• 제목/요약/키워드: chamber method

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스파크 점화기관의 연소실 형상에 따른 공진현상 해석에 관한 연구 (A Study on the Presure Resonance with Combustion Chamber Geometry for a Spark Ignition Engine)

  • 박경석;장석형
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집D
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    • pp.890-895
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    • 2001
  • Pressure resonance frequency that is caused in the combustion chamber can be interpreted to acoustic analysis. Until now the pressure resonance has been assumed and calculated to a disc type combustion chamber that neglected the combustion chamber height because the knock occurs near the TDC(top dead center). In this research FEM(fine element method) has been used to calculate the pressure resonance frequency inside the experimental engine combustion. The reduce error of the resonance frequency obtained by FEM has decreased about 50% compared to the calculation of Draper's equation. Due to the asymmetry in the shape of the combustion chamber that was neglected in Draper's equation we could find out that a new resonance frequency could be generated. To make the experimental results equal we could know that the speed of sound that satisfies Draper's equation was selected 13% higher than all the pent-roof type combustion considered.

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연소실 초기온도 변화에 따른 순간열유속에 관한 연구 (A Study of Hear Flux and Instantaneous Temperature According to the Initial Tamperature of Combustion Chamber in a Constant Volume Combustion Chamber)

  • 이치우
    • 한국산업융합학회 논문집
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    • 제6권3호
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    • pp.193-200
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    • 2003
  • In the production of internal combustion engines, there has been a move towards the development of high performance engines with improved fuel efficiency, lighter weight and smaller sizes. These trends help to answer problems in engines related to thermal load and abnormal combustion. In order to investigate these problems, a thin film-type probe for instantaneously measuring temperatures has been suggested. A method for manufacturing such a probe was established in this study. The instantaneous surface temperature of a constant volume combustion chamber was measured by this probe and the heat flux was obtained through Fourier analysis. In order to thoroughly understand the characteristics of combustion, the authors measured the wall temperature of the combustion chamber and computed heat flux through a cylinder wall while varying the protrusion height of the probe. For achieving the above goals, a instantaneous temperature probe was developed, thereby making possible the analysis of the instantaneous temperature of wall surface and the detection of unsteady heat flux in the constant volume combustion chamber.

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동력로용 보상형 전리함의 제작 및 실험 (Manufacture and Experiment of Compensated Ionization Chamber for the Nuclear Power Reactor)

  • 육종철;고병준;박용집
    • 전기의세계
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    • 제19권4호
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    • pp.18-23
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    • 1970
  • A neutron detector, in general, can not be utilized as the thermal neutron detecting chamber in the nuclear power reactor, especially P.W.R. due to the characteristics of high temperature, high pressure and high neutron flux in a reactor vessel. We have performed an experiment to detect the thermal neutrons at 400.deg. C and high flux of thermal neutron in a power reactor. Coating boron-10 on the aluminium plates by means of surface diffusion method at 600.deg. C for 5 hours in an electric furace, also we made a typical chamber which was compensated ionization chamber filled with free air as an ionization gas. It was checked the chamber characteristics in the TRIGA MARK-II Reactor at the power level from zero to 250KW. The chamber current showed a perfect linear increase to power increase. However, many variation of the measured current were observed within the power of 50KW.

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메타놀의 희박연소를 위한 혼합기의 성층화와 연소특성에 관한 연구(제 I장 : IDI형 정적연소기에서의 혼합기 연소특성) (A Study on the Combustion Characteristics and Stratification for Lean Burn of Methanol (The Combust ion Character istics in a IDI Type Constant Volume Combustion Chamber))

  • 박춘근;윤수한
    • Journal of Advanced Marine Engineering and Technology
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    • 제21권3호
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    • pp.302-310
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    • 1997
  • In this paper, we find a method to improve ignitability using methanol which is prospective as an alternative fuel. The constant volume combuster is divided into main chamber and sub-cham¬ber. These two chambers are linked by an adapter which is shaped like a cup. We also compare CDI to HIS that is revised in our laboratory for making a scrutiny into the effects of ignition char¬acteristics. Besides, we analyze a flame propagation process in the main and sub-chamber through taking pictures 10, 000 frames per second by high speed camera at the state being fabricated quartz glass aside main and sub-chamber.

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보조용기의 열전달특성이 공기스프링의 성능에 미치는 영향 (Effectiveness of a Heat Transfer Characteristics of an Auxiliary Chamber for Performance of an Air Spring)

  • 장지성
    • 동력기계공학회지
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    • 제17권2호
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    • pp.121-127
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    • 2013
  • The air spring is used widely because of the easy change of spring constant, and, a superior vibration and shock insulation performance. Among the apparatus using the merits of that, the air spring connected an auxiliary chamber has been developed and used as a component of suspension system for an automobile and a railroad car. The purpose of this study is to suggest a design method reflecting heat transfer effect for an air spring system connected auxiliary chamber. In order to do so, this study investigates change of reaction force along with variations in heat transfer coefficient, and, analyzes an effectiveness of a heat transfer characteristics of an auxiliary chamber for external force attenuation characteristics and impedance characteristics of an air spring connected an auxiliary chamber.

분할연소실내의 대향분출화염의 연소특성에 관한 연구 (A Study on the Combustion Characteristics of Opposed-jet-Flames in a Divided Combustion Chamber)

  • 조경국;정인석;정경석
    • 오토저널
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    • 제9권4호
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    • pp.50-60
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    • 1987
  • Combustion characteristics of opposed-jet-flames spouting out from dual prechambers of a divided combustion chamber were investigated by using high speed schilieren photography and chamber pressure measurement. Result shows that opposed-jet-flames are characterized by the parameter ( $A_{ori}$/ $V_{p}$) and there exists a certain critical value of ( $A_{ori}$/ $V_{p}$)c which distinguishes flame propagation patterns in the main chamber. Also higher chamber pressure and shorter total burning time can be derived by adopting this dual prechamber divided combustion chamber, which would lead a possibility of an appropriate combustion method of high load and low emissions.ons.ons.

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소형 디퓨저의 최적화 설계 (Optimization Design of Compact Diffuser)

  • 이영태
    • 반도체디스플레이기술학회지
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    • 제21권4호
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    • pp.163-167
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    • 2022
  • In this paper, an optimization design method of a diffuser using Bernoulli's theorem was reviewed. The aspect ratio of the cylindrical diffuser chamber and the diameter ratio of the air inlet and outlet were used as design parameters. For the optimal design of the cylindrical diffuser chamber, the air flow inside the chamber was simulated using ANSYS while changing the aspect ratio of the chamber. In order to confirm the simulation results, the diffuser manufactured using the laser processing machine was measured. Through ANSYS simulation and measurement, it was found that the optimal design condition was when the aspect ratio (chamber height/radius) of the diffuser chamber was 1/2 and the diameter ratio of the air inlet and outlet was also 1/2.

석굴암, 세 번의 수리 공사와 세 개의 공간 개념 - 석굴암 건축과 안팎의 공간 구분을 중심으로 - (Thrice Repair Works and Three Space Conceptions in Seokguram - focusing on Seokguram Architecture and Virtual Space Division of Inside and Outside -)

  • 윤재신
    • 대한건축학회논문집:계획계
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    • 제35권8호
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    • pp.89-100
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    • 2019
  • The purpose of this study is to critically review the repair works of Seokguram architecture and to search for its original form and space. Seokguram's architectural form has been transformed throughout three repair works. The first transformation occurred during the repair work of the Colonial Government in 1913-1915, and the second occurred during the repair work of the Colonial Government in 1920-1923. The repair work done by the Korean Government in 1961-1964 also caused a severe change in the architectural form and space of Seokguram architecture. The more the repair work was added to Seokguram, the more its original form flew away like a mirage. Through the three repair works, the spatial composition of Seokguram changed in the following directions: from ((front chamber + passageway) + main chamber) to (front chamber + (passageway + main chamber)) through the second repair work, from (front chamber + (passageway + main chamber)) to (front chamber + passageway + main chamber) through the last repair work. Although the compositional space hierarchy of Seokguram was maintained during the first repair work, the architectural form based on the dry method was changed to the form based on the wet method. The Korean government's repair work was a tragedy for the 'Seokguram conservation project' that the people who led the conservation process misunderstood the architectural nature of Seokguram.

축소잔향실의 저주파수 확산음장 형성 방법에 대한 연구 (Study on method of build up low-frequency diffuse sound field in a scaled reverberation chamber)

  • 강준구;강현주;김상렬;최종수
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 춘계학술대회논문집
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    • pp.61-64
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    • 2007
  • This study is dealt with a method to enhance low-frequency diffuse sound field in a scaled reverberation chamber. Because scaled reverberation chamber has not enough room volume, as a result, it shows a few room modes. So it is not build up low-frequency diffuse sound field. A Helmholtz resonator's arrangement is used to improve spatial uniformity of sound pressure at low frequency. The spatial distribution of sound field has been measured before and after control. The standard deviation of sound field has decreased at 315Hz 1/3 Octave band.

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우주환경모사 진공실험 시설에서의 미소추력 측정방법 (Method of Micro-thrust Measurement in Vacuum chamber for Space Applications)

  • 정성철;신강창;이민재;김혜환;허환일
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2006년도 제27회 추계학술대회논문집
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    • pp.67-70
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    • 2006
  • 본 논문에서는 진공실험 시설에서의 여러 미소추력 측정방법에 대한 소개와 필요성을 말하고 있다. 이는 실제 마이크로 인공위성에 적용을 위한 마이크로 추력기 개발을 위해 필수적인 요소이다. 우주환경모사를 위해 충남대학교 고진공 설비를 구축하였으며, 이 설비에서 효율적인 미소추력 측정이 이루어질 수 있도록 진공 챔버 내의 미소 추력측정 방법에 대한 연구를 진행하였다.

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