• 한국가스학회지
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• 제13권4호
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• pp.1-7
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• 2009

최근 연료경제성 및 강화되는 배출가스 규제를 만족하기 위하여 대체연료의 하나인 LPG에 대한 수요가 증가하고 있다. 현재 LPG 차량에 적용되고 있는 제3세대 LPG 연료공급방식인 LPLi(Liquid Phase LPG Injection) 시스템은 가솔린 차량과 비교하여 배출가스는 적게 배출하면서 동등한 출력을 낼 수 있게 하는 핵심 기술이다. LPG 연료를 고압의 액상 상태로 공급하기 위해서는 LPG 펌프가 필요하다. 연료펌프의 성능을 저하 시킬 수 있는 연료 내 불순물을 제거하기 위하여 연료펌프에는 연료필터가 장착되어 있으며 장착되는 연료필터의 종류에 따라서 연료펌프의 성능도 변하게 된다. 본 연구에서는 임펠라 방식을 채택한 LPG 연료펌프에서 극세사, 이중메쉬, 외장형 필터의 세 가지 필터에서 부하별 토출성능 및 효율을 파악하였으며 온도 변화에 따른 펌프유량 변화를 측정하였다.

• 한국항공우주학회지
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• 제35권12호
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• pp.1143-1150
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• 2007

스마트무인기 연료공급시스템에 사용되는 제트펌프의 연료탱크 사이의 연료이송 특성이 실험적으로 조사되었다. 제트펌프의 작동조건은 비행체의 임무에 따른 엔진의 요구사항을 만족하도록 설정되었으며, 주어진 조건에서 제트펌프의 성능을 평가하였다. 제트펌프의 유량비 변화에 따른 압력비 및 효율이 측정되었으며 면적비 변화 등이 고려되었다. 평가 결과로부터 제트펌프는 주어진 압력비보다 큰 범위에서 작동목표인 유량비 2.23을 만족하였다. 효율보다 연료공급량이 중시되는 연료이송 제트펌프의 경우 면적비 변화를 통하여 허용 압력비 범위 내에서 유량비 조절이 가능함을 알 수 있었다.

• 대한기계학회논문집B
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• 제32권2호
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• pp.107-116
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• 2008

The jet pumps are widely used to transfer the fuel between the tanks in an aircraft fuel supply system. However detailed design procedures for determining the size of components of the jet pumps are not known so well. In this paper, the flow characteristics of the jet pump, which is applied in the fuel transfer system for the smart UAV (Unmanned Aerial Vehicle), were experimentally investigated using the acrylic jet pump model for the visualization of the internal flow. The pressure distributions within the jet pump were measured, and then the loss coefficients of each part were calculated. The effects of Reynolds number and the distances (S) between the exit of the primary nozzle and the mixing chamber entrance were investigated. In addition, cavitation phenomena were considered through the flow visualization inside the jet pump. As a conclusion from the experiment, the contraction shape of the primary nozzle has a strong effect on the loss coefficient of the nozzle and the cavitation occurrence. Cavitation starts around the nozzle exit, and then it propagates to the full flow fields of the jet pump.

• 한국자기학회지
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• 제20권6호
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• pp.234-238
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• 2010

캠샤프트의 구동력을 활용한 기계식 연료펌프 시스템을 대체할 솔레노이드 격막 연료펌프는 최근 각광받고 있는 고효율 그린카 부품 중 하나이다. 하지만 솔레노이드 격막 연료펌프의 경우 왕복운동에 필요한 자속을 오직 솔레노이드에 의존하므로 전력소비가 비교적 큰 단점이 있다. 따라서 본 연구에서는 전력소모를 최소화 하기 위하여 영구자석형 VCA 연료펌프 시스템을 제안한다. 또한 상용전자기해석소프트웨어인 MAXWELL을 활용하여 유한요소 해석을 통해 기존의 솔레노이드 격막 펌프와의 전력소모 및 동적 성능을 비교 분석한다.

• 한국분무공학회지
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• 제9권2호
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• pp.18-23
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• 2004

An experimental studies of conventional gasoline fuel pump were carried out to obtain fundamental data fur liquid phase LPG injection(LPLi) system. A regenerative type and a roller-vane type of pumps were investigated in various operational condition. The experiments were performed to obtain flow rate of LPG fuel as a function of pressure differences and temperatures. The regenerative pump had too low flow rate at some experimental conditions to use this pump system for LPLi fuel supply system. On the other hand, the roller-vane type pump can be applied to the system only if its check valve is modified. Cavitation might occur in this system which can result in system noise, flow rate variation, and pump durability problem. To solve these problems the system is needed to increase $NPSH_{re}$(required net positive suction head).

• 한국수소및신에너지학회논문집
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• 제28권3호
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• pp.308-314
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• 2017

Jet pump in automotive fuel tank module is used to deliver fuel to fuel pump so that the pump is operated without aeration in suction side. In this study, three dimensional simulation model of jet pump is developed to understand performance variation over design parameters. Performance of jet pump is also investigated experimentally in terms of operating pressures. The experimental data is used to verify the three dimensional simulation model of jet pump. Verification results show that the three dimensional simulation model of jet pump is about 1% error with experiment. The simulations are conducted in terms of throat ratio and primary flow induction angle. As the throat ratio is increased, the flux ratio is trade-off at 3 times of throat diameter. On the other hand, as primary flow induction angle is increased, vapor pressure inside the nozzle is decreased. In summary, the results show that liquid jet pump has to be optimized over design parameters. Additionally, high velocity of induced flow is able to evolve cavitation phenomena inside the jet pump.

• 한국수소및신에너지학회논문집
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• 제32권5호
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• pp.324-330
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• 2021

In recent years, polymer electrolyte membrane fuel cell (PEMFC) based cogeneration system has received more and more attention from energy researchers because beside electricity, the system also meets the residential thermal demand. However, the low-quality heat exited from PEMFC should be increased temperature before direct use or storage. This study proposes a method to utilize the heat exhausted from a 10 kW PEMFC by coupling a heat pump. Two different configuration using heat pump and a reference layout with heater are analyzed in term of thermal and total efficiency. The system coefficient of performance (COP) increases from 0.87 in layout with heaters to 1.26 and 1.29 in configuration with heat pump and cascade heat pump, respectively. Lastly, based on system performance result, another study in economics point of view is proposed.

• 항공우주시스템공학회지
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• 제14권1호
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• pp.1-7
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• 2020

본 논문은 국내 최초로 독자기술로 개발된 항공기용 연료이송펌프의 기어부를 설계하는 일련의 절차 및 그 결과에 대한 것이다, 기어펌프 방식이 베인펌프 방식에 비하여 전반적 성능이 우월하고, 내부 누설이 소량으로, 연료이송펌프의 설계에 필요사항에 부합하여 이 방식이 선정되었다. 기어 하우징은 흐름을 결정하는 중요한 변수인데, 기어의 외경을 고려하여 적절한 여유공간을 갖도록 설계하였다. 아울러, 모터가 연료이송펌프를 구동하기 위해 필요한 공압 및 축동력 등도 계산하였다.

• 설비공학논문집
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• 제21권6호
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• pp.355-366
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• 2009

In the present study, fuel cell driven ground source heat pump system is applied to a large community building and performance of the heat pump system is computationally analyzed. Conduction heat transfer between brine pipe and ground is analyzed by TEACH code to predict the performance of heat pump system. Predicted COP of the heat pump system and the energy cost were compared with variation of the location of the objective building the water saturation rate of soil and the driven powers of heat pump system. Significant reduction of energy cost can be accomplished by employing the fuel cell driven heat pump system in comparison with the late-night electricity driven system. It is due to the low electricity production cost of fuel cell system and the application of recovered waste heat generated during electricity production process to the heating of large community building.

• 한국분무공학회지
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• 제16권1호
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• pp.1-6
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• 2011

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 high 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. Self acting lubricated groove design or coating can be used in high-speed and high precision spindle system like a roller-vane type fuel pump, because of its advantages such as low frictional loss, low heat generation, averaging effect leading better running accuracy and simplicity in manufacturing. Those design method can also affect the atomization of fuel from the injector and the formation of fuel film on the intake manifold. In this study, experiments are carried out to get performance characteristics of initial and steady state operation, The characteristics of vane type fuel pump were investigated to access the applicability on LPLi engine.