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대형가스터빈용 단일 압력 선회식 연료분사기의 분무 특성 및 성능 평가
석정민(Jungmin Seok),정한진(Hanjin Jeong),최인찬(Inchan Choi),김재호(Jaiho Kim),이상훈(Sanghoon Lee) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
대형 가스터빈 연소기 구성품인 단일 압력선회식 연료분사기(Pressure swirl simplex liquid injector)를 설계, 분무특성 및 성능을 시험을 통해 평가하였다. 공급 압력 대비 분무 유량을 측정하여 설계점 기준 분무유량과 비교하였으며 섀도우그래프(Shadowgraph)를 통해 분무가시화이미지를 기록, 분무의 형상을 정성적으로 파악하고 분무각을 측정하였다. 시험 결과 동일한 공급압력 대비 측정된 분무 유량은 설계점 기준 유량과 거의 일치하여 설계 및 제작의 정합성이 확인되었으며 섀도우그래프 이미지를 통해 연료분사기의 분무형상을 파악하고 설계 의도된 분무각이 나타남을 확인할 수 있었다. 이를 기반으로 향후 PDA(Phase Doppler Anemometry)를 통한 분무측정을 통해 보다 구체적인 연료분사기의 분무 성능 및 특성을 파악할 수 있을 것으로 기대된다. As a component development of heavy duty industrial gas turbine combustor development program, pressure swirl simplex injector was designed and tested to figure out spray characteristics and performance. Injector flow rate as a function of pressure drop was measured and compared to the design target. Also spray shape was analyzed qualitatively and spray cone angle was measured from spray visualization image using shadowgraph. The flow test result showed that the injector was designed and manufactured correctly according to the design target and spray cone angle was measured from shadowgraph result. As a next step, PDA (Phase Doppler Anemometry) measurement is planned to figure out more specific spray performance and characterization.
확산 포집에 따른 Metal fiber filter의 포집 온도별 필터링 특성 고찰
석정민(Jungmin Seok),전광민(Kwang Min Chun),송순호(Soonho Song),이세영(Seyoung Lee) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Soot particle deposition behavior of metal fiber filter has been studied with pressure drop and particle number concentration based filtration efficiency measured by SMPS. The filter type of TWP (Thin Web Pad) was applied to the study, with mean pore size of 18μm, and unit weight of 1.0 kg/m2. 3 deposition temperature range was set as 150℃, 250℃, 400℃, to examine the effect of particle approach velocity as a function of deposition temperature (equivalent to an approach velocity of 1.4 m/s, 1.7 m/s, and 2.2 m/s, respectively). Particles were generated by soot generator, with mode diameter of 85 nm and total number concentration of 3.69 x 1010/cm3. Total flow rate was 29.23 sLPM, and deposition time was 1h. The result showed that the initial pressure drop showed an increase in proportion to the deposition temperature, but filtration efficiency showed different tendency; inversely proportional to the temperature. This tendency was resulted from the pressure drop is a function of temperature, but number concentration based filtration efficiency was inversely proportional to the temperature, when particle diffusion is the dominant deposition mechanism in filtration process.