±¹Á¦ÇмúÁö³í¹®
(2004) Development of vertical wind and turbulence profiles of wind tunnel boundary layers
Journal: Transactions of the ASAE 47(5), pp.1717−1726.
Author: I.−B. Lee, C. Kang, S. Lee, G. Kim, J. Heo, S. Sase
Abstract
Ventilation is considered one of the most important factors for livestock and plant environmental control. However,
because of the difficulties of conducting field experiments, aerodynamic studies of ventilation and HVAC of agricultural buildings are difficult and expensive to conduct effectively in full−scale buildings. A wind tunnel can be the most powerful technology for studying aerodynamics because it works with real airflow and the boundary conditions can be easily changed. A large, multi−purpose wind tunnel was built at the National Institute of Agricultural Engineering (NIAE) in Korea in 2002. In this research, the formation of boundary layers, such as vertical wind and turbulence profiles, in the test section of the wind tunnel was studied to determine ventilation efficiency and internal airflow characteristics of naturally ventilated buildings. Compared to measured data, it was found that the optimum wind and turbulence profiles of a 20 m boundary layer could not be achieved using the theory and experimental procedures of civil and architectural engineering because that would require several hundred meters of boundary layer thickness. Moreover, it was impossible to achieve 30% turbulence intensity just above the floor. Finally, it was found that lattice and blocks could be effectively used to design an optimum boundary layer for aerodynamic study of agricultural buildings. When using lattice and blocks, the wind and turbulence profiles were seriously affected by the distance between the lattice and the measurement location, by the distance between adjacent bars of lattice, and by the width of the bars.
Keywords: Aerodynamics, Boundary layer, Turbulence, Wind tunnel, Wind velocity
Download Link :
https://elibrary.asabe.org/abstract.asp?aid=17614
- ´ÙÀ½±Û
- (2004) Principles of sand dune fixation with straw checkerboard technology and its effects on the environment
- / A3EL
- (2004) Principles of sand dune fixation with straw checkerboard technology and its effects on the environment
Journal:Journal of Arid Environments 56, pp.449-464.
Author:Guo Yu Qiu, In-Bok Lee, Hideyuki Shimizu, Yong Gao,Guodong Ding
Abstract
The straw checkerboard technique is used for ..
- ÀÌÀü±Û
- (2004) Study on Forced Ventilation System of a Piglet House
- / A3EL
- (2004) Study on Forced Ventilation System of a Piglet House
Journal:JARQ 38 (2), pp.81 - 90.
Author:In-Bok LEE, Byeong-Ki YOU, Chang-Ho KANG, Jong-Gil JEUN,Gyeong-Won KIM, Si-Heung SUNG and Sadanori SASE
Abstract
The objective of this study was, using the data of field experiment and visua..
QUICK
MENU
TOP