• 제목/요약/키워드: Liquid LPG (Liquefied Petroleum Gas)

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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
    • 한국연소학회:학술대회논문집
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    • 1999.10a
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    • pp.21-26
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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 carburation system was firstly introduced, then the system changed into a gas injection system controlled precisely, but those 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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Various Injection Conditions and Fuel Control of an LPG Liquid Injection Engine (다양한 분사조건과 LPG 액상분사엔진의 연료량 제어)

  • Sim Hansub
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.1
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    • pp.28-35
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    • 2005
  • Fuel injection rate of an injector is affected by various injection conditions such as injection duration, fuel temperature, injection pressure, and voltage in LPG liquid injection systems for either a port-fuel-injection(PFI) or a direct injection(DI) in a cylinder. Even fuel injection conditions are changed, the air-fuel ratio should be accurately controlled to educe exhaust emissions. In this study, correction factor for the fuel injection rate of an injector is derived from the density ratio and the pressure difference ratio. A voltage correction factor is researched from injection test results on an LPG liquid injection engine. A compensation method of the fuel injection rate 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 on experimental range of engine speed and load conditions. And the fuel injection rate is accurately controlled by the proposed compensation method.

Development of Primary Reference Gas Mixtures for Liquid Propane (혼합 액체 프로판 표준가스 개발)

  • Jeong, Yun-sung;Kim, Jin-seog;Bae, Hyun-kil;Kang, Ji-hwan;Lee, Seung-ho;Kim, Yong-doo
    • Journal of the Korean Institute of Gas
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    • v.25 no.4
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    • pp.49-56
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    • 2021
  • Liquefied Petroleum Gas is divided into liquefied gases containing propane (C3H8) and butane (C4H10). The quality of LPG varies greatly depending on the composition of the mixture, so it is important to measure the composition accurately. It is difficult to determine the composition of the mixture because liquid and gas coexist at room temperature. Therefore, the uncertainty in determining the concentration of hydrocarbons by component is high, and there are many problems that differ from the actual content standard. Therefore, it is necessary to develop a mixed liquid propane standard gas for the composition and accurate concentration of hydrocarbon substances. Mixed liquid propane standard gas is manufactured into bellows-type constant-pressure cylinders by ISO-6142 (2015). The homogeneity of the four standard gases manufactured was confirmed to be GC-FID. The manufacturer's uncertainty of expansion was 0.01 % to 0.30 % and homogeneity was 0.03 % to 0.25 %. In this mixed liquid propane standard gas, the relative expansion uncertainty of weight method, manufacturing consistency, cylinder adsorption and long-term stability was developed within 0.26 %-1.3 9% (95% of confidence level, k=2).

Performance of Blowoff Flow for a LPG Fuel Pump with Various Fuel Filters (LPG 펌프에서 필터 종류에 따른 펌프 토출성능에 대한 연구)

  • Lee, Seok-Hwan;Park, Cheol-Woong;Kim, Chang-Up
    • Journal of the Korean Institute of Gas
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    • v.13 no.4
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    • pp.1-7
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    • 2009
  • In recent years, the needs for more fuel-efficient and lower-emission vehicles have driven to use the alternative fuel of LPG(Liquefied Petroleum Gas) which is able to meet the more stringent legislations without many modifications to current engine. LPLi (Liquid Phase LPG Injection) system (the 3rd generation LPG injection system) is the core technology to produce power equivalent to a gasoline engine with less emissions. The LPG fuel pump can supply the compressed LP gas in the liquid phase to engine. The fuel filter is attached in the fuel pump to eliminate the remnants in the liquid phased LP gas and the performance of blowoff flow for a pump can be varied with various filters. In this study, experiments were conducted to investigate the performance and efficiency of the impeller type LPG fuel pump under various filter types of microfiber, double mesh and external filter. And blowoff flow for a LPG fuel pump was measured according to the temperature of the fuel.

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A Study on the Performance Characteristics of a Fuel Pump in LPG Engine (자동차용 LPG 펌프의 성능특성에 관한 연구)

  • Park, Cheol-Woong;Kim, Chang-Up;Choi, Kyo-Nam
    • Journal of the Korean Institute of Gas
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    • v.11 no.4
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    • pp.29-34
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    • 2007
  • In recent years, the need for more fuel-efficient and lower-emission vehicles has driven the technical development of alternative fuels such as LPG(Liquefied Petroleum Gas) which is able to meet the limits of better emission levels without many modifications to current engine design. LPG has a hish vapor pressure and lower viscosity and surface tension than diesel and gasoline fuels. These different fuel characteristics make it difficult to directly apply the conventional gasoline or diesel fuel pump. In this study, experiments are performed to get performance and efficiency of the fuel pump under different condition of the temperature, rotating speeds, and composition of fuel. The characteristics of fuel pump were affected by cavitation occurred from the variation of temperature and composition.

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Characterization of Liquid Phase LPG Sprays within Airflow Fields (LPG 액상분무의 분열 및 혼합특성)

  • 최재준;최동석;남창호;배충식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.5
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    • pp.90-97
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    • 2002
  • The interaction between airflow and liquid phase LfG (Liquefied Petroleum Gas) sprays was investigated in a steady flow system embodied in a wind tunnel to simulate the variety of flow inside intake port of LPG engines with liquid injection system. The spray developments in flowing fields with the mean velocities of 5.4, 21.5 and 42.4m/s were identified by spray visualization techniques such as Mie scattering and shadowgraph. The microscopic visualization using a telescopic lens system was performed to investigate the shape and size of liquid droplets in the spray. PDA measurement was used to get 1-dimensional velocity and diameter of liquid droplets. The fast co-flows make the spray field be compact and be lead upward to the injection direction. SMD of the spray was smaller at the fast flowing field. Spray width got bigger and SMD of the spray was smaller with higher injection pressure.

LPG Spray Behavior Near Injection Nozzle (분사노즐 근처의 LPG 분무거동)

  • Jo, H.C.;Oh, S.W.;Lee, G.H.;Bae, Y.J.;Park, K.H.
    • Journal of ILASS-Korea
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    • v.7 no.2
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    • pp.16-21
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    • 2002
  • Liquefied petroleum gas (LPG) has been used as motor fuel due to its low emissions and low cost. This study addresses the analysis of the LPG spray behavior near injection nozzle. The LPG spray photographs are compared with sprays of diesel fuel at the same conditions. The LPG spray photos show that the dispersion characteristic depends very sensuously on the ambient pressure soon after injection. The spray angle is very wide in a low ambient pressure condition until the saturated pressure at this test condition, but the angle value is quickly reduced at the condition over the pressure.

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A Study on Performance Characteristics According to the Fuel Conditions for a Fuel Pump in LPG Engine (자동차용 LPG 펌프의 연료조건에 따른 성능특성에 관한 연구)

  • Park, Cheol-Woong;Kim, Chang-Up;Choi, Kyo-Nam
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.4
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    • pp.266-274
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    • 2008
  • The need for more fuel-efficient and lower-emission vehicles has driven the technical development of alternative fuels such as Liquefied Petroleum Gas(LPG) which is able to meet the limits of better emission levels without many modifications to current engine design. LPG has a high vapor pressure and lower viscosity and surface tension than diesel and gasoline fuels. These different fuel characteristics make it difficult to apply it for the conventional gasoline or diesel fuel pump directly. In this study, experiments are performed to get performance and efficiency of the fuel pump at different condition as temperature, rotating speeds, composition of fuel. The characteristics of fuel pump is affected by cavitation due to the variation of temperature and composition.

LPG Spray Characteristics in a Multi-hole Injector for Gasoline Direct Injection (분사조건에 따른 가솔린 직접분사용 다공 분사기에서의 LPG 분무특성)

  • Jung, Jinyoung;Oh, Heechang;Bae, Choongsik
    • Journal of ILASS-Korea
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    • v.19 no.1
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    • pp.1-8
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    • 2014
  • Liquefied petroleum gas (LPG) is regarded as an alternative fuel for spark ignition engine due to similar or even higher octane number. In addition, LPG has better fuel characteristics including high vaporization characteristic and low carbon/hydrogen ratio leading to a reduction in carbon dioxide emission. Recently, development of LPG direct injection system started to improve performance of vehicles fuelled with LPG. However, spray characteristics of LPG were not well understood, which is should be known to develop injector for LPG direct injection engines. In this study, effects of operation condition including ambient pressure, temperature, and injection pressure on spray properties of n-butane were evaluated and compared to gasoline in a multi-hole injector. As general characteristics of both fuels, spray penetration becomes smaller with an increase of ambient pressure as well as a reduction in the injection pressure. However, it is found that evaporation of n-butane was faster compared to gasoline under all experimental condition. As a result, spray penetration of n-butane was shorter than that of gasoline. This result was due to higher vapor pressure and lower boiling point of n-butane. On the other hand, spray angle of both fuels do not vary much except under high ambient temperature conditions. Furthermore, spray shape of n-butane spray becomes completely different from that of gasoline at high ambient temperature conditions due to flash boiling of n-butane.

A Study on the Effects of LPDi System Application in 2.0L Hybrid Vehicles Using Energy Flow Analysis (에너지 흐름 분석을 이용한 2.0L 급 하이브리드 차량에서의 LPDi 시스템 적용 효과 연구)

  • Young kuk An;Bonseok Koo;Jinil Park
    • Journal of ILASS-Korea
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    • v.29 no.1
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    • pp.7-15
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    • 2024
  • This study investigates the performance of 2.0L hybrid vehicles equipped with Liquefied Petroleum Gas (LPG) fuel engines, using energy flow analysis. By incorporating a direct LPG injection system (LPDi), the research aims to overcome the reduced maximum output commonly associated with LPG engines. Moreover, the integration of a hybrid system is explored as a means to enhance vehicle fuel economy while reducing CO2 and emissions. The study employs data from FTP-75 and HWFET driving cycle to inform future research efforts focused on predicting CO2 emissions and fuel economy for Hybrid Electric Vehicles utilizing LPG Direct Injection. The findings offer insights into optimizing fuel systems for better environmental and operational performance in hybrid vehicles.