Application of LIF for Diffusion in Building Wake

• Main Authors: Wang, Chi-mei, 王其美
• Other Authors: Chu Chia-Ren
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/95675681560077153461

碩士 === 國立中央大學 === 土木工程學系 === 86 === Smoke released from a stack in the vicinity a rectangular building wereinvestigated in a towing tank. Trajectories and concentration distributionsof smoke were measured by the planar laser-induced fluorescence (PLIF)and image processing method. This method allows us to investigate thetemporal-spatial distribution of the smoke, which is much more difficult toobtain from traditional point tracer measurements. The relative height ofstack Hs/Hb, location L/Hb, velocity ratio Ur and smoke densimetricFroude no. Fo were systematically varied in the experiment. It was found,downwash will happen behind the building when Ur < 2.4. Thisphenomenon has a marked effect on the smoke trajectory and its near-fielddilution. The results of this study can be used for the design of smoke stack.