• Title/Summary/Keyword: 연소 개념

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Fluidic Characteristics of Precessing Jet Nozzle Combustor (세차제트노즐 연소기의 유동특성)

  • Lee, Hye-Young;Huh, Hwan-Il
    • Journal of the Korean Society of Propulsion Engineers
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    • v.11 no.4
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    • pp.1-9
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    • 2007
  • Many processing companies are facing environmental regulations such as decreasing NOx emissions when they by to increase thermal efficiencies of combustor. We study a potential new method that may achieve both increase of thermal efficiency and decrease of NOx emissions. This new concept of burner, the precessing jet burner, is known to significantly reduce pollutants such as NOx emissions and simultaneously increase radial heat transfer. This precessing jet nozzle may increase the combustion efficiency of gas turbine engine. A basic research on characteristics of precessing jet nozzle has been conducted using FLUENT and laser visualization technique. Velocities at He nozzle cross-section are compared with the published experimental results. Precessing jet nozzle with centerbody results in better precessing phenomena.

The Combustion Characteristics of a New Cyclone Jet Hybrid Combustor for Low Pollutant Emission and High Flame Stability (저공해와 고안정성을 위한 신개념의 사이클론 제트 하이브리드 연소기의 연소특성)

  • Jung, Won-Suk;Hwang, Chul-Hong;Lee, Gyou-Young;Lee, Chang-Eon
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.2
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    • pp.146-153
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    • 2004
  • A Promising new approach to achieve low pollutant emissions and improvement of flame stability is tested experimentally using a cyclone jet hybrid combustor employing both premixed and diffusion combustion mode. Three kinds of nozzle are tested for mixing enhancement of fuel and air. The LNG (Liquified Natural Gas) is used as a fuel. The combustor is operated by two methods. One is DC (Diffusion Combustion) mode generated swirl flow by air as general swirl combustor, and the other is HC (Hybrid Combustion) mode. The HC mode consists of diffusion jet flame of axial direction and premixed cyclone flame of tangential direction in order to stabilized the diffusion jet flame. The results showed that the flame stability of HC mode is significantly enhanced than that of DC mode through the change of mixing characteristics by modifications of fuel nozzle. In addition, the reductions of CO and NOx emission in HC mode, as compared with that for the DC mode, is large than about 50% in stable region. Also, even using the low calorific fuel as $CO_2$-blended gas, it is identified that the cyclone jet hybrid combustor has the high performance of flame stability.

A Study on determinate method of propellant burning area with single grain shape (단일 그레인을 갖는 추진기관 그레인의 연소표면적 산출기법 연구)

  • Kang, Kyoung-Hoon;Lee, Jun-Ho;Song, Sin-Yeong;Chung, Jon-Rok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.121-125
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    • 2010
  • In this study, we have constructed this algorithm that theoretical method for prediction performance of the internal ballastic analysis. And we have confirmed reliability, compared the value calculated by realized program with the value computed by modeling program. A basic concept of algorithm expresses combustion phenomenon to move each factor(node) according to the time increment like as Finite element method. And we have confirmed this realized program has sufficient possibility to utilize in the internal ballastic analysis.

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심지층처분시스템 설정을 위한 기준 사용후핵연료 선정

  • 최종원;고원일;강철형
    • Proceedings of the Korean Nuclear Society Conference
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    • 1998.05b
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    • pp.458-463
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    • 1998
  • 고준위방사성페기물의 기준 처분시스템 (Reference Geological Disposal System)의 개념설정을 위하여 현재 국내 원전에서 발생되고 있거나 향후 2010까지 건설될 원전으로부터 발생될 모든 사용 후 핵연료연료의 특성(크기, 무게, 초기농축도, 연소도, 냉각기간 등)을 대표할 수 있는 기준 사용 후 핵연료를 선정하였다.

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탄도 미사일 방어체계 기술 현황

  • Lee, Gyu-Jong
    • Defense and Technology
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    • no.1 s.251
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    • pp.54-63
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    • 2000
  • 탄도 미사일의 요격은 로켓 모터가 연소 중인 부스트 단계에서 이루어지는 경우, 대기권 밖의 고층(고고도)에서 이루어지는 경우, 그리고 대기권에 재돌입한 후 저층(저고도)에서 이루어지는 경우를 생각할 수 있는데 이와 같은 방어 개념을 다층 방어라고 한다. 다층 방어에서는 탄도 미사일을 요격할 수 있는 기회가 많이 주어지기 때문에 탄도 미사일의 공격으로부터 자국 영토를 안전하게 방어하기 위해서는 꼭 필요한 시스템이라고 할 수 있다.

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탄도 미사일 방어체계 기술 현황 (2)

  • Lee, Gyu-Jong
    • Defense and Technology
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    • no.2 s.252
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    • pp.58-65
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    • 2000
  • 탄도 미사일의 요격은 로켓 모터가 연소 중인 부스트 단계에서 이루어지는 경우, 대기권 밖의 고층(고고도)에서 이루어지는 경우, 그리고 대기권에 재돌입한 후 저층(저고도)에서 이루어지는 경우를 생각할 수 있는데 이와 같은 방어 개념을 다층 방어라고 한다. 다층 방어에서는 탄도 미사일을 요격할 수 있는 기회가 많이 주어지기 때문에 탄도 미사일의 공격으로부터 자국 영토를 안전하게 방어하기 위해서는 꼭 필요한 시스템이라고 할 수 있다.

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변칙 사례의 특성이 인지 갈등과 개념 변화에 미치는 영향

  • Gang, Seok Jin;Kim, Sun Ju;No, Tae Hui
    • Journal of the Korean Chemical Society
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    • v.45 no.6
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    • pp.589-594
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    • 2001
  • In this study, the effects of the number and the presentational type of anomalous data on students'cognitive conflict and conceptual change in studying 'conservation of mass before and after combustion'were investigated. The subjects were 128 eighth graders in a co-ed middle school. A preconception test, a test of response to anomalous data, and a conception test were administered. Four types of anomalous data varying the number (one/two) and the presentational type (text/text+figure) were presented. The results indicated that students with two anomalous data showed more cognitive conflicts than those with one. However, no significant differences in the degree of cognitive conflict were found by the presentational types of anomalous data. The ANOVA results indicated that there were no significant differences by the characteristics of anomalous data in the conception test scores.

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Concept Design on Heating System for Supersonic Air-Breathing Engine Test Facility (초음속 유도무기 지상 시험용 가열기 개념 설계)

  • Han Poong-Gyoo;NamKoung Hyuck-Joon;Lee Kyoung-Hoon;Kim Young-Soo
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.05a
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    • pp.321-326
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    • 2006
  • Vitiated air heater which could supply air of 700K and 6 bar was designed conceptually for the firing test on the ground of the air breathing propulsion engines. This vitiated air heater consists of premixer with air and excessive gas oxygen, mixing head, combustor with gas passage, convergent-divergent nozzle and diffuser. the fuel was natural gas and/or liquefied natural gas. Through computational fluid dynamics, each component of the air heater was analyzed and flame-holding after ignition was investigated.

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Study on the Heat Recovery Design Methods for the Flue Gas from Combustion and Incineration Processes (연소 또는 소각 과정에서 발생하는 배기가스의 폐열 회수 설계 방법에 관한 연구)

  • Lee, Chan;Jung, Bong-Jin
    • Clean Technology
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    • v.5 no.2
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    • pp.53-61
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    • 1999
  • Presented is the design method of the waste heat recovery facility for the flue gas produced from combustion and incineration processes of large industrial environmental waste treatment and cogeneration plants. The present study assumes the basic design concept of wast heat recovery facility as the combination of waste heat recovery boiler and steam power cycle, and then describes the modeling technique, the design concept and criteria of each component of waste heat recovery facility. In addition, the present study investigates how the thermal performance of waste heat recovery facility varies with boiler operating pressure and waste heat recovery heat exchanger design at the same flue gas condition.

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Ammonia Combustion Characteristics and Technology Development Trend (암모니아 연소 특성 및 기술개발 동향)

  • Min Jung Lee;Yusung Kim;Chaewoon Ma;Junhee Bae;Chanbin Yeom
    • Journal of the Korean Institute of Gas
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    • v.27 no.3
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    • pp.11-18
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    • 2023
  • This study explained the need for ammonia fuel and the value chain as a hydrogen carrier. The basic concept of ammonia combustion characteristics and the development of flame stability and low NOx combustion technology were introduced. In addition, through the trend of ammonia combustion technology, the characteristics of ammonia combustion technology in the power generation and industrial sectors were examined, and the author's opinions were included. Through this paper, the author intends to give some overview of basic knowledge about ammonia fuel and its future development direction and meaning.