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정종수,이교우,고범승,강경태,Jurng, Jongsoo,Lee, Gyo-Woo,Ko, Bum-Seung,Kang, Kyung-tae 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.11
An experimental study on a double-concentric diffusion flame(DDF) has been carried on in order to Investigate the characteristics of soot formation compared to a normal coflow diffusion flame(NDF). Laser extinction technique has been used for an ethylene($C_2H_4$) and air flame with various flow rates. Soot formation In the double-concentric diffusion flame was enhanced by the inner inverse diffusion flame due to the increase in flame temperature and also suppressed due to the nitrogen-dilution from the inner air. Soot concentration at the flame axis of DDF was higher than that of the NDF, mainly because of the increase of temperature by inner flame. However, the maximum soot volume fraction of DDF was lower than NDF at the outer side of the flame, mainly due to the effect of nitrogen-dilution from the inner air.
[論文] 自動車用 라디에이터의 放熱性能設計에 관한 硏究(Ⅰ)放熱性能의 解析
정종수(Jongsoo Jurng),이춘식(Chun Sik Lee) 한국자동차공학회 1989 오토저널 Vol.11 No.5
A method for analyzing the heat dissipation rates of automotive radiators has been proposed and also a new model equation of heat transfer rate of louvered fins has been proposed and tested. With the method, the effect of various design parameters on the performance of a radiator has also been studied.<br/> The proposed model equation for air-side heat transfer has made fair predictions which agree well with the experiments. Also the design value of heat dissipation rate with various fin pitches and radiator size has a good agreement with the heat dissipation of the commercial automotive radiators. Thus, the method of analyzing the radiator performance proposed in this study might be used to design new automotive radiators.<br/>
PDPA 와 화상처리법(PMAS)의 비교를 위한 분무 측정 실험
정종수(Jongsoo Jurng),이교우(Gyo woo Lee),정재화(J.H.Jurng),조복희(B.H.Cho) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
An experimental study on a characteristic of a water spray from a pressurized-type swirl nozzle was carried out in order to compare the two different measurement techniques for droplet sizing. An imaging measurement technique(PMAS) and a phase-Doppler measurement technique(PDPA) were used.<br/> The result of the PDPA was about 40 % higher than that of the PMAS in SMD(Sauter mean diameter). The PDPA technique is based on the light scattering of a particle, so the signal has a possibility of bias toward larger particles because of their stronger scattering intensity. On the contrary, because the PMAS technique is start from raw images, the particle which has larger velocity has fewer chances to be considered. So, the measured particle size of the PMAS is smaller than that of other techniques.<br/>
2 파장 보정 laser-induced Incandescence 법을 이용한 매연 농도 측정법
정종수(JONGSOO JURNG) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
To quantify the LII signals from soot particle in flames and Diesel engine cylinder, a new method has been proposed for correcting LII signal attenuated by soot particles between the measuring point and the detector and verified by an experiment on a laminar jet ethylene-air diffusion flame. Being proportional to the attenuation, the ratio of LII signal at two different detection wavelengths can be used to correct the measured LII signal and obtain the unattenuated LII signal, from which the soot volume fraction in the flame can be estimated. Both the 1064-nm and frequency-doubled 532-nm beams from the Nd: YAG laser are used. Single-shot, one-dimensional (1-0) line images are recorded on the intensified CCD camera, with the rectangular-profile laser beam using I-mm-diameter pinhole. Two broadband optical interference filters having the center wavelengths of 647 nm and 400 nm respectively and a bandwidth of 10 nm are used. This two-wavelength correction has been applied to the ethylene-air coannular laminar diffusion flame, previously studied on soot formation by the laser extinction method in this laboratory. The results by the LII measurement technique and the conventional laser extinction method at the height of 40 mm above the jet exit agreed well with each other except around outside of the peaks of soot concentration, where the soot concentration was relatively high and resulting attenuation of the LII signal was large. The radial profile shape of soot concentration was not changed a lot, but the absolute value of the soot volume fraction around outside edge changed from 4 ppm to 6.5 ppm at r=2.8 mm after correction. This means that the attenuation of LII signal was approximately 40% at this point, which is higher than the average attenuation rate of this flame, 10 - 15 %.<br/>