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RISS 인기검색어
- 검색키워드
- 저자 : Menglei Zheng (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Surface Dielectric Barrier Discharge for Generating Negative Oxygen Ions
Menglei Zheng,Wei Wei,Xinhong Chen,Hui Wang,Guangxun Yu,Jae-Ou Chae 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, two types of surface dielectric barrier discharge (DBD) reactors were examined at the conditions of 4.24 ㎸ and 356 ㎐, in order to find out the effect of different reactor configurations on producing negative oxygen ions. And the results showed that the ideal configuration of surface DBD reactor should be with external tips on its electrode. In the following step, the electrical properties of surface dielectric barrier discharge in atmosphere pressure have been investigated experimentally by changing duty ratio from 25% to 50% but keeping operation voltage and frequency in constant. The results indicated that the surface DBD reactor showed better characteristics for generation of negative oxygen ions when duty ratio was 50%.
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Electronic Turbo Timer Design for Automobile
Menglei Zheng,Wei Wei,Sang-won Han,Jae-Ou Chae 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Nowadays, many cars are installed superchargers in order to produce more power. And turbochargers are relatively compact, lightweight and efficient but suffer from heat stress, Especially, the engine is shut off immediately after driving a period time, which will burn the lubricating oil under at high speed rotating and make the charger wear without oil lubrication. So it is important to let the engine run at idle speed for a few minutes after it is switch off, allowing the compressor assembly to run down in speed and cool the excess heat. A turbo timer is an electronic device designed to keep an automotive engine running for a pre-setting period of time in order to automatically execute the cool-down period required to prevent turbo wear. And this turbo timer can be set by manual from I minute to 9 minutes to delay shut off the engine. Furthermore, this device also can get speed signals and fuel injection signals from ECU and display instantaneous fuel efficiency (㎞/l) on LED directing drivers to gain lower fuel consumption and relative high engine performance.
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A Study on Generation of Negative Oxygen Ions Using Surface Dielectric Barrier Discharge
Jae-Ou Chae(채재우),Menglei Zheng(정맹뢰),Wei Wei(위위),Xinhong Chen(진신홍),Hui Wang(왕혜),Yong-Hwan Kwak(곽용환) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Nowadays, ionizers are used very popular for producing negative oxygen ions, which is good for human being health. However, most of the ionizers in the present market are using needle-plate structure in which corona discharge occurs. Comparing with corona discharge, surface discharge is much more compact in the configuration and produces less ozone. For the purpose of finding out the best reactor structure, four types of surface dielectric barrier discharge (DBD) reactors were examined to produce negative oxygen ions at the conditions of 4.24 ㎸ and 356 ㎐. Then influence of frequency (50 ㎐ to 400 ㎐) on the performance of this reactor was also examined on keeping operation voltage and waveform in constant. The results indicated that the surface DBD reactor showed better characteristics for generation of negative oxygen ions when frequency was between 100 ㎐ and 200 ㎐.
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Experiment study on hydrogen-rich gas generation using non-thermal plasma
왕혜(Hui Wang),위위(Wei Wei),정맹뢰(MengLei Zheng),채재우(Jae-Ou Chae),유광훈(GuangXun Yu) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This is a report of a feasibility study on the reduction of harmful substances such as particulate matters and nitric oxides emitted from diesel engines by using a plasma reforming system that can generate hydrogen-rich gas. In this paper, an exhaust reduction mechanism of the non-thermal plasma reaction was investigated to perform its efficiency and characteristics on producing hydrogen-rich gas. Firstly, we explain briefly the chemistry of hydrocarbon reforming. The experimental system is showed in the second part. Finally, we demonstrate the feasibility of producing hydrogen using non-thermal plasma. The experimental results are focused on the influence of the different operating parameters (air ratio, inlet flow rates, voltage) on the reformer efficiency and the composition of the produced gas.
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A Development of Automatically Control of Hazard Lamps of Automobiles
Wei Wei(위위),Jae-ou Chae(채재우),Menglei Zheng(정맹뢰),Ju-Hyen Sim(심주현),Hui Wang(왕혜),Guangxun Yu(유광훈) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Nowadays, with the increasing number of automobiles, there are more and more traffic accidents. Even though with many safety devices installed, careless and inexperienced drivers often fail to take uses of advanced technologies built in the devices. One type of unfortunate and avoidable traffic accidents is when drivers in an emergency situation either forget or have no time to turn on the hazard lamps which play an important role in noticing other drivers to pay their attentions, in the result, a great number of follow-up-accidents happened. We have developed a system that is capable to keep trucking the condition of the automobile, and turn on the hazard lamps automatically when an emergency has occurred. The system is reliable, cheap, and no design changes required for the automobile.
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