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이동식 미분무수 노즐의 소화 특성에 대한 수치 시뮬레이션
배강열(K. Y. Bae),정희택(H. T. Chung),김형범(H. B. Kim),김찬희(C. H. Kim),이창효(C. H. Lee),김창(C. Kim) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In the present study, the numerical investigation on the effects of water mist spray has been carried out for the fire suppression characteristics. The FDS are used to simulate the interaction of fire plume and water mists, and program describes the fire-driven flows using LES turbulence model, the mixture fraction combustion model, the finite volume method of radiation transport for a non-scattering gray gas, and conjugate heat transfer between wall and gas flow. The numerical model is consisted of a rectangular of L×W×H=4.0×4.0×2.5 m and a water mist nozzle that be installed 1.0 m from pool, and the whole walls are assumed the open. In the study, the parameter of simulation has two type that one is consisted of 24 hole on the primary flow surroundings and the other has 8 hole except the primary flow. Finally, the nozzle type that has 24 hole is appeared lower the characteristic of fire suppression than another type because of the flow through many holes is bad impact for the primary flow. The extinguishing time is obtained 65 sec in case of B-type and 170 sec in case of A-type, and B-type showed high effect of fire suppression about 2.6 times than A-type,
김형범,임정호,허유,Kim, Hyung-B.,Lim, Jung-H.,Huh, You 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.3
Multi-layered, prepreg or preform textile structures are often used in industrial components to achieve specific mechanical properties. Therefore a beam scanning method was developed to measure the internal structures of multi-layered preforms in a nondestructive way. The measurement system employed a low-energy X-ray beam and an X-ray detector. Specific software programs were also developed for image data processing. Trial measurements of textile specimens prepared from compound yams demonstrated the system's ability to image internal structures by detecting the layers' folded states. The method can feasibly be used for measuring the internal states of specimens with stacked textile structures.