas Temperature and Harmful Emission During Cold Start Transient Operation in an SI Engine (가솔린엔진의 냉시동 천이구간에서 배출가스 온도 및 유해배출물 특성에 관한 연구)

  • Cho, Yong-Seok;Jeong, Dae-Chul;Park, Young-Joon;Kim, Duk-Sang
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.30 no.12 s.255
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    • pp.1181-1187
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    • 2006
  • Stringent regulations of exhaust emission from vehicles become a major issue in automotive industries. In SI engines, it is one of the crucial factor to reduce exhaust emissions during cold start in order to meet stringent regulations such as SULEV or EURO-4, because SI engines emit a large portion of total harmful exhaust compounds when they are cold. At early stages of cold start in gasoline engines, exhaust gas temperature plays a key role to improve three way catalyst by virtue of fast warmup. Therefore, this study focused on the increase of exhaust gas temperature under controls of engine operating parameters such as spark ignition timing, valve overlap by virtue of intake VVT and catalyst heating function. Furthermore, effects on harmful emission due to these parameters are also investigated. Experiments showed that retarded spark ignition timings and increased valve overlap may be helpful to increase exhaust gas temperature. It was also found that $NO_x$ was decreased with increased valve overlap. This study also showed that sudden changes in ISA and amount of fuel due to the deactivation of catalyst heating function cause temporal increase of harmful emissions.