• Title/Summary/Keyword: Liquid LPG (Liquefied Petroleum Gas)

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Top-Feed Type Port Fuel Injector for Liquefied Petroleum Gas Liquid Phase Injection (Top-Feed Type 인젝터의 액상분사 LPG연료 분사장치 적용)

  • Yeom, Ki-Tae;Park, Jung-Seo;Bae, Choong-Sik;Park, Jeong-Nam;Kim, Sung-Kun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.6
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    • pp.30-37
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    • 2007
  • The injection and spray characteristics of top-feed type injector was investigated under liquid phase injection fueled with liquefied petroleum gas (LPG). Different pressures and temperatures of fuel injection system were tested to identify the injection characteristics after hot soaking. MIE-scattering technique was used for verification of successful liquid phase injection after hot soaking. In case of bottom-feed type injector, the injection was accomplished at every experimental condition. In case of top-feed type injector, when the pressure of LPG was over 1.2 MPa, the injection was not executed. However, under the pressure were 1.2 MPa, the liquid phase injection after hot soaking was accomplished. The engine with top-feed type fuel injection equipment was restarted successfully after hot soaking.

Performance and Emissions Characteristics of a Converted Liquefied Petroleum Gas (LPG) Engine with Mixer and Liquid Propane Injection (LPi) System

  • Choi, Gyeung-Ho;Kim, Jin-Ho;Cho, Ung-Lae;Chung, Yon-Jong;Han, Sung-Bin
    • Journal of Energy Engineering
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    • v.14 no.3 s.43
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    • pp.187-193
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    • 2005
  • In this study, the performance and emission characteristics of a liquefied petroleum gas (LPG) engine converted from a diesel engine were examined by using mixer system and liquid propane injection (LPi) system. A compression ratio of 21 for the base diesel engine, was modified to 8, 8.5, 9 and 9.5. The engine performance and emissions characteristics are analyzed by investigating engine power, brake mean effective pressure (BMEP), brake specific fuel consumption (BSFC), volumetric efficienry, CO, THC and NOx. Experimental results showed that the LPi system generated higher power and lower emissions than the conventional mixer fuel supply method.

BEHAVIOR OF LIQUID LPG SPRAY INJECTING FROM A SINGLE HOLE NOZZLE

  • PARK K.
    • International Journal of Automotive Technology
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    • v.6 no.3
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    • pp.215-219
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    • 2005
  • Liquefied petroleum gas (LPG) has been used as motor fuel due to its low emissions and low cost. A liquid direct injection system into a cylinder was suggested as a next generation system to maximize a fuel economy as well as a power. This study addresses the analysis of the LPG spray injecting from single hole injector. Two different test conditions are given, which are a fully developed spray case with various injection pressures and a developing spray case with ambient pressure variation. The LPG spray photographs are compared with the sprays of gasoline and diesel fuel at the same conditions, and the spray angles and penetration lengths are also compared, and then the spray behavior is analyzed. The LPG spray photos show that the dispersion characteristic depends very sensitively on the ambient pressure soon after injection. The spray angle is very wide in a low ambient pressure condition until the saturated pressure, but the angle is quickly reduced at the condition over the pressure. However, the down stream of the LPG spray shows much wider dispersion and less penetration than those of gasoline and diesel sprays regardless ambient pressure condition.

Discussions on the Leak Phenomena of Liquid Butane in the Open Air (액화석유가스(butane)의 대기중 누출현상에 대한 고찰)

  • Yoon, Jae-Kun
    • Journal of the Korean Society of Safety
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    • v.15 no.2
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    • pp.59-62
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    • 2000
  • Almost accidents related with gas have started with the leakage of LPG(Liquefied Petroleum Gas) in the open air. But experimental data of LPG leak jet are difficult to find because the safety of experiment is hard to secure and its phenomenon is not steady but transitional. This study is focused on the phenomena of injection jet of liquid butane to the open air. Simple experiment shows that only liquid butane jet in the open air is possible due to the slow vaporization because of low temperature difference between the liquid and air and low vapor pressure of liquid butane. Comparing with the water, 25~40% more liquid butane flow through the tube under the same pressure difference driving.

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Prediction of Fuel Properties on LPLi System with an External Fuel Pump (외장형 연료펌프를 사용한 LPLi시스템에서 연료의 상태량 변화 예측)

  • Kim, Jae-Hyung;Yoon, Yu-Bin;Park, Young-Joon;Song, Chun-Sub;Lee, Seang-Woak;Cho, Yong-Seok
    • Journal of ILASS-Korea
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    • v.15 no.1
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    • pp.38-43
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    • 2010
  • The LPG(Liquefied Petroleum Gas) fuel attracts attention as a clean alternative fuel. In order to further reduce the exhaust emission and improve performance in LPG engines, the LPLi(Liquid Phase LPG Injection) system is used. In LPLi system, the fuel pump performance is important for keeping the LPG over it's saturated vapor pressure. An external fuel pump is needed to improve the durability for LPG engines. This paper predicted the variation of fuel properties on the LPLi system with an external fuel pump. From each component's thermodynamic model, an 1-D simulation is developed for LPLi system with an external fuel pump. Then the 1-D simulation data analyzed and compared with the rig-test. The 1-D simulation and the rig-test produced similar results.

A Fundamental Study of Air-Fuel Ratio Control on LPG Liquid Injection Engines (LPG 액체분사엔진의 공연비제어에 관한 기초 연구)

  • Sim, Han-Seop;Sunwoo, Myoungho;Song, Chang-Seop
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.7
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    • pp.80-87
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    • 2002
  • Liquefied petroleum gas (LPG) is used in spark ignition (SI) engines. Fuel injection rate of an injector is affected by fuel temperature and pressure in LPG liquid injection systems for either a multi-point-injection (MPI) or a direct injection (DI) engine. Even fuel injection conditions are varied, the air-fuel ratio should be accurately controlled to reduce exhaust emissions. In this study, a correction factor fur the fuel injection rate of an injector is derived from density ratio and pressure difference ratio. A compensation method of injected fuel amount is proposed for a fuel injection control system. The experimental results for the LPG liquid injection system in a SI engine show that this system works well fur a full range of engine speed and load condition, and the air-fuel ratio is accurately controlled by the proposed correction factor.

Availability Analysis of Safety Devices installed for Preventing Accidental Event in the LPG Refuelling Station (LPG충전소 안전장치의 사고방지 효과에 대한 정량적 분석)

  • Lee Jin-Han;Yu Kwang-Soo;Park Kyo-Shik
    • Journal of the Korean Institute of Gas
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    • v.10 no.1 s.30
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    • pp.26-31
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    • 2006
  • For the purpose of evaluating the availability of manifold safety devices installed in the LPG(Liquefied Petroleum Gas) refuelling stations, the quantitative analysis of the frequency on BLEVE(Boiling Liquid Expanding Vapor Explosion) scenario was performed. The amount of frequency reduction was the way of assessing safety devices availability. In this analysis, we could find out what sorts of safety devices are essential to satisfy acceptable social risk criteria and are prioritized to install in the future.

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Feasibility Test of LPG Vehicles by Using DME-LPG Blends (DME-LPG 혼합연료를 사용한 LPG 차량의 실증평가)

  • Youn, Jumin;Lee, Minho;Park, Cheonkyu;Hwang, Inha;Ha, Jonghan;Kang, Yong
    • Journal of Energy Engineering
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    • v.24 no.4
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    • pp.33-41
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    • 2015
  • Dimethyl ether (DME) can be used as a clean diesel alternative fuel due to the high cetane number and low emission, it can also be applied to automotive fuel as a blended liquefied petroleum gas (LPG) because physical properties are similar to those of LPG. In this study, feasibility test of LPG vehicle using blended DME-LPG fuel was investigated. Three types of fuel supply such as LPLi (Liquid phase LPG injection), LPGi (Liquid phase gas injection) and mixer type were selected to consider the LPG fuel-injection system. The performance characteristics of LPG vehicle were examined by using LPG and blended DME-LPG fuel in order to compare the exhaust emissions (CO, THC, $NO_X$) and fuel economy. The emissions and fuel economy of DME-LPG blend fuel were comparable to those of LPG with increasing driving distance.

Engine Performance and Emissions Characteristics in an LPG Engine Converted with Mixer and LPi System Fuel Supply Methods (개조된 LPG엔진에서 Mixer와 LPi 연료공급방식의 엔진성능 및 배기특성)

  • Choi, Gyeung-Ho;Kim, Jin-Ho;Cho, Ung-Lae;Han, Sung-Bin
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.9
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    • pp.1075-1080
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    • 2004
  • In this study, performance and emissions characteristics of an liquefied petroleum gas (LPG) engine converted from a diesel engine were examined by using mixer system and liquid propane injection (LPi) system fuel supply methods. A compression ratio for the base diesel engine, 21, was modified into 8, 8.5, 9 and 9.5. The cylinder head and the piston crown were modified to roe the LPG in the engine. Ignition timing was controlled to be at minimum spark advance for best torque (MBT) each case. Engine performance and emissions characteristics are analyzed by investigating engine power, brake mean effective pressure (BMEP), brake specific fuel consumption (BSFC), volumetric efficiency, CO, THC and NOx. Experimental results showed that the LPi system generates higher power and lower emissions than the conventional mixer fuel supply method.

Liquid LPG Spray Characteristics With Injection Pressure Variation -Comparison with Diesel Spray- (분사압력변화에 따른 액체 LPG 분무특성 -디젤분무와의 비교-)

  • Lim, Hee-Sung;Park, Kweon-Ha
    • Journal of the Korean Society of Combustion
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    • v.4 no.2
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    • pp.43-50
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    • 1999
  • Liquefied petroleum gas (LPG) has been used as motor fuel due to its low emissions and low cost. The fuel feeding system has been improved with stringent requirement for exhaust emissions. LPG carburetion system was first introduced, then the system has been changed to a precisely controlled gas injection system, but this gas feeding system has a limitation on improving power output. In order to improve an engine performance, a multi-point port injection system was introduced recently, and a liquid direct injection system into a cylinder was suggested as a next generation system to maximize a fuel economy as well as a power. This study addresses the analysis of the LPG spray from diesel injectors. The spray images are visualized and compared with diesel sprays in a wide injection pressure range. The photographs show much wider dispersion of LPG sprays.

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