• Title, Summary, Keyword: 급속흡입압축팽창기

Search Result 5, Processing Time 0.028 seconds

A High Expansion Effects of Atkinson Cycle by adopting Variable Intake Valve Closing Timing with Compensated Intake Air-mass and Effective Compression Ratio. (흡입공기량 및 유호압축비 보상시 흡입밸브닫힘시기 변화에 의한 고팽창효과)

  • Jeong, Yang-Joo;Kim, Yun-Young;Lee, Jong-Tai
    • Proceedings of the KSME Conference
    • /
    • /
    • pp.1698-1703
    • /
    • 2004
  • To understand the high expansion effects by adopting intake closing time in the cases of compensating intake air-mass and effective compression ratio simultaneously, fundamental study was carried out by using RICEM realizing Atkinson cycle. Intake air-mass and effective compression ratio were compensated by increasing supercharged pressure and geometric compression ratio. The results showed that the increasing rates of expansion ratio and expansion-compression ratio were increased by compensating both a intake air-mass and effective compression ratio the same tendencies were obtained with the increases of compression ratio and cut off ratio It was also found that LIVC has more advantages in expansion ratio and effective work than those of EIVC under above conditions.

  • PDF

Analysis on the Characteristics of RICEM for Researching Combustion Characteristics of Linear Hydrogen Power System (리니어 수소동력시스템의 연소연구용 급속흡입압축기의 특성 해석)

  • Lee, J.H.;Kim, K.M.;Jeong, D.Y.;Lee, Jong-T.
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.16 no.1
    • /
    • pp.66-73
    • /
    • 2005
  • Hydrogen linear power system is estimated as the next generation power system which can obtain a performance as same as fuel cell. In order to develop Hydrogen combustion power system with high thermal efficiency, it is very important to understand the basic characteristics of hydrogen combustion and establish combustion stabilization technique of its system. In this study, RICEM(Rapid Intake Compression Expansion Machine) for researching of hydrogen combustion linear power system was manufactured and evaluated, and the basic characteristics of linear RICEM were analyzed.

The Fundamental Study on Generation of High Turbulence at Vicinity of Ignition Timing (점화시기 근방의 고난류 생성을 위한 기초연구)

  • Hong, Jae-Ung;Song, Yeong-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.20 no.1
    • /
    • pp.275-283
    • /
    • 1996
  • The turbulence in the engine cylinder is generated by intake pressure and inertia effects during intake stroke, and is generated and decreased by piston compression effect during the compression stroke. The classified needed to generate high turbulence flow at vicinity of ignition timing. Therefore, A single-shot Rapid Intake Compression Expansion Machine (RICEM), which is able to realize the intake, compression, expansion or intake-compression stroke under high piston speed respectively, was manufactured and evaluated in order to find methods to generate high turbulence at around spark timing. It was found that the characteristics of RICEM such as reapperance, leakage, piston displacement with crank angle was corresponding to those of real engine and RICEM simulates not only high temperature and high pressure field but also flow patterns of the actual engine by increasing of pressure in intake line.

A Study on the Combustion Stabilization and Performance Improvement in the Free-piston Hydrogen Fueled Engine (프리피스톤 수소기관의 연소안정화 및 성능향상에 관한 연구)

  • Noh, K.C.;Yoon, J.S.;Kim, K.M.;Park, S.W.;Lee, J.T.
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.17 no.2
    • /
    • pp.227-233
    • /
    • 2006
  • A free-piston hydrogen fueled engine is considered as one of the next power systems which is able to obtain high efficiency and low emission, simultaneously. In this study, in order to ensure the possibility as the next generation power system, the combustion characteristics and the performance of the free-piston hydrogen fueled engine are analyzed by using the linear RICEM for the change of injection pressure and equivalence ratio. As the results, in-cylinder maximum pressure is shown at injection pressure $P_{inj}$=6bar. Backfire phenomenon is not observed under experimental condition and knock occurs over ${\Phi}=0.8$. The thermal efficiency is the highest at injection pressure, $P_{inj}$=6bar and equivalence ratio, ${\Phi}=0.7$, respectively.

A Study on the Backfire and Abnormal Combustion in the Free-piston Hydrogen Fueled Engine (프리피스톤 수소기관의 역화 및 이상연소에 관한 연구)

  • Kim, K.M.;Park, S.W.;Lee, J.H.;Noh, K.C.;Lee, J.T.;Lee, Y.K.
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.17 no.1
    • /
    • pp.1-7
    • /
    • 2006
  • The free-piston hydrogen fueled engine is estimated as the next generation power system which can obtain high efficiency and low emission, simultaneously. In order to develop the free-piston hydrogen fueled engine, it is necessary to stable the combustion. The engine combustion, backfire and knock phenomenons were studied by using RICEM for researching combustion characteristics of free-piston engine. As the results, backfire occurrence was not observed in the free-piston engine under limited experimental condition. And knocking occurred in case of higher cylinder wall temperature.