• Title/Summary/Keyword: High Pressure Fuel pipe

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A Study for Preventing Folding Defect of the Common Rail Pipe in Heading Process (커먼레일 파이프 헤딩공정의 접힘결함 방지에 관한 연구)

  • Song, Myung-Jun;Woo, Ta-Kwan;Jung, Sung-Yuen;Hur, Kwan-Do;Kim, Chul
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.1
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    • pp.25-32
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    • 2010
  • With the latest automobile technology, though the third generation common rail system requires high injection pressures up to 1,800bar, the next generation diesel engine is expected to require more higher pressures than the third generation. The common rail pipe requires higher strength because it is one of the parts in the common rail system, which is influenced directly by fuel under high pressure. Preform design is very important for preventing head of the common rail pipe from folding in the heading process. In this study, die angle, curvature, outer diameter of die and length of trapped part are selected as main parameters to obtain best preform shape minimizing radius of folding. Therefore optimal design is carried out by finite element analysis and Taguchi method through main parameters. Results of the finite element analysis have good agreements with those of the experiments in the actual field.

The effect of heat exchanger type for exhaust heat recovery system on diesel engine performance (배기 열 회수 열교환기 형식이 디젤 엔진 성능에 미치는 영향)

  • Kim, Cheol-Jeong;Choi, Byung-Chul;Park, Kweon-Ha
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.6
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    • pp.639-647
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    • 2014
  • Due to global warming and depletion of fossil fuels, technologies reducing $CO_2$ emission and increasing fuel efficiency simultaneously are required. An exhaust gas heat recovery system is a technology to satisfy both issues. This study analyses three types of heat exchanger installed on an exhaust pipe. In case of plate type heat exchanger, back pressure rapidly increased and maximum cylinder pressure reduced in high speed and maximum load, and back pressure increased over twice and specific fuel consumption also increased up to 2% which were the highest increasing rate. In case of fin tube type, the amounts of exhaust emissions and specific fuel consumption rate were less than the other two types. The effect of shell and tube was in the middle. Making a decision by only the effect on engine performance, a fin tube type is the best for exhaust heat recovery systems.

The effect of exit opening rate on exhaust gas pressure, temperature, and engine performance (배기 출구 개도율이 배기 압력과 온도 및 엔진 성능에 미치는 영향)

  • Kim, Cheol-Jeong;Choi, Byung-Chul;Park, Kweon-Ha
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.1
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    • pp.15-22
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    • 2014
  • Multiple devices have been installed to reduce exhaust emissions and to increase thermal efficiency. Those devices reduce the exhaust pipe opening area and increase the exhaust gas pressure. The pressure increase disturbs a gas flow and has a bad effect on the engine performance. However there is some study that NOx can be reduced with exhaust gas pressure increase. In this study an engine performance is tested with various opening ratios. The result shows that the fuel consumption rate is reduced in case of little amount of the pressure increase, and NOx is reduced with the pressure increase, while the concentration of the toxic exhaust gases are increased in the case of high back-pressure.

Particulate Emissions from a Direct Injection Spark-ignition Engine Fuelled with Gasoline and LPG (가솔린 및 LPG 연료를 사용하는 직접분사식 불꽃점화엔진에서 배출되는 극미세입자 배출 특성에 관한 연구)

  • Lee, Seok-Hwan;Oh, Seung-Mook;Kang, Kern-Yong;Cho, Jun-Ho;Cha, Kyoung-Ok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.3
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    • pp.65-72
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    • 2011
  • In this study, the numbers, sizes of particles from a single cylinder direct injection spark-ignition (DISI) engine fuelled with gasoline and LPG are examined over a wide range of engine operating conditions. Tests are conducted with various engine loads (2~10bar of IMEP) and fuel injection pressures (60, 90, and 120 bar) at the engine speed of 1,500 rpm. Particles are sampled directly from the exhaust pipe using rotating disk thermodiluter. The size distributions are measured using a scanning mobility particle sizer (SMPS) and the particle number concentrations are measured using a condensation particle counter (CPC). The results show that maximum brake torque (MBT) timing for LPG fuel is less sensitive to engine load and its combustion stability is also better than that for gasoline fuel. The total particle number concentration for LPG was lower by a factor of 100 compared to the results of gasoline emission due to the good vaporization characteristic of LPG. Test result presents that LPG for direct injection spark ignition engine help the particle emission level to reduce.

Evaluation of structural integrity of the HP vaporizer and pipes of LNG fuel gas supply system (LNG 연료 선박용 FGSS의 고압 기화기와 출입구 배관에 대한 구조 건전성 평가)

  • Kim, Chang-Soo;Yoon, Joo-Hwan;Lee, Chang-Joon;Ha, Man-Young;Cho, Jong-Rae
    • Journal of Advanced Marine Engineering and Technology
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    • v.40 no.9
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    • pp.780-785
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    • 2016
  • Heavy oil used as ship propulsion has a serious issue regarding exhaust emission of global warming. Recently, among large-scale merchant ships are using LNG as green ships so called ech-ships. In this study, an vaporizer and pipes under cryogenic and high pressure load were considered to evaluate structural integrity according to codes. Structural analysis of the vaporizer and pipes was performed using the commercial code, ANSYS. Integrity evaluation of the vaporizer based on von Mises stress was performed in accordance with allowable stress specified in ASME Boiler & Pressure Vesssel Section VIII Division 2. To assess structural integrity of the pipes, stress components were combined and compared with ASME B31.3. The calculated stresses for all load cases are lower than allowable stresses, therefore the structural integrity of equipments are verified.

Optimization of Diesel Engine Performance with Dual Loop EGR considering Boost Pressure, Back Pressure, Start of Injection and Injection Mass (과급압력, 배압, 분사 시기 및 분사량에 따른 복합 방식 배기 재순환 시스템 적용 디젤 엔진의 최적화에 대한 연구)

  • Park, Jung-Soo;Lee, Kyo-Seung;Song, Soon-Ho;Chun, Kwang-Min
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.5
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    • pp.136-144
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    • 2010
  • Exhaust gas recirculation (EGR) is an emission control technology allowing significant NOx emission reduction from light-and heavy duty diesel engines. The future EGR type, dual loop EGR, combining features of high pressure loop EGR and low pressure loop EGR, was developed and optimized by using a commercial engine simulation program, GT-POWER. Some variables were selected to control dual loop EGR system such as VGT (Variable Geometry Turbocharger)performance, especially turbo speed, flap valve opening diameter at the exhaust tail pipe, and EGR valve opening diameter. Applying the dual loop EGR system in the light-duty diesel engine might cause some problems, such as decrease of engine performance and increase of brake specific fuel consumption (BSFC). So proper EGR rate (or mass flow) control would be needed because there are trade-offs of two types of the EGR (HPL and LPL) features. In this study, a diesel engine under dual loop EGR system was optimized by using design of experiment (DoE). Some dominant variables were determined which had effects on torque, BSFC, NOx, and EGR rate. As a result, optimization was performed to compensate the torque and BSFC by controlling start of injection (SOI), injection mass and EGR valves, etc.

Modification of an LPG Engine Generator for Biomass Syngas Application (바이오매스 합성가스 적용을 위한 LPG 엔진발전기 개조 및 성능평가)

  • Eliezel, Habineza;Hong, Seong Gu
    • Journal of The Korean Society of Agricultural Engineers
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    • v.64 no.5
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    • pp.9-16
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    • 2022
  • Syngas, also known as synthesis gas, synthetic gas, or producer gas, is a combustible gas mixture generated when organic material (biomass) is heated in a gasifier with a limited airflow at a high temperature and elevated pressure. The present research was aimed at modifying the existing LPG engine generator for fully operated syngas. During this study, the designed gasifier-powered woodchip biomass was used for syngas production to generate power. A 6.0 kW LPG engine generator was modified and tested for operation on syngas. In the experiments, syngas and LPG fuels were tested as test fuels. For syngas production, 3 kg of dry woodchips were fed and burnt into the designed downdraft gasifier. The gasifier was connected to a blower coupled with a slider to help the air supply and control the ignition. The convection cooling system was connected to the syngas flow pipe for cooling the hot produce gas and filtering the impurities. For engine modification, a customized T-shaped flexible air/fuel mixture control device was designed for adjusting the correct stoichiometric air-fuel ratio ranging between 1:1.1 and 1.3 to match the combustion needs of the engine. The composition of produced syngas was analyzed using a gas analyzer and its composition was; 13~15 %, 10.2~13 %, 4.1~4.5 %, and 11.9~14.6 % for CO, H2, CH4, and CO2 respectively with a heating value range of 4.12~5.01 MJ/Nm3. The maximum peak power output generated from syngas and LPG was recorded using a clamp-on power meter and found to be 3,689 watts and 5,001 watts, respectively. The results found from the experiment show that the LPG engine generator operated on syngas can be adopted with a de-ration rate of 73.78 % compared to its regular operating fuel.

Study on Anti-oxidization Coating for Staged Combustion Cycle Rocket Engine (다단연소 사이클 엔진 적용을 위한 내산화 코팅에 관한 연구)

  • Kim, Young-June;Byon, Eung-Sun;Rhee, Byong-ho;Han, Yeoung-Min;Noh, Yong-Oh;Bae, Byung-Hyun;Hyun, Seong-Yoon;Cho, Hwang-Rae;Bang, Jeong-Suk
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.864-870
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    • 2017
  • The propellants are burned in the pre-burner of the staged combustion cycle engine, and the resulting hot gas drives the turbine, and the turbine operates the turbo pump. The burned gas passing through the turbo pump is supplied to the combustor at high temperature and high pressure, where the gas is supplied in an excess of fuel or an excess of oxidant depending on the amount of fuel or oxidant. When the cycle works at oxidizer-rich staged combustion, its metal pipe can ignite or explode by the impact of even small particles. In this study, we develop the powder combinations for anti-oxidation coating through the analysis of other coating materials and establish the coating process.

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