• 제목/요약/키워드: 연소 기술

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Operation Techniques of Liquid Rocket Engine Combustor Ground Firing Test Facility (액체로켓엔진 연소기 지상연소시험설비 운영관리 기술)

  • Kang, Dong-Hyuk;Lim, Byoung-Jik;Moon, Il-Yoon;Seo, Seong-Hyeon;Han, Yeoung-Min;Choi, Hwan-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.11a
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    • pp.157-162
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    • 2006
  • A Liquid Rocket Engine(LRE) ground firing test facility was built in Korea Aerospace Research Institute(KARI) in 2001 to develop the LRE for the first Korean liquid rocket, KSR-III. Around 170 tests were conducted since its establishment until recently by September 2006, and in the meantime, a considerable improvements were made in the capability. This paper describes the outline, conducted tests and operation techniques which have been accumulated through the operation of KARI LRE ground firing test facility.

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An Application of Dynamic Radioscopy Technique to Static Firing Test (동적 방사선투과검사를 이용한 지상연소시험 기술개발)

  • Lim, Soo-Yong;Kim, Jun-Yeop;Kim, In-Sik
    • Journal of the Korean Society of Propulsion Engineers
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    • v.10 no.3
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    • pp.32-40
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    • 2006
  • Dynamic Radioscopy technique was developed to observe internal phenomena of motors during firings. For use of this technique, generator and image box consisting of conversion screen, mirror, and video camera were designed and fabricated at our laboratory, and static firing tests were conducted to small motors. Protection devices against vibration and noise induced from during combustion were also made and their performances were evaluated with reference to the vibration criteria. Test results have shown that the vibration levels at concerned points were measured less than vibration criteria, and the internal phenomena during firings were also observed clearly.

Combustion Stability Rating Test under Low Pressure Condition of a 75-$ton_f$ LRE Thrust Chamber (75톤급 액체로켓엔진 연소기의 저압 조건에서 수행된 연소안정성 시험)

  • Lee, Kwang-Jin;Kang, Dong-Hyuk;Lim, Mun-Ki;Ahn, Kyu-Bok;Han, Yeoung-Min;Choi, Hwan-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.05a
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    • pp.231-238
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    • 2010
  • Combustion stability rating tests under condition low pressure of a 75-$ton_f$ liquid rocket engine(LRE) thrust chamber were carried out. Mixing head with decreased number of injectors than that of the other but with the same mass flow rate to the combustion chamber showed self-oscillation instability in chamber pressure of 30 bar. The other combustion chamber with increased number of injectors showed that high frequency combustion stability was maintained under condition of same pressure, but self-oscillation instability was generated in chamber pressure of 20 bar which can be considered as stability boundary region of this mixing head.

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Cold Flow and Ignition Tests for Technology Demonstration Model of 75-Tonf Thrust Chamber (75톤급 연소기 기술검증 시제 수류시험 및 점화시험)

  • Kim, Mun-Ki;Han, Yeoung-Min;Kim, Jong-Gyu;Ahn, Kyu-Bok;Lee, Kwang-Jin;Choi, Hwan-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.97-100
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    • 2009
  • Cold flow and ignition tests were performed for a technology demonstration model of a 75-tonf thrust chamber which is a candidate liquid rocket engine for a next Korea Space Launch Vehicle. The test facility was modified to support the new concepts of the thrust chamber such as ignition system, film cooling and LOx leading supply. The hydrodynamic characteristics of the supply pipelines, thrust chamber and igniter as well as the filling time of the propellants were obtained through the cold flow tests on the LOx and kerosene and the ignition cyclogram was determined using the results. The ignition test was successfully accomplished according to the cyclogram and therefore, a basic information was obtained for further hot firing tests.

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Hot-firing Test of Technology Demonstration Model Gas Generator for 75 ton-class Liquid Rocket Engine (75톤급 가스발생기 기술검증시제의 연소시험)

  • Ahn, Kyu-Bok;Seo, Seong-Hyeon;Kim, Mun-Ki;Lim, Byoung-Jik;Kim, Jong-Gyu;Lee, Kwang-Jin;Han, Yeoung-Min;Choi, Hwan-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.225-228
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    • 2009
  • Hot-firing tests were performed on the gas generator which is a technology development/demonstration model for a 75 ton-class liquid rocket engine. A heat-sink type combustion chamber was used for initial performance examination of the injector and mixing head. This paper explains not only preparation works for hot-firing tests but also the acquired results such as pressure, temperature distribution, and pressure fluctuation.

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Effect of Combustion Instability on Heat Transfer in a Subscale Thrust Chamber (연소불안정에 따른 축소형 연소기에서의 열전달 영향)

  • Ahn, Kyubok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.6
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    • pp.3403-3409
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    • 2014
  • Hot-firing tests were carried out using a mixing head with 19 swirl coaxial injectors and a combustion chamber with internal cooling channels. The propellants of liquid oxygen and kerosene(Jet A-1) were burned in a range of chamber pressures (59~82 bar) and mixture ratios (2.0~3.0). The temperature of water used as the cooling fluid was measured at the inlet and outlet of the cooling channels, and the heat flux was calculated. The aim of this study was to examine the effect of combustion instability on heat transfer in a subscale thrust chamber, and detect the temperature variation of cooling water. During several hot-firing tests, combustion instability was encountered which caused a 5~20% increase in heat flux. The peak heat flux took place in the initial stages of combustion instability.

Improment of Diesel Combustion using multiple injection under Cold Start Condition (냉시동 조건에서 디젤 연소 특성 및 연소 개선에 대한 연구)

  • Lee, Haeng-Soo;Lee, Jin-Woo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.4
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    • pp.711-717
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    • 2017
  • Startability and harmful emissions are the main issues in diesel engine development under cold conditions. The characteristics of combustion with multiple injection were investigated under cold start conditions. For quantitative analysis, the in-chamber pressure profile was measured and combustion visualization using direct imaging was accomplished. With multiple injection, the peak in-chamber pressure and heat release rate were increased compared to single injection. In addition, the period of flame luminosity detection was shortened using multiple injection. Combustion by main injection was improved with an increase in heat released by pilot combustion when the pilot injection quantity was increased. Finally, an increase in injection pressure also showed the possibility of combustion improvement. On the other hand, an increase of in the pilot injection quantity and injection pressure can cause an increase in harmful emissions, such as HC and CO due to wall wetting. Therefore, more sensitive calibration will be needed when applying a multiple injection strategy under cold start conditions.

Numerical Study on the Combustion and Exhausted Gases for Operating Conditions in a Fast Pyrolysis Power Boiler (폐기물 고열분해 동력 보일러의 운전 조건에 따른 연소 및 배출가스 특성에 관한 수치적 연구)

  • Lim, Ho;Hwang, Min-Young;Kim, Gyu-Bo;Park, Seong-Ryong;Jeon, Chung-Hwan
    • Clean Technology
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    • v.20 no.1
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    • pp.80-87
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    • 2014
  • Numerical study was investigated to obtain the database for developing a fast pyrolysis power boiler by waste fuel. The studies with various conditions were performed using ANSYS FLUENT. Also, the fuel properties was experimentally analyzed to utilize the input parameters for numerical analysis, that were proximate and ultimate analysis, reaction kinetics included pyrolysis and combustion. The results showed that temperature, combustion and exhausted gases was changed with heating value of fuel and feeding rate. Finally, the stable operating condition by analyzing results was proposed.

MILD Combustion Characteristics with Inlet Air Velocity in a Conical Combustor (원추형 연소로에서 공기 유속에 따른 MILD 연소특성)

  • Kim, Tae-Kwon;Ha, Ji-Soo;Jo, A-Ron
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.6
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    • pp.774-779
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    • 2012
  • MILD (Moderate and Intense Low Oxygen Dilution) combustion is a technology that uses the recirculation of combustion gas to increase thermal efficiency not only by keeping down the concentration of Nitric Oxides and temperature but also by uniformizing the internal temperature of the combustion furnace. This study is a trial to obtain MILD combustion characteristics by adjusting the equivalence ratio with the air flow rate in the conical combustor while keeping the fuel flow rate and measuring the exhaust gas of the combustion furnace.