• Title/Summary/Keyword: Glow plug

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EFFECT OF DI-TERTIARY-BUTYL PEROXIDE ON IGNITION PERFORMANCE IN A COMPRESSION IGNITION NATURAL GAS ENGINE

  • Li, F.C.;Zheng, Q.P.;Zhang, H.M.
    • International Journal of Automotive Technology
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    • v.8 no.4
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    • pp.413-419
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    • 2007
  • Experimental study of additives on the ignition performance of a compression ignition natural gas engine is introduced, followed by results of a simulation of its working mechanism. From the experimental results, it is understood that engine ignition performance can be improved when a certain amount of Di-tertiary-butyl peroxide additive is added. If the mass fraction of Di-tertiary-butyl peroxide additive reaches as high as 14.2%, engine ignition can be realized at ambient temperatures with a glow plug temperature of about $750^{\circ}C$. From the simulation results, we verify that the Di-tertiary-butyl peroxide additive, by cracking its radicals at lower temperature, can accelerate reaction rate. Therefore, the additive is able to improve the ignition performance of natural gas significantly.

A Study on Performance Simulation of an Reciprocating Engine for Small Long Endurance Unmanned Aerial Vehicles (소형 장기체공 무인기용 왕복엔진 성능 예측 시뮬레이션 연구)

  • Chang Sung-Ho;Koo Sam-Ok;Shin Younggy
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.29 no.7 s.238
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    • pp.820-827
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    • 2005
  • Development of an engine with good fuel economy is very important for successful implementation of long endurance miniature UAVs (unmanned aerial vehicles). In the study, a 4-stroke glow-plug engine was modified to a gasoline-fueled spark-ignition engine. Engine tests measuring performance and friction losses were conducted to tune a simulation program for performance prediction. It has been found that excessive friction losses are caused by insufficient lubrication at high speeds. The simulation program predicts that engine power and fuel economy get worse with high altitude due to increasing portion of friction losses. The simulation results suggest quantitative guidelines for further development of a practical engine.

Analysis of Impingement Lands to Help Diesel Combustion Chamber Using Spray Impaction (분무충돌을 이용하는 디젤연소실 설계를 위한 충돌면 분석)

  • Park, K.
    • Journal of ILASS-Korea
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    • v.1 no.2
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    • pp.24-32
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    • 1996
  • Most of the research of small engines to date focused on developing spark ignition engines occupied much parts. Recently the number of a small direct injection diesel engine applied in small cars has been increased and considered as a next generation power source for passenger cars because of its high efficiency. Therefore the combustion chamber becomes smaller and the fuel injection pressure goes higher, which makes fuel sprays impinged easily on the combustion chamber walls. When strong swirls are not induced, the fuel may not mix with air because of fuel deposition on the wall. As a positive way, the combustion chamber systems which is using spray wall impaction has been introduced and assessed by an experimental or a simulate manner. In these systems the raised lands are positioned in tile chamber for spray impaction in order to break up the fuel drops into much smaller and direct them into desirable direction. This study addresses to the effects of rho position and size of the raised land or glow plug to help the chamber design using spray wall impaction. The characteristics of the spray impinged on various lands are investigated and compared with each other. Then the chamber shapes are discussed with the characteristics and their proper position and size is proposed in any chamber volume.

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Start-up and operation of Gasoline Fuel Processor for Isolated Fuel Cell System (독립형 연료전지 시스템을 위한 가솔린 연료프로세스의 시동 및 운전)

  • Ji, Hyunjin;Bae, Joongmyeon
    • Journal of Energy Engineering
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    • v.25 no.1
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    • pp.76-85
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    • 2016
  • This study introduces the system layout and control strategy necessary to start and operate a fuel processor in a wide range of temperatures where a gasoline was selected as the fuel of fuel processor considering logistic support of Korea Army. The autothermal reformig(ATR) catalyst is heated to light-off temperature by combustion method in the initial stage. In order to ignite the gasoline and air mixture stably, the glow plug is installed after ATR catalyst. When the catalyst is increased to light-off temperature, the reformer is operated from initiation to steady state conditions as follows: Partial oxidation(POX) mode, partial ATR mode, full ATR mode. Finally the start-up and control strategy is validated by the operational test of gasoline fuel processor at low and room temperature. As a result the gasoline fuel processor is able to start-up within 40 min and to produce the reformate gas which has 37 ~ 42 vol.%(dry basis) of $H_2$ and 0.3 vol.% of CO.

A Study on Ammonia Partial Oxidation over Ru Catalyst (Ru 촉매에서의 암모니아 부분산화에 대한 연구)

  • SANGHO LEE;HYEONGJUN JANG;CHEOLWOONG PARK;SECHUL OH;SUNYOUP LEE;YONGRAE KIM
    • Transactions of the Korean hydrogen and new energy society
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    • v.33 no.6
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    • pp.786-794
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    • 2022
  • Green ammonia is a promising renewable energy carrier. Green ammonia can be used in various energy conversion devices (e.g., engine, fuel cell, etc.). Ammonia has to be fed with hydrogen for start-up and failure protection of some energy conversion devices. Ammonia can be converted into hydrogen by decomposition and partial oxidation. Especially, partial oxidation has the advantages of fast start-up, thermally self-sustaining operation and compact size. In this paper, thermodynamics, start-up and operation characteristics of ammonia partial oxidation were investigated. O2/NH3 ratio, ammonia flow rate and catalyst volume were varied as operation parameters. In thermodynamic analysis, ammonia conversion was maximized in the O2/NH3 range from 0.10 to 0.15. Ammonia partial oxidation reactor was successfully started using 12 V glow plug. At 0.13 of O2/HN3 ratio and 10 LPM of ammonia flow rate, ammonia partial oxidation reactor showed 90% of ammonia conversion over commercial Ru catalyst. In addition, Increasing O2/NH3 ratio from 0.10 to 0.13 was more effective for high ammonia conversion than increasing catalyst volume at 0.10 of O2/NH3.