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RISS 인기검색어
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- 저자 : ( Yei-chin Chao ) (검색결과 2 건)
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Detonation transmission with an abrupt change in area
Hsu, Yao-Chung,Chao, Yei-Chin,Chung, Kung-Ming Techno-Press 2018 Advances in aircraft and spacecraft science Vol.5 No.5
Detonation transmission between propane/oxygen (donor) and propane/air (acceptor) with an abrupt area change is experimentally studied. In the donor, there are two types of incident detonation waves: A self-sustained Chapman-Jouguet (CJ) detonation wave and an overdriven detonation wave that is a result of the difference in the initial donor pressure ratios. The piston work is used to characterize the strength of the incident detonation wave. For an incident CJ detonation wave, the re-initiation of a detonation wave in the acceptor depends on the initial pressure in the donor and the expansion ratio. The axisymmetric and non-axisymmetric soot patterns respectively correspond to direct detonation and detonation re-initiation. For an incident overdriven detonation wave, the re-initiation of a detonation wave in the acceptor strongly depends on the degree of overdrive.
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Spray Combustion Characteristics of De-asphalted oil (DAO)
( Krishna Ahuja ),( Li Yueh-heng ),( Guan-bang Chen ),( Yei-chin Chao ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
In this research, the DAO is used to investigate the droplet and spray combustion characteristics to improve the combustion efficiency of the gas turbine combustor. This research consists of experiments such as TGA, single suspended droplet experiment, gas emission system and chemiluminescence CH<sup>*</sup>, C<sub>2</sub><sup>*</sup> were used to characteristics the fuel properties. The single suspended droplet experiment is used to investigate the evaporation behaviors of the single droplet in a stationary motion at three different high ambient temperatures. Increasing the ambient temperature will increase the speed of evaporation, intensity of the micro-explosions and bubbling, and reduce the initial heating period of the droplet and droplet lifetime. The single suspended droplet experiment of DAO results showed that some admiring phenomena were founded such as, expansion, micro-explosion, ejection, bubbling, char formation, and char ignition. In DAO, evaporation observed without char formation. Experiments are conducted in an atmospheric pressure burner with an air-atomized injector and swirling primary air around it to replicate typical features of a gas turbine combustor. Experiments were conducted for fixed air and fuel flow rates, while the airflow split between the injector and the co flow swirler was varied. Results show a significant reduction in emissions as the fraction of total air fed into the atomizer is increased. Blue flames, reminiscent of premixed combustion, and low emissions of nitric oxides and carbon monoxide were observed for all DAO.
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