• Title/Summary/Keyword: 물출구 온도

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Combustion Characteristics of Fuel-rich Gas Generator with Impinging Injector for a Liquid Rocket Engine (액체로켓엔진에서 충돌형 분사기 형태의 연료과잉 가스발생기 연소특성)

  • Han, Yeoung-Min;Kim, Seung-Han;Lee, Kwang-Jin;Moon, Il-Yoon;Seol, Woo-Seok;Lee, Chang-Jin
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.6
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    • pp.64-70
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    • 2005
  • The overall results of hot firing tests of fuel-rich gas generator with impinging injector at design and off-design points are described. The gas generator consists of an injector head with impinging injector, a water cooled combustor wall, a turbulence ring to enhance mixing, an instrument ring measuring temperature and pressure and a nozzle. The combustion tests were successfully performed without damage of gas generator. Test results show that the outlet temperature is not dependent on residence time of hot gas within 4~6msec but dependent on chamber pressure. The relation between outlet temperature and combustion efficiency resulting from measured pressure, mass flow rate and area of nozzle throat is shown. The overall O/F ratio is the critical parameter to determine the outlet temperature and the linear correlation between two parameters is established.

원심압축기에서 물분사 압축과정에 대한 이론적 해석

  • Kang, Jeong-Seek;Cha, Bong-Jun;Yang, Soo-Seok
    • Aerospace Engineering and Technology
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    • v.4 no.1
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    • pp.18-24
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    • 2005
  • Wet compression means the injection of water droplets into the compressor of gas turbines. This method decreases the compression work and increases the turbine output by decreasing the compressor exit temperature through the evaporation of water droplets inside the compressor. This paper provides thermodynamic and aerodynamic analysis on wet compression in a centrifugal compressor for a microturbine. The meanline performance analysis of centrifugal compressor is coupled with the thermodynamic equation of wet compression to get the meanline performance of wet compression. The most influencing parameter in the analysis is the evaporative rate of water droplets. It is found that the impeller exit flow temperature and compression work decreases as the evaporative rate increases. And the exit flow angle decreases as the evaporative rate increases.

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Experimental Study on Combustion Performances with Variations in Main Air-ratio and Dilution hole-pattern (주연소 영역 공기배분 및 희석공기공 배치에 따른 연소 성능 변화 연구)

  • Kim, Minkuk;Kim, Hanseok;Jung, Seungchai;Park, Heeho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.254-257
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    • 2017
  • As a part of the development of aircraft gas turbines, combustion performance tests have been conducted in the single combustor sector. The effects of change in the amount of air supplied to the main combustion zone to the performance of the combustor, such as a pollutant emission, a liner temperature distribution and an exit temperature patterns, were studied. Emissions of CO and NOx increased with the main air-ratio and exit temperature pattern was improved. When changing the pattern of the dilution holes, it was shown that the temperature patterns on the exit plane of the combustor and the surface of liner changed depending on the main flame structure and mixing with diluent air. These observations will be applied to combustor liner designs to improve combustor durability and emissions reduction performance.

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The Cooling Effect Using Pad & Fan in Greenhouse (패드엔팬을 이용한 온실냉방효과)

  • 장유섭;김동억;이동현
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2002.02a
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    • pp.223-229
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    • 2002
  • 패드엔팬을 이용하여 물 공급량, 팬 회전속도의 변화에 따른 온실 냉방효과 시험한 결과를 요약하면 다음과 같다. 가. 패드에 흐르는 물 공급량별로 일중 11:00-16:00경에 물 공급량이 분당 60$\ell$이상 공급하면 8.0~9.5$^{\circ}C$의 온도차를 낼 수 있으며, 팬을 1170rpm으로 회전시킬 경우 6.0~9.$0^{\circ}C$의 온도차를 낼 수 있었다. 나. 온실과 팬출구 공기의 온도차는 일중 14:30~16:00 경에 60$\ell$이상의 물을 패드에 공급하는 경우 6.0~7.8$^{\circ}C$ 온도 강하 효과가 있고 팬을 1170rpm으로 회전시킬 경우에는 외기온 28$^{\circ}C$일 때 3$0^{\circ}C$이하로 온도를 강하시킬 수 있었다. 다. 패드에 흘리는 물의량을 60 $\ell$/min 이상을 공급하여 주면 30분당 20~28$\ell$의 물을 증발시킬 수 있다. 배출팬 회전속도가 1170rpm일 경우에 30분당 20~30$\ell$의 물을 증발시키는 것으로 나타났다. 라. 본시험에 사용된 패드엔팬의 흡.배기의 엔탈피변화는 8:30이전에는 흡기가 배기보다 온도가 낮아 엔탈피가 양(+)의 값을 나타났고, 8:30 이후에는 흡기가 배기 보다 온도가 높아 -2.0~-4.OkJ/kg의 엔탈피 차만큼 냉각효과가 있었으며, 냉방효율을 65~80% 수준으로 나타났다. 마. 본시험결과로 패드엔팬의 냉기 공급방식만 개선된다면 이동식인 박스형 패드엔팬도 냉방장치로 사용 가능할 것으로 판단된다.

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Performance Analysis of Centrifugal Compressor in Wet Compression (물입자를 분사하는 원심압축기의 성능해석)

  • Kang Jeong-Seek;Cha Bong-Jun;Yang Soo-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • v.y2005m4
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    • pp.237-242
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    • 2005
  • The energy consumed by compressor in gas turbine is equivalent to $30\sim50\%$ of energy produced by turbine and, therefore, research on reducing compression work is important in increasing the efficiency of gas turbine. One of the method to reduce the compression work is to inject small water droplets into the compressor. This method decreases the compression work by decreasing the compressor exit temperature through the evaporation of water. Researches on wet compression, up to now, are focused on thermodynamic analysis of wet compression where the decrease of exit flow temperature and compression work is demonstrated. This paper presents an thermodynamic and aerodynamic analysis of wet compression in centrifugal compressor for microturbine.

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Combustion Performance Tests of Fuel-Rich Gas Generator for Liquid Rocket Engine at Design Point (액체로켓엔진용 가스발생기의 연소성능시험)

  • Han, Yeoung-Min;Kim, Seung-Han;Moon, Il-Yoon;Kim, Hong-Jip;Kim, Jong-Gyu;Seol, Woo-Seok;Lee, Soo-Yong;Kwon, Sun-Tak;Lee, Chang-Jin
    • 한국연소학회:학술대회논문집
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    • 2003.12a
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    • pp.125-130
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    • 2003
  • 본 논문에서는 액체로켓엔진에서 터보펌프의 160kW급 터빈을 구동하고, 액체산소와 케로신을 추진제로 사용하는 가스발생기의 설계점 연소성능시험 결과에 대해 논의하였다. 충돌형 F-O-F 인젝터, 물냉각 채널을 가진 연소실, torch ignitor, turbulence ring 그리고 측정 링을 갖는 가스발생기에 대해 기술하였고, 점화, 연소, 종료 등의 시험 cyclogram에 대해 언급하였다. 설계점에서의 연소시험 및 turbulence ring 장착여부, 연소실 길이 변화에 따른 연소시험의 결과들에 대해 기술하였다. 연소시험 결과 가스발생기는 설계점에서 안정된 작동성을 보여주었고, 연소압력 및 온도 등의 성능이 예측치에 근접하는 결과를 보여 주었다. Turbulence ring은 출구에서의 가스온도를 균일하게 분포시켜 효과적인 혼합 장치임을 보여 주었고, 4-6msec 정도에서의 잔류시간에서는 연소효율의 차이가 크지 않음을 알 수 있었다. 가스발생기 출구에서의 온도는 공급되는 추진제의 O/F ratio에 따라 매우 민감하게 반응함을 알 수 있었다.

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Combustion Performance Tests of Fuel-Rich Gas Generator for Liquid Rocket Engine Using an Impinging Injector (충돌형 분사기 형태의 액체로켓엔진용 가스발생기 연소성능시험)

  • 한영민;김승한;문일윤;김홍집;김종규;설우석;이수용;권순탁;이창진
    • Journal of the Korean Society of Propulsion Engineers
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    • v.8 no.2
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    • pp.10-17
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    • 2004
  • The results of the combustion performance tests of gas generator which supplies hot gas into the turbine of turbo-pump for liquid rocket engine and uses LOx and kerosene as propellant are described. The gas generator consists of a injector head with F-O-F impinging injector, a water cooled combustion chamber, a gas torch igniter, a turbulence ring and an instrument ring. The effect of turbulence ring and combustion chamber length on performance of gas generator are investigated. The ignition and combustion at design point are stable and the pressure and gas temperature at gas generator exit meets the target. The turbulence ring installed at middle of chamber effectively mixes hot gas with cold gas and the effect of residence time of hot gas in gas generator on combustion efficiency is small. Test results show that the main parameter controlling the gas temperature at gas generator exit is overall O/F ratio.

Test of Heat Recovery Performance of a Microturbine (마이크로터빈의 열회수 성능시험)

  • Jeon, Mu-Sung;Lee, Jong-Jun;Kim, Tong-Seop;Chang, Se-Dong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.8
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    • pp.629-635
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    • 2008
  • Recently, microturbines have received attention as a small-scale distributed power generator. Since the exhaust gas carries all of the heat release, the microturbine CHP (combined heat and power) system is relatively compact and easy to maintain. Generating hot water or steam is usual method of heat recovery from the microturbine. In this work, a heat recovery unit producing hot water was installed at the exhaust side of a 30 kW class microturbine and its performance characteristics following microturbine power variation was investigated. Heat recovery performance has been compared for different operating conditions such as constant hot water temperature and constant water flow rate. In particular, the influence of water flow rate and hot water temperature on the recovered heat was analyzed.

Development of a New Heat Exchanger for the Super Cooling (HESC) to Enhance the Performance of the Heat Pump System for the Living Space by the Natural Energy (자연에너지를 이용한 생활공간 냉난방용 열펌프의 성능향상을 위한 과냉 촉진 신개념 열교환기(HESC) 개발)

  • Song, Heon
    • Journal of the Korean Solar Energy Society
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    • v.31 no.6
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    • pp.40-48
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    • 2011
  • 과냉 촉진을 위한 새로운 열교환기(HESC)가 생활공간의 냉난방을 위한 공기-물 열펌프의 성능계수 향상을 위해 본 연구에서 개발되었으며 그 효과를 실험적으로 분석하였다. 이 열교환기(HESC)는 여러 단계의 셀과 튜브로 구성되어 있으며, 열펌프 시스템의 응축기와 증발기 사이에 장착되었다. 실험 조건으로, 외기온은 $7^{\circ}C$에서 $-17^{\circ}C$, 입구 물 온도는 $7{\sim}10^{\circ}C$ 그리고 제 2열전달매체로서 물의 질량 유동율은 시간당 100에서 $300{\ell}$로 변화를 주었다. 본 실험에서 이 열교환기가 장착된 열펌프의 압축기에서의 냉매 입 출구 사이의 온도 차이는 열교환기가 장착되지 않은 열펌프보다 $15^{\circ}C$ 높았다. 이에 따라 이 열교환기가 장착된 열펌프 시스템은 외기온 $-10^{\circ}C$에서 COP가 0.8 증가하였다. 따라서 이 공기-물 열펌프 시스템은 최근 한국에서 실용화되고 있는 고비용이 요구되는 지열 열펌프 시스템을 대체하여 생활공간을 위한 냉난방 시스템으로서 중요한 역할을 할 수 있을 것으로 사료된다.

Parametric Analysis of the Performance of Water Recirculated Oxy-Fuel Power Generation Systems (물을 재순환하는 순산소 발전 시스템의 작동조건 변화에 따른 성능해석)

  • Park, Byung-Chul;Sohn, Jeong-Lak;Kim, Tong-Seop;Ahn, Kook-Young;Kang, Shin-Hyoung;Lee, Young-Duk
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.34 no.1
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    • pp.35-43
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    • 2010
  • In this study, an ideal water-recirculated oxy-fuel power generation system is proposed. The results of parametric studies of the performance characteristics of the system are discussed. For a given choice of the turbine inlet temperature, the turbine, which produces power, can be either a gas or a steam turbine. For maximum efficiency, the turbine inlet temperature is selected as the level of state-of-the-art gas turbines and the reheat cycle may be adopted not only to enhance the turbine power but also to maintain dryness of the water with a turbine exhaust temperature that is as high as possible. To obtain a low condensation temperature for a high purity of $CO_2$, a relatively low pressure expansion process may be added. Finally, the performance of the water-recirculated oxy-fuel power generation system is discussed with reference to various operating parameters and system configurations. The optimal operating conditions for high performance and a high purity of $CO_2$ are proposed.