• Title/Summary/Keyword: 탈설계 성능 Operating conditions

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Off-Design Performance Analysis of a Counterflow-Type Cooling Tower (대향류형 냉각탑의 탈설계 성능해석)

  • 신지영;손영석;한동원
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.3
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    • pp.191-198
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    • 2002
  • Cooling tower design procedure was set up using conventional Merkel theory, The design data could be different depending on the characteristic curve that the engineer chose. It reveals that the consistent and reasonable criteria are required based on the exact information of the cooling tower Performance. In this study, an off-design performance analysis program for a counterflow-type cooling tower was developed and verified by comparing with experimental data. Also, the off-design performance with various operating conditions was analyzed.

Management of Test Facility for Tests of Liquid Rocket Engine on Off-Design Condition (액체로켓엔진 탈설계 조건 시험을 위한 시험설비 운용)

  • Yu, Byungil;Kim, Hongjip;Han, Yeongmin
    • Journal of Aerospace System Engineering
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    • v.14 no.5
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    • pp.91-99
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    • 2020
  • A liquid rocket engine goes through many tests to prove its performance before liftoff. It means the tests for setting ignition and start-up conditions or a test on design condition, which verifies the design performance. However, the development process requires verification of performance under off-design conditions through tests involving different operating conditions, which affects the duration of engine development. The off-design performance test is performed by altering the conditions of the propellant supplied to the engine in conjunction with the engine performance test that varies the opening of the control valves in the engine. This paper is based on the results of the engine tests performed at the KSLV-II engine test facilities in the Naro Space Center and describes the operations of the test facility for off-design condition test that changes the inlet conditions of the turbo-pump due to changes in the pressure and temperature of the propellant supplied to the test engines.

The Effect of Thermal Management on the Performance of a Polymer Electrolyte Membrane Fuel Cell System (PEMFC의 열관리가 시스템의 성능에 미치는 영향)

  • Lee, Jeong-Ho;Myung, No-Sung;Kim, Tong-Seop
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.6
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    • pp.593-601
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    • 2011
  • An analysis program to simulate the operation of a polymer electrolyte membrane fuel cell (PEMFC) system was set up, and system operation with variations in the working conditions of various components (especially the thermal management system) was simulated. The entire system included a PEMFC stack and balance-of-plant components such as an air-supply unit, a fuel-supply unit, and a heat-management unit (cooling system). Thermodynamic models of all components were made to evaluate the design performance of the entire system, and then off-design models were set up to simulate the operation of the entire system under arbitrary working conditions. A parametric study was carried out to examine the effects of varying the operating conditions (especially the ambient conditions and the operating conditions of the cooling system) on the operation and performance of the entire system.

Performance Characteristics for Off-design Operation of Micro Gas Turbines (마이크로 가스터빈의 탈설계 운전 성능특성)

  • Kim, T.S.;Hwang, S.H.
    • The KSFM Journal of Fluid Machinery
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    • v.7 no.3 s.24
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    • pp.39-47
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    • 2004
  • Micro gas turbines are designed with low turbine inlet temperature and pressure ratio. To overcome the efficiency defect of the simple cycle, adoption of the recuperator is an inevitable choice. In addition to the design performance, we should also pay attention to the off-design performance of gas turbines since they usually operate at part-load conditions lot a considerable amount of their lifetime. This study analyzes off-design performance characteristics of micro gas turbines and addresses the importance of the recuperation process doting the part load operation. Comparative analyses have been performed to evaluate the part load performance differences among various design and operating options : simple vs recuperative cycles, single vs two shaft configurations, various operating strategies for the single shaft configuration, and current vs advanced engines. Major finding is that maintaining high turbine exhaust temperature is crucial for efficient operation of micro gas turbines.

Performance Characteristics for Off-design Operation of Micro Gas Turbines (마이크로 가스터빈의 탈설계 운전 성능특성)

  • Hwang, S.H.;Kim, T.S.
    • 유체기계공업학회:학술대회논문집
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    • 2003.12a
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    • pp.80-87
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    • 2003
  • Micro gas turbines are designed with low turbine inlet temperature and pressure ratio. To overcome the efficiency defect of the simple cycle, adoption of the recuperator is an inevitable choice. In addition to the design performance, we should also pay attention to the off-design performance of gas turbines since they usually operate at part-load conditions for a considerable amount of the time. This study aims at analyzing off-design performance characteristics of micro gas turbines and addressing the importance of the recuperator in the part load operation. Comparative analyses have been performed to evaluate the part load performance differences among various design and operating options : simple vs recuperative cycles, single vs two shaft configurations, various operating strategies for the single shaft configuration (fuel only control, variable speed operation, variable inlet guide vane control), and current vs advanced engines. Major finding is that maintaining turbine at high level is crucial in efficient operation of micro gas turbines.

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Performance Modeling and Off-design Performance Analysis of A Separative Jet Turbofan Engine Using SIMULINK (SIMULINK를 이용한 분리형 노즐을 갖는 터보팬엔진 성능모델 구성 및 탈설계점 성능 해석)

  • Kong, Chang-Duk;Park, Gil-Su;Lee, Kyung-Sun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.219-224
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    • 2012
  • In this work, a steady-state performance modeling and off-design performance analysis of the 2-spool separate jet turbofan engine named BR715-56 which is a power plant for the narrow body commercial aircraft is carried out for engine performance behaviors investigation and condition monitoring using a commercial code MATLAB/SIMULINK. Firstly, the engine component maps of fan, high pressure compressor, high pressure turbine and low pressure turbine are generated from similar component maps using the scaling method, and then the off-design performance simulation model is constructed by the mass flow matching and the work matching between components. The model is developed using SIMULINK, which has advantages of easy steady-stare and dynamic modelling and user friendly interface function. It is found that the off-design performance analysis results using the proposed model are well agreed with the performance analysis results by GASTURB at various operating conditions.

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A Study on Fault Detection of Off-design Performance for Smart UAV Propulsion System (스마트 무인기용 가스터빈 엔진의 탈설계 영역 구성품 손상 진단에 관한 연구)

  • Kong, Chang-Duk;Kho, Seong-Hee;Choi, In-Soo;Lee, Seung-Heon;Lee, Chang-Ho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2007.04a
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    • pp.245-249
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    • 2007
  • In this study a model-based diagnostic method using the Neural Network was proposed for PW206C turbo shaft engine and performance model was developed by SIMULINK. Fault and test database to build the NN was obtained at various off-design operating range such as flight altitude, flight Mach number and gas generator rotational speed variation. According to the fault detection analysis results, it was confirmed that the proposed fault detection method could find well the fault of compressor, compressor turbine and power turbine at on-design point as well as off-design point conditions.

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A Study on fault Detection of Off-design Performance for Smart UAV Propulsion System (스마트 무인기용 가스터빈 엔진의 탈설계 영역 구성품 손상 진단에 관한 연구)

  • Kong, Chang-Duk;Kho, Seong-Hee;Ki, Ja-Young;Lee, Chang-Ho
    • Journal of the Korean Society of Propulsion Engineers
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    • v.11 no.3
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    • pp.29-34
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    • 2007
  • In this study a model-based diagnostic method using the Neural Network was proposed for PW206C turbo shaft engine and performance model was developed by SIMULINK. Fault and test database to build the NN was obtained at various off-design operating range such as flight altitude, flight Mach number and gas generator rotational speed variation. According to the fault detection analysis results, it was confirmed that the proposed fault detection method could find well the fault of compressor, compressor turbine and power turbine at on-design point as well as off-design point conditions.

Study on Component Map Scaling Technique Using a Gas Turbine Test Unit (가스터빈 시험장치를 이용한 구성품 성능선도 축척기법에 관한 연구)

  • 공창덕;고성희;기자영
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2003.05a
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    • pp.105-109
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    • 2003
  • A new scaling method for the prediction of gas turbine components characteristics using experimental data of gas turbine test unit has been proposed. In order to minimize the analyzed performance error in the this study, firstly component maps were constructed by real experimental performance data at some operating conditions and a polynomial obtained from scaling factors at given conditions, and then the simulated performance using the identified maps was compared with the performance result using the currently used traditional scaling method. In comparison, the performance analysis result by the currently used traditional scaling method was met well agreed with the real engine performance at most off-design points except for the design point. However the performance analysis result using the newly proposed scaling method had good agreement with the experimental results within maximum 5% error.

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Off-design Performance Characteristics of SOFC-GT Hybrid System Operating with Syngas Fuel (합성가스를 연료로 사용하는 고체산화물연료전지-가스터빈 하이브리드 시스템의 탈설계점 성능 특성)

  • Choi, Jung-Il;Sohn, Jeong-Lak;Song, Seung-Jin;Kim, Tong-Seop
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.34 no.3
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    • pp.269-274
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    • 2010
  • As a preliminary study on a SOFC-GT hybrid system integrated a with coal-gasification system, the influence of the concentrations of $H_2$ and CO in syngas on the performance characteristics of the hybrid system is investigated. It is expected that the differences in the heating values of fuels with different compositions trigger the off-design operation of the gas turbine and result in different performance characteristics of the overall hybrid system. Syngas compositions are found to affect the SOFC performance. Performance of hybrid system with carbon monoxide is poorer than the case with hydrogen. In the case of part-load performance with syngas, performance degradation at part-load operating conditions with hydrogen is more dominant than the case with carbon monoxide.