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RISS 인기검색어
- 검색키워드
- 저자 : Colban, W.F. (검색결과 4 건)
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오승묵(Seungmook Oh),Wiil F. Colban,Paul C. Miles 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The cycle-to-cycle variability and potential sources of unburned hydrocarbon (UHC) emissions are examined in a single-cylinder, light-duty diesel test engine operating in low-temperature combustion regimes. A fast flame ionization detector (FID) was employed to examine both cycle-to-cycle emissions behavior. A standard suite of emissions measurements, including CO, CO₂, NOx and soot, was also obtained. Measurements were made spanning a broad range of intake O₂ concentrations-to examine the UHC behavior of dilution-controlled combustion regimes-and spanning a broad range of injection timings-to clarify the behavior of increased UHC emissions in late-injection combustion regimes. Both low- and moderate-loads were investigated. The cycle-resolved UHC data showed that the coefficient of variation of single-cycle UHC did not increase with increases in UHC emissions as either O₂ concentration or injection timing was varied. Additionally, the crank-angle-resolved UHC measurements were coupled with a I-D engine model to examine the variation of exhaust mass flow rate of UHC within each cycle. The results showed that most of the UHC mass exited the cylinder during the latter part of the exhaust process, and that UHCs originating from cylinder wall and piston top quench layers are likely of greater importance than UHCs emitted from quench layers along the head.
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고온고압 조건에서 Two-Photon LIF를 이용한 CO 측정에 관한 연구
Oh, Seung-Mook,Kim, Duk-Sang,Miles, Paul C.,Colban, Will F. 한국연소학회 2007 한국연소학회지 Vol.12 No.4
Carbon monoxide (CO) is not only an important intermediate species in chemical reaction mechanisms of hydrocarbon fuel combustion, but also a crucial pollutant species emitted from automotive engines. To better understand the physical processes impacting CO emissions, the development of laser-based measurement techniques that can visualize in-cylinder CO distributions is desirable. Among these techniques, Laser-Induced Fluorescence (LIF) is a sensitive and species-selective detection technique capable of good spatial resolution. However, some technical matters such as deep UV excitation, severe pressure dependency of the LIF signal, and potential interference from other species have been major challenges for CO LIF application. This study is focused on investigating the feasibility of CO two-photon LIF in a direct-injection diesel engine operating at typical pressure and temperature conditions with commercial grade diesel fuel. Spectroscopic analysis shows that the CO fluorescence signal can be separated from $C_2$ Swan band or broadband fluorescence from PAHs when the signal is collected near 483 nm. The signal-to-noise ratio of CO LIF deteriorate rapidly as pressure is increased, following $P^{-1.49}$ which matches the theoretical signal pressure dependency.
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고온고압 조건에서 Two-Photon LIF를 이용한 CO 측정에 관한 연구
오승묵(Seungmook Oh),김득상(Duksang Kim),Paul C. Miles,Will F. Colban 한국연소학회 2007 한국연소학회지 Vol.12 No.4
Carbon monoxide (CO) is not only an important intermediate species in chemical reaction mechanisms of hydrocarbon fuel combustion, but also a crucial pollutant species emitted from automotive engines. To better understand the physical processes impacting CO emissions, the development of laser-based measurement techniques that can visualize in-cylinder CO distributions is desirable. Among these techniques, Laser-Induced Fluorescence (LIF) is a sensitive and species-selective detection technique capable of good spatial resolution. However, some technical matters such as deep UV excitation, severe pressure dependency of the LIF signal, and potential interference from other species have been major challenges for CO LIF application. This study is focused on investigating the feasibility of CO two-photon LIF in a direct-injection diesel engine operating at typical pressure and temperature conditions with commercial grade diesel fuel. Spectroscopic analysis shows that the CO fluorescence signal can be separated from C₂ Swan band or broadband fluorescence from PAHs when the signal is collected near 483 nm. The signal-to-noise ratio of CO LIF deteriorate rapidly as pressure is increased, following P<SUP>-1.49</SUP> which matches the theoretical signal pressure dependency.
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