• Title/Summary/Keyword: Additional Combustion

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The Design and Hot-firing Tests of a regenerative-cooled Sub-scale Combustor (재생냉각 축소형 연소기의 설계 및 연소시험)

  • Lee, Kwang-Jin;Kim, Jong-Gyu;Lim, Byoung-Jik;Kim, Hong-Jip;Seo, Seong-Hyeon;Han, Yeoung-Min;Choi, Hwan-Seok
    • Aerospace Engineering and Technology
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    • v.6 no.2
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    • pp.141-149
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    • 2007
  • It was carried out hot-firing test with a regenerative-cooled sub-scale combustor which was applied regenerative-cooling, film cooling and thermal barrier coating. Test results showed that cooling methods used in the combustor play an full role in the operation of the combustor under the design condition but it is occurred high frequency combustion instability due to unsteady flow of fuel by structural support ring inserted in fuel manifold. The flow pattern of fuel was improved by excluding the ring and it will be carried out additional hot-firing test to verify the combustion stability of modified combustor.

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Specific Impulse Variation of a Liquid Rocket Engine by Film Cooling (막냉각에 의한 액체로켓엔진의 비추력 변화)

  • Cho, Won-Kook;Park, Soon-Young;Seol, Woo-Seok
    • Aerospace Engineering and Technology
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    • v.8 no.2
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    • pp.133-139
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    • 2009
  • An analysis has been performed on the specific impulse for a liquid rocket engine of gas generator cycle. The present analysis method has been validated through the comparison of the optimal specific impulse for the 300t thrust conceptual engine against the published data. The engine specific impulse can be increased by applying film coolant decreasing the fuel pump head for regenerative cooling despite the decrease of specific impulse of the combustion chamber when the film coolant participates combustion more than the critical amount. The improved condition shows that higher combustion chamber pressure is achieved with less fuel pump head rise by additional film cooling.

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Phase-resolved CARS Temperature Measurements in a Lean Premixed Gas Turbine Combustor;Effect of fuel/air mixing on phase-resolved gas temperature (CARS를 이용한 희박 예혼합 가스터빈 연소기내 온도 측정(1);연료/공기 혼합정도가 위상별 온도에 미치는 영향)

  • Moon, Gun-Feel;Lee, Jong-Ho;Park, Chul-Woong;Hahn, Jae-Won;Jeon, Chung-Hwan;Chang, Young-June
    • 한국연소학회:학술대회논문집
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    • 2003.12a
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    • pp.97-102
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    • 2003
  • Experimental investigations were carried out in an atmospheric pressure, optically accessible and laboratory-scale dump combustor operating on natural gas. The objective of this study is to obtain the phase-resolved gas temperatures at different phases of the oscillating pressure cycle during unstable combustion. CARS temperature measurements were made at several spatial locations under lean premixed conditions to get the information on temperature field within the combustor. Also the effect of incomplete fuel-air mixing on phase-resolved temperature fluctuation was investigated. Results including phase-resolved averaged temperature, normalized standard deviation and temperature probability distribution functions (PDFs) were provided in this paper. Temperature PDFs give an insight on the flame behavior. And strong correlation between phase-resolved temperature profile and pressure cycle was observed. Results of the phase-resolved high temperature give an additional information on the perturbation of equivalence ratio at flame as well as the effect of mixing quality on NOx emission characteristics.

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Structure of Edge Flame in a Methane-Oxygen Mixing Layer (메탄/순산소 혼합층에서 Edge Flame의 구조)

  • Choi, S.K.;Kim, J.;Chung, S.H.;Kim, J.S.
    • Journal of the Korean Society of Combustion
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    • v.11 no.1
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    • pp.19-26
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    • 2006
  • Structure of edge flame established in a mixing layer, formed between two uniformly flowing pure $CH_4$ and pure $O_2$ streams, is numerically investigated by employing a detailed methane-oxidation mechanism. The numerical results exhibited the most outstanding distinction of using pure oxygen in the fuel-rich premixed-flame front, through which the carbon-containing compound is found to leak mainly in the form of CO instead of HC compounds, contrary to the rich $CH_4-air$ premixed flames in which $CH_4$ as well as $C_2H_m$ leakage can occur. Moreover, while passing through the rich premixed flame, a major route for CO production, in addition to the direct $CH_4$ decomposition, is found to be $C_2H_m$ compound formation followed by their decomposition into CO. Beyond the rich premixed flame front, CO is further oxidized into $CO_2$ in a broad diffusion-flame-like reaction zone located around moderately fuel-rich side of the stoichiometric mixture by the OH radical from the fuel-lean premixed-flame front. Since the secondary CO production through $C_2H_m$ decomposition has a relatively strong reaction intensity, an additional heat-release branch appears and the resulting heat-release profile can no longer be seen as a tribrachial structure.

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System Analysis of the Liquid Rocket Engine with Staged Combustion Cycle (단계식 연소 사이클 액체로켓엔진의 시스템 해석)

  • Lee, Sang-Bok;Lim, Tae-Kyu;Yoo, Seung-Young;Oh, Seok-Hwan;Roh, Tae-Seoung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.46-51
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    • 2012
  • This study aims to develop the performance analysis program on the staged combustion cycle of the liquid rocket engine using liquid oxygen(LOx) as oxidizer, liquid hydrogen(LH2) and RP-1 as fuel. The developed analysis program can obtain the propellant mass flow rate, the specific impulse, and representative design values of engine components for the required thrust satisfying pressure, mass flow, and energy balance conditions. The analysis results show that the the specific impulses (Isp) compared to those of the real engines have been less than 1%. With additional constraints, the program will be improved for the system optimization.

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Analysis of Efficiency Enhancement of the Integrated Gasification Combined Cycle with Oxy-Combustion Carbon Capture by Changing the Oxygen Supply System (순산소연소 이산화탄소 포집을 적용한 석탄가스화 복합화력 발전시스템에서 산소공급방식 변경에 의한 효율향상 분석)

  • CHO, YEON WOO;AHN, JI HO;KIM, TONG SEOP
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.4
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    • pp.347-355
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    • 2019
  • As a solution to the growing concern on the global warming, researches are being actively carried out to apply carbon dioxide capture and storage technology to power generation systems. In this study, the integrated gasification combined cycle (IGCC) adopting oxy-combustion carbon capture was modeled and the effect of replacing the conventional air separation unit (ASU) with the ion transport membrane (ITM) on the net system efficiency was analyzed. The ITM-based system was predicted to consume less net auxiliary power owing to an additional nitrogen expander. Even with a regular pressure ratio which is 21, the ITM-based system would provide a higher net efficiency than the optimized ASU-based system which should be designed with a very high pressure ratio around 90. The optimal net efficiency of the ITM-based system is more than 3% higher than that of the ASU-based system. The influence of the operating pressure and temperature of the ITM on system efficiency was predicted to be marginal.

Improvement of Transient Characteristics of Brush-less Type Synchronous Generator for Emergency Driven by Internal-Combustion Engine (내연기관 구동 비상용 브러시리스형 동기발전기의 과도특성 개선)

  • An, Young-Joo
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.4
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    • pp.268-272
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    • 2016
  • A brush-less type synchronous generator is driven by an internal-combustion engine that is used for emergency source. This kind of generator has to maintain output voltage in a range of some degree under the abrupt load irregular conditions such as a full load trip. This paper suggests a suppression method of increasing the output voltage over the rating. Automatic voltage regulator detects excessive rising of output voltage of the generator and supplies the signals to a switch installed in the rotating exciter through the photo-coupler. The current of main field rapidly decreases by additional resistor of the main filed circuit. Therefore, the output voltage of the generator is maintained effectively. The experimental results verified that the excessive value of the output voltage is limited in the range of 7% of the rated voltage.

Process Modeling of the Coal-firing Power Plant as a Testbed for the Improvement of the System and Equipment (화력발전 시스템 및 설비 개선 실증을 위한 열물질정산 공정모델 개발)

  • Ahn, Hyungjun;Choi, Seukcheun;Lee, Youngjae;Kim, Beom Soo
    • Journal of the Korean Society of Combustion
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    • v.23 no.1
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    • pp.44-54
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    • 2018
  • Heat and mass balance process modeling has been conducted for a coal-firing power plant to be used as a testbed facility for development of various plant systems and equipment. As the material and design of the boiler tube bundle and fuel conversion to the biomass have become major concerns, the process modeling is required to incorporate those features in its calculation. The simulation cases for two different generation load show the satisfying results compared to the operational data from the actual system. Based on the established process conditions, the hypothetical case using wood pellet has also been simulated. Additional calculations for the tube bundle has been conducted regarding the changes in the tube material and design.

Numerical Analysis of Sintering Bed Combustion; Applying Supplying Gaseous Fuel and Flue Gas Recirculation Processes (소결 베드 연소 수치해석의 확장 - 가스 연료 주입 및 배가스 재순환 공정 적용)

  • Lee, Younghun;Yang, Won;Cho, Byungkook;Choi, Sangmin
    • 한국연소학회:학술대회논문집
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    • 2012.11a
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    • pp.9-13
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    • 2012
  • In the iron ore sinter process, temperature distribution pattern in sintering bed is related with productivity and quality of sintered ore. Evenly heat distribution make the uniform quality of sintered ore but in normal operating condition, upper part of bed has lack of heat and scarce quality of sintered ore, thus yeild rate is decreased and productivity is diminished. Therefore, using the additional fuel for increasing quality and flue gas recirculation for increasing productivity are considered and effect of both processes are discussed.

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Development of injection lance position control method using fine Bituminous Coal combustion Image Analysis (미분탄 화염 영상 분석을 통한 취입랜스 최적 제어 기법 개발)

  • Kim, Chi-Yen;Lee, Min-Cheol;Baek, Jun-Young;Jeong, Do-Young;Ahn, Young-Jin
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.806-810
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    • 2008
  • This paper introduces the automatic fine Bituminous Coal injection lance position control method using flame image process. The fine Coal injection lance is used to supply additional heat into the furnace in Mill plant. It injects fine coal into high pressured air flow and produces very heated and high pressured flame. For the such high temperature and pressure, the fine coal injection lance effects not only efficiency of burner but also furnace abrasion. To keep efficient combustion status and to avoid the abrasion, in this paper, the flame is monitored by computer image process. This paper proposes the flame image process method and lance position control according to calculated result for flame image process.

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