50KW 터보제너레이터용 가스터빈 엔진의 설계점/ 탈설계/과도성능해석

김수용,박무룡,조수용,Kim, Su-Yong,Park, Mu-Ryong,Jo, Su-Yong 한국기계연구원 1997 硏究論文集 Vol.27 No.-

Present paper describes on/off design performance of a 50KW turbogenerator gas turbine engine for hybrid vehicle application. For optimum design point selection, relevant parameter study is carried out. The turbogenerator gas turbine engine for a hybrid vehicle is expected to be designed for maximum fuel economy, ultra low emissions, and very low cost. Compressor, combustor, turbine, and permanent-magnet generator will be mounted on a single high speed (82,000 rpm) shaft that will be supported on air bearings. As the generator is built into the shaft, gearbox and other moving parts become unnecessary and thus will increase the system's reliability and reduce the manufacturing cost. The engine has a radial compressor and turbine with design point pressure ratio of 4.0. This pressure ratio was set based on calculation of specific fuel consumption and specific power variation with pressure ratio. For the given turbine inlet temperature, a rather conservative value of $1100^\circK$ was selected. Designed mass flow rate was 0.5 kg/sec. Parametric study of the cycle indicates that specific work and efficiency increase at a given pressure ratio and turbine inlet temperature. Off design analysis shows that the gas turbine system reaches self operating condition at N/$N_{DP}$ = 0.53. Bleeding air for turbine stator cooling is omitted considering low TIT and for a simple geometric structure. Various engine performance simulations including, ambient temperature influence, surging at part load condition. Transient analysis were performed to secure the optimum engine operating characteristics. Surge margin throughout the performance analysis were maintained to be over 80% approximately. Validation of present results are yet to be seen as the performance tests are scheduled by the end of 1998 for comparison.

74 KW급 터보축 싸이클 산업용 가스터빈 엔진의 성능 예측

김수용,윤의수,조수용,오군섭,Kim, Su-Yong,Yun, Ui-Su,Jo, Su-Yong,O, Gun-Seop 한국기계연구원 1996 硏究論文集 Vol.26 No.-

Present paper describes on/off design performance analysis of an 74KW industrial turboshaft gasturbine engine. Procedures to match between the compressor, combustor and turbine have been incorporated into the developed program satisfying compatibility requirement of flow and work and ratational speed. The validity of the performance results from the developed program are yet to be proved through performance experiments of the resultant engine, but comparison of the present results with those from "GASCAN(Thermoflow:America) under similar mass inlet flow, pressure ratio, and speed condition show good agreement despite present results underpredict 6-10% for power and up to 3% in efficiency, respectively.

산업용 가스터빈 엔진(FT4000계열)의 개발 현황

김수용,박무룡,Kim, Su-Yong,Park, Mu-Ryong 재료연구소 1995 機械와 材料 Vol.7 No.3

양계업을 바라보는 기자의 시각 - 양계업발전을 위한 가금단체의 역할

김수용,Kim, Su-Yong 대한양계협회 2015 월간 양계 Vol.47 No.1

SOFC-GT에 의한 차세대 발전 기술 개발

김수용,박무룡,Kim, Su-Yong,Park, Mu-Ryong 재료연구소 2001 機械와 材料 Vol.13 No.1

축산계열화법.축산업허가제 집중 탐구 - 축산계열화법, 2월 23일 본격 시행

김수용,Kim, Su-Yong 한국육계협회 2013 월간 닭고기 Vol.19 No.2

Performance Analysis of an Inert Gas Generator for Fire Extinguishing

김수용,Kim, Su-Yong,Arkadiy F. Slitenko 한국기계연구원 1999 硏究論文集 Vol.29 No.-

Present study deals with performance analysis of an inert gas generator (IGG) which is to be used as an effective mean to suppress the fire. The IGG uses a turbo jet cycle gas turbine engine to generate inert gas for fire extinguishing. It is generally known that a lesser degree of oxygen content in the product of combustion will increase the effectiveness of fire suppressing. An inert gas generator system with water injection will bring advantages of suffocating and cooling effects which are considered as vital factors for fire extinguishing. As the inert gas is injected to the burning site, it lowers the oxygen content of the air surrounding the flame as well as reduces the temperature around the fire as the vapour in the inert gas evaporates during the time of spreading. Some important aspects of influencing parameters, such as, air excess coefficient. $\alpha$, compressor pressure ratio, $ pi_c$, air temperature before combustion chamber, $T_2$, gas temperature after combustion chamber, $T_3$, mass flow rate of water injection, $M_w$, etc., on the performance of IGG system are investigated. Calculations of total amount of water needed to reduce the turbine exit temperature to pre-set nozzle exit temperature employing a heat exchanger were made to compare the economics of the system. A heat exchanger with two step cooling by water and steam is considered to be better than water cooling only. Computer programs were developed to perform the cycle analysis of the IGG system and heat exchanger considered in the present study.

비활성 가스제너레이터를 이용한 화재 진압 기술

김수용,Kim, Su-Yong 재료연구소 1999 機械와 材料 Vol.11 No.1

2압, 증기분사 복합발전 사이클에 대한 성능해석

김수용,손호재,박무룡,윤의수,Kim, Su-Yong,Son, Ho-Jae,Park, Mu-Ryong,Yun, Ui-Su 한국기계연구원 1997 硏究論文集 Vol.27 No.-

Combined cycle power plant is a system where a gas turbine or steam turbine is used to produce shaft power to drive a generator for producing electrical power and the steam from the HRSG is expanded in a steam turbine for additional shaft power. Combined cycle plant is a one from of cogeneration. The temperature of the exhaust gases from a gas turbine ranges from $400^\circC$ to $600^\circC$, and can be used effectively in a heat recovery steam generator to produce steam. Combined cycle can be classed as a "topping(gas turbine)" and a "bottoming(steam turbine)" cycle. The first cycle, to which most of the heat is supplied, is called the topping cycle. The wasted heat it produces is then utilized in a second process which operates at a lower temperature level and is therefore referred to as a "bottoming cycle". The combination of gas/steam turbine power plant managed to be accepted widely because, first, each individual system has already proven themselves in power plants with a single cycle, therefore, the development costs are low. Secondly, the air as a working medium is relatively non-problematic and inexpensive and can be used in gas turbines at an elevated temperature level over $1000^\circC$. The steam process uses water, which is likewise inexpensive and widely available, but better suited for the medium and low temperature ranges. It, therefore, is quite reasonable to use the steam process for the bottoming cycle. Only recently gas turbines attained inlet temperature that make it possible to design a highly efficient combined cycle. In the present study, performance analysis of a dual pressure combined-cycle power plant is carried out to investigate the influence of topping cycle to combined cycle performance.

개입모형을 이용한 한국의 입출국자 수의 분석

김수용,성병찬,Kim, Su-Yong,Seong, Byeong-Chan 한국통계학회 2011 응용통계연구 Vol.24 No.5

This study analyzes inbound and outbound Korea tourism data through an intervention model. For the analysis, we adopt three intervention factors: (1) IMF bailout crisis in December 1997, (2) Severe Acute Respiratory Syndrome(SARS) outbreak in March 2003, and (3) Lehman Brothers bankruptcy in September 2008. The empirical results show that only the SARS factor lowered inbound tourism from April 2003 with a drastic decline in May 2003 and gradually decaying since then. However, all three factors significantly lowered tourism in the case of outbound tourism. Especially, the effect of the IMF is shown to be permanent from December 1997 and the effects of SARS and the Lehman Brothers bankruptcy abrupt and temporary with a gradual decay. 본 논문에서는 개입모형(intervention model)을 이용하여 한국의 입출국자 시계열 자료를 분석한다. 개입분석을 위하여 1997년 12월의 IMF 구제금융사건, 2003년의 3월의 SARS 발생, 그리고 2008년의 9월의 리먼브라더스 사태를 개입변수로 고려하였다. 그 결과, 한국의 총 입국자 수에는 SARS 개입변수만이 2003년 4월부터 영향을 미치기 시작하여 2003년 5월부터 급격하게 감소하는 영향을 미친 것으로 나타났다. 반면, 한국의 총 출국자 수에는 모든 3가지 개입의 효과가 유의하게 나타났으며 특히 IMF 개입변수는 1997년 12월부터 영구적인 영향을 미친 것으로 보이며 SARS 및 리먼브라더스 개입변수는 점차로 감소하는 영향을 미친 것으로 나타났다.