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김호근(Ho-Keun Kim),이상민(Sang-Min Lee),김한석(Han-Seok Kim),안국영(Kook-Young Ahn),김용모(Yong-Mo Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The Flame length of CH₄ with the Oxidizer of air and O₂ has been measured respectively for the nozzle diameter of 1.6㎜, 2.7㎜, 4.4㎜ and 7.7㎜. In all CH₄ flame on oxidizer of air and O₂, the flame length was independent of the initial jet diameter, dependent only on the flowrate in laminar flame regime, and in turbulent flame dependent on the initial jet diameter. Using correlation equation of Dellchatslos, the flame length has been expected exactly for CH₄/air flame, but has been underestimated for CH₄/O₂ flame. This paper has proposed correlation equation of CH₄/O₂ flame.
김호근(Ho-Keun Kim),한지웅(Ji-Woong Han),김한석(Han-Seok Kim),안국영(Kook-Young Ahn) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
An experimental investigation on the characteristics of nitrogen oxide emission from swirling was conducted using multi air staged combustor. The combustor utilizes swirler to dampen fuel/air mixing, allowing an extended residence time for fuel conversion chemistry in an locally fuel-rich environment prior to burnout. This process also allow to reduce thermal NOx formation to lessen the temperature of reaction zone.<br/> Parametric studies of ratios of each staged air were carried out the feasibility of fuel/air mixing for low NOx combustion. This study is validated to reduce NOx. suppressing to be supplied air in multi air staged combustion.
김호근(Ho Keun Kim),임지혁(Ji-Hyuk Im),전재철(Jaechul Chun),안윤호(Yunho An),최진훈(Jinhoon Choe) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
The combustion characteristic of 5㎿ class gas turbine engine with varying biogas concentration has been investigated at different engine operation regimes. The test was carried out in the gas turbine combustor test facility at Doosan Heavy Industries & Construction Co., Ltd. The results show that NOx emissions decreases with reduction in CH₄ concentration. However, CO emission results show the opposite trend compared with those of NOx emissions. In overall, the performance test result of the designed biogas combustor was considered successful satisfying the design targets.
텔레메트리 시스템을 위한 가변 컷 오프 주파수 및 가변 샘플 레이트 저면적 다채널 디지털 필터 설계
김호근 ( Ho-keun Kim ),김종국 ( Jong-guk Kim ),김복기 ( Bok-ki Kim ),이남식 ( Nam-sik Lee ) 한국항행학회 2021 韓國航行學會論文誌 Vol.25 No.5
본 논문에서는 텔레메트리 시스템을 위한 가변 컷 오프 주파수 및 가변 샘플레이트 특성을 지니는 저면적 다채널 디지털 필터 구조를 제안한다. 제안하는 디지털 필터는 임의의 컷 비율에 대해 필터 뱅크의 추가적인 설계 없이 컷 오프 주파수와 샘플레이트를 가변적으로 사용할 수 있는 필터 뱅크를 구현함으로써 하드웨어 면적을 줄일 수 있었다. 또한, 멀티플렉서 (MUX; Multiplexer) 컨트롤을 통해 통과하는 필터의 개수에 따라 샘플레이트를 가변적으로 선택할 수 있는 구조를 제안한다. 제안하는 디지털 필터는 Quartus의 FIR (finite impulse response) IP (intellectual property)의 TDM (time division multiplexing)을 이용함으로써, TDM을 사용하지 않았을 때보다 면적이 큰 DSP (digital signal processing) 블록을 80개에서 1개로 줄일 수 있었다. Kaiser 창 함수를 이용하여 Matlab을 통해 필터의 차수와 계수를 계산하였으며, VHDL (very high speed integrated circuits hardware description language)을 통해 하드웨어로 구현하였다. 텔레메트리 시스템에 적용 후, 실험 결과를 통해 제안하는 디지털 필터가 정상적으로 동작하고 있음을 확인하였다. In this paper, We propose variable cut-off frequency and variable sample rate small-area multi-channel digital filter for telemetry system. Proposed digital filter reduced hardware area by implementing filter banks that can variably use cut-off frequency and sample rate without additional filter banks for an arbitrary cut ratio. In addition, We propose the architecture in which sample rate can variably be selected according to the number of filters that pass through the multiplexer control. By using time division multiplexing (TDM) supported by the finite impulse response (FIR) intellectual property (IP) of Quartus, the proposed digital filter can greatly reduce digital signal processing (DSP) blocks from 80 to 1 compared without TDM. Proposed digital filter calculated order and coefficients using Kaiser window function in Matlab, and implemented using very high speed integrated circuits hardware descryption language (VHDL). After applying to the telemetry system, we confirmed that the proposed digital filter was operating through the experimental results in the test environment.
산화제 입구 속도에 따른 0.2㎿ 순산소 연소기의 NO 배출 특성
김호근(Ho Keun Kim),이상민(Sang Min Lee),안국영(Kook Young Ahn),김용모(Yongmo Kim) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
Effects of oxidizer inlet velocity on NO emission characteristics of 0.2㎿ oxy-fuel combustor have been experimentally investigated. The NO formation process in the oxy-fuel combustion is extremely sensitive even for the small fraction of nitrogen in oxidizer. By increasing the oxidizer velocity, flame length is reduced due to the enhanced turbulent mixing. The increased oxidizer velocity also results in the decreased flame temperature through the elevated entrainment rate of the recirculated product and the corresponding NO emission is drastically decreased. Experimental results clearly indicate that the entrained product gases play a crucial role to decrease the temperature at the flame zone and the post flame zone where the thermal NO is mainly formed.