• Transactions of the Korean Society of Mechanical Engineers B
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• v.37 no.11
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• pp.1015-1022
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• 2013

This study simulates the operation of a 200 kW class micro gas turbine that is currently under development. The performance and operating characteristics depending on the load control scheme (constant turbine inlet temperature versus constant turbine exit temperature) and ambient condition were investigated using detailed component performance data. The sensitivities of operating parameters, such as the compressor surge margin and flow path temperatures, according to unit fuel flow change were predicted for a wide load range. The sensitivity analysis showed that the steady state calculation provided useful information about the maximum surge margin reduction during load change.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1707_1708
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• 2009

Unit master control(UMC)는 발전소의 요구 부하신호를 설정하는 최상위의 제어레벨이며 UMC의 설정값은 자동급전 지령신호(Automatic Dispatch System : ADS) 또는 운전원이 설정하는 값에 따라 보일러 및 터빈 Master에 Unit 요구 신호를 출력하여 하위제어 레벨인 공기, 연료, 급수 등을 조절할 수 있는 기기에 Unit 부하 요구 신호(Unit Load Demand : ULD)에 따라 제어 되도록 하는 방법으로서, Unit 목표부하 설정, Unit 목표부하 상/하한 제한, 목표부하 변화율 제한, 주파수 보정, Runback/Rundown/ Runup, 보일러 및 터빈 Demand 신호생성의 기능을 가지고 있다.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.32 no.11
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• pp.26-31
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• 2003

가스터빈/연료전지 혼합형 발전시스템은 고온형 연료전지 발전시스템의 산화제(공기) 공급부가 마이크로터빈으로 대체되어 고온고압의 공기가 연료전지로 공급되고 연료전지의 반응가스가 터빈을 구동하여 두 시스템이 동시에 서로 다른 방식으로 전력을 생산하는 시스템을 의미한다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.1068-1071
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• 2017

The turbine exhaust system consists of a turbine flange, heat exchanger, exhaust duct and thrust nozzle. Heat exchanger is used for the launch vehicle because of the advantage of reducing the weight of the helium gas and the storage tank by using the heat exchanger pressurization method compared to the cold gas pressurizing method. Since the gas generator is combusted in fuel-rich condition, the soot is contained in the combustion gas. Hence, the heat exchanger should be designed considering the reduction of the heat exchange efficiency due to the soot effect. In addition, the uncertainty of the heat exchange calculation and the evaluation of the influence of the combustion gas soot on the heat exchange can not be completely calculated, so the design requirements must include a structure that can guarantee and control the temperature of the heat exchanger outlet. In this paper, it is described that the component allocation, the design method considering the manufacture of internal structure, the advantages of new concept of nozzle design.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.39 no.4
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• pp.371-378
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• 2015

Range extenders, which are power generation systems driven by small engines, extend the driving distance and time of electric vehicles (EVs) through continuous charging of batteries. The currently used range extenders with gasoline engines pose limitations with regard to the realization of high-power compact systems, owing to their complex structure and low energy density. In contrast, micro gas turbine (MGT) range extenders (MGT power packs) possess high power and low weight, and can therefore be significantly reduced in size despite increase in speed. In this study, an MGT power pack for the range extenders of EVs was developed using a turbo-prop micro turbine, an alternator for passenger vehicles and electric batteries. The operating characteristics of the MGT power pack were measured through a series of experiments conducted under electrical no-load and load conditions. Their power generation performance and efficiency were measured under various electrical loads and power transmission gear ratios. From the results, electrical load was found to have no influence on power generation performance. The maximum electrical power output was 0.8 kW at a core turbine speed of 150 krpm, and the application of 3:1 reduction gear to the turbine output shaft increased the power to 1.5 kW by 88%. This implies that the test results demonstrated stable power generation performance of the MGT power pack regardless of vehicle load changes, thus revealing its feasibility for use with the range extenders of EVs.

• Journal of Energy Engineering
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• v.17 no.3
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• pp.161-166
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• 2008

The purpose of this study is to apprehend the behavior of exhaust gas flow from gas turbine during part load operation in Heat Recovery Steam Generator. As a first step of this work, internal flow characteristics according to HRSG types were examined by CFD analysis. Next step, tube temperature according to gas turbine 53% and 100% load conditions were calculated by results of CFD and those were compared with temperature data gathered from real plant. Finally, thermal performance due to part load operation was calculated to estimate the influence of heat transfer in superheater. In addition, new type of device is suggested to eliminate the uneven temperature distribution of tubes during part load operation.

• Plant Journal
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• v.18 no.2
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• pp.32-40
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• 2022

In this study, we investigated the operation data of combined heat and power in accordance with the change of the inlet guide vane with partial load. The partial load 80% could close the inlet guide vane up to 24%, and the exhaust gas temperature could be increased by 52℃. The partial load 90% could close the inlet guide vane up to 12%, and the exhaust gas temperature could be increased by 23℃. At 80% of partial load with the thermal load tracking mode, the output could be increased up to 5.68 MW, the combined cycle efficiency increased by 0.73%, and the combined heat and power efficiency increased by 1.81%. At 90% of the partial load, the output could be increased up to 2.55 MW, the combined cycle efficiency increased by 0.32%, and the combined heat and power efficiency increased by 0.72%.

• Journal of Energy Engineering
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• v.4 no.3
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• pp.402-406
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• 1995

다리우스 풍력터빈의 속도설정을 터빈이 만드는 토크와 발전기가 요구하는 토크의 \평형을 통해 찾아 낼 수 있음을 검토하였다. 풍속에 따른 속도-토크곡선에서 일정충력곡선이 만나는 점이 터빈의 동작점으로 되며 이는 안정 및 불안정이 될 수도 있다. 풍속과 출력이 각각 변할 때 이 동작점이 어떻게 이동되는가 하는 점을 제시하였다. 또한 터빈의 속도에 관한 제어 블록선도를 제시하여 그 출력변화에 따른 속도변화의 전달함수를 알아내고 이의 형태는 1차 시지연 함수로 유도된다.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06d
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• pp.440-443
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• 2010

차세대 청정에너지로서의 풍력발전 보급이 급속히 증가하고 있다. 고 효율의 풍력발전이 요구됨에 다라 풍력터빈이 대형화 되면서 풍력터빈의 경제 수명 보장과 발전 효율을 극대화하기 위해 제어기술의 중요성이 더욱 부각되고 있다. 거대 구조물인 풍력터빈의 기계적 부하를 최소화하고, 바람 상태에 따른 고 효율출력 제어가 필수적인 것만큼 제어장치의 궁극적인 목표는 바람으로부터의 에너지 획득 비용을 줄이는 것이라고 할 수 있다. 본고에서는 에너지 변환장치로서의 풍력터빈이 갖는 제어 장치의 기본 기능을 설명하고, 이에 대한 실현에 대하여 논한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.12
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• pp.76-82
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• 2005

An experimental study on an axial-type micro turbine which consists of maximum 6 stages is conducted to measure aerodynamic characteristics on each stage. This turbine has a 2.0 flow coefficient, 3.25 loading coefficient and 25.8mm mean diameter. The solidity of stators and rotors is within a 0.67~0.75, and the off-design performance is measured by changing the load after adjusting the mass flowrate and the total pressure to constant at inlet. A maximum specific output power of 2kW/kg/sec is obtained in one stage, but the increment of the specific output power with increasing stages is alleviated. In case of torque, the increment of the torque maintains to constant at low RPM region, but its increment become dull at high RPM region. The efficiency of the micro turbine becomes low because the tip gap effect is great due to the small blade, but it could be improved by increasing the stages.