In order to improve the quality of tea wind-selecting, tea particles’ running track and indoor flow state of winnowing room were studied by the methods of theoretical analysis and fluid dynamics simulation, and combined with experimental verification. The results showed that the effective drift distance between particles of different weight is greater than the other air velocity distribution program when the air velocity distribution near wind crossing was set at rising from the top to the bottom. Vortexes are found in winnowing room due to structural reasons. Trajectory of tea in No. 4 and No. 5 export is more susceptible to the disturbance of the vortex because of its weight. Vortex could be decreased by using spoiler, which will also reduce the proportion of mixed tea and improve the winnowing quality.
ZHONG Jiang
,
HUANG Jian-hong
,
YANG Tao
,
ZHANG Xian
,
ZHAO Zhang-feng
. Optimization Study of Tea Winnowing Machine[J]. Journal of Tea Science, 2013
, 33(6)
: 576
-583
.
DOI: 10.13305/j.cnki.jts.2013.06.004
[1] Qianpu Wang, Morten Chr Melaaen, Sunil R De Silva. Investigation and simulation of a cross-flow air classifier[J]. Powder Technology, 2001, 120(3): 273-280.
[2] Eswaraiah C, Kavitha T, Vidyasagar S, et al. Classification of metals and plastics from printed circuit boards (PCB) using air classifier[J]. Chemical Engineering and Processing: Process Intensification, 2008, 47(4): 565-576.
[3] Oon C S, Togun H, Kazi S N, et al. Numerical simulation of heat transfer to separation air flow in an annular pipe[J]. International Communications in Heat and Mass Transfer, 2012, 39(8): 1176-1180.
[4] 李洪昌, 李耀明, 唐忠, 等. 风筛式清选装置振动筛上物料运动CFD-DEM数值模拟[J]. 农业机械学报, 2012, 43(2): 79-84.
[5] 蒋帅, 李如燕, 孙可伟. 风选技术在建筑废弃物资源化中的应用[J]. 安徽农业科学, 2012, 40(25): 12605-12608.
[6] Michael James Lee, Shahin Rahimifard.An air-based automated material recycling system for postconsumer footwear products[J]. Resources Conservation and Recycling, 2012, 69: 90-99.
[7] Siemens Mark C, Hulick Donald E.A new grain harvesting system for single-pass grain harvest, biomass collection, crop residue sizing, and grain segregation[J]. Transactions of the ASABE, 2008, 51(5): 1519-1527.
[8] 谭春亮, 王科社, 范涛, 等. 风选机的气流场分析与优化设计[J]. 北京机械工业学院学报, 2006, 21(1): 20-23.
[9] Maysam Saidi, Reza Maddahian, Bijan Farhanieh, et al. Modeling of flow field and separation efficiency of a deoiling hydrocyclone using large eddy simulation[J]. International Journal of Mineral Processing, 2012, 112: 84-93.
[10] Tanvir Farouka, Bakhtier Farouka, Alexander Gutsol.Simulation of gas species and temperature separation in the counter-flow Ranque-Hilsch vortex tube using the large eddy simulation technique[J]. International Journal of Heat and Mass Transfer, 2009, 52(13/14): 3320-3333.
浙公网安备 33019902000101号 
