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Wang S.,Nanjing Agricultural University | Wang S.,Anhui Polytechnic University | Hu Z.,Nanjing Research Institute of Agricultural Mechanization | Han Y.,Nanjing Agricultural University | Gu Z.,Nanjing Agricultural University
Drying Technology | Year: 2013

The effects of magnetron arrangement and microwave power combination on the drying uniformity of carrot were investigated in this study. The drying uniformity was influenced by magnetron location and quantity. Using one magnetron resuted in poor drying uniformity. However, when two magnetrons were applied, the drying uniformity was 80% after drying for 16 min, which was 93.49% when power combination of three magnetrons at powers of 400, 500, and 600 W were used. The optimal magnetron locations and a suitable microwave power combinations were determined to improve the drying uniformity of carrot. © 2013 Copyright Taylor and Francis Group, LLC. Source


Zhou L.,Nanjing Research Institute of Agricultural Mechanization | Zhang X.,Nanjing Forestry University | Lu X.,Nanjing Research Institute of Agricultural Mechanization | Ding S.,Nanjing Research Institute of Agricultural Mechanization
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2012

In order to investigate the characteristic of properties of the disc atomizer, the experimental and computational simulation methods were adopted. The optimum working rotational speed and the air velocity field at different rotational speeds of the disc atomizer were studied and validated by the experiment data. The results showed that the optimum rotational speed was 1400 r/min at the selected impeller. The velocity field of the disc atomizer was axial symmetry. The velocity of central plane diffused at a fixed angle and decayed along the centre line. The simulation data was closely related to the experiment data. Source


Zhou L.,Nanjing Research Institute of Agricultural Mechanization | Fu X.,Nanjing Research Institute of Agricultural Mechanization | Xue X.,Nanjing Research Institute of Agricultural Mechanization | Kong W.,Nanjing Research Institute of Agricultural Mechanization | Qiu W.,Nanjing Agricultural University
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2013

The jet mixing apparatus (JMA) is an important part for mixing the water with the pesticide, which has good prospect in large plant protection machinery. The parameter of area ratio, area of nozzle and distance between nozzle and mixing chamber were discussed by theoretical analysis. The standard k-ε two-equation model was adopted to simulate the interior flow field. Combined with experiment data, the performance characteristics, the effects of structural parameters on the JMA property were discussed. Results showed that the optimum area ratio was related to working pressure, outlet pressure and jet pressure. The distance between nozzle and mixing chamber should be equal to optimum extent of free stream. The maximum relative error and average error of relative pressure at different area ratio were 0.125 and 0.051, respectively. The numerical model and simulation method were validated validate to meet the requirements of engineering. The jet flow decreased when the relative pressure greater than 0.3. The maximum relative pressure was between 0.5 and 0.6 under different available pressures. The optimum area ratio of JMA was between 1.6 and 2.0. The optimum distance between nozzle and mixing chamber was between 2.6 mm and 4.6 mm. Source


Ding S.,Nanjing Research Institute of Agricultural Mechanization | Fu X.,Nanjing Research Institute of Agricultural Mechanization | Xue X.,Nanjing Research Institute of Agricultural Mechanization | Zhou L.,Nanjing Research Institute of Agricultural Mechanization | Lu X.,Nanjing Research Institute of Agricultural Mechanization
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013

Plant protection is very important for high yield and quality of fruits production. A new self-propelled sprayer with low height was developed accommodating small space and poor trafficability of conventional orchards which are densely planted with dwarf plants. The power transmission system of the machine was optimized and the air supply atomization device was designed. The power transmission system distributes power separately, so the fan, pump, walking and steering device can be controlled independently. Designing of the air supply device and main technical parameters of key parts were based on theories of fluid mechanics and pesticide delivery technique applications. The R+S channel, 9 impellers, 11 guide glades was adopted. The diameter of impellers was 0.6 m and the width of guide glades was 0.1 m. The fan property was tested and the performance curve graphic was drawn. Frequency transformer, torque meter, wind velocity indicator was used and the testing ring was put 1m ahead of the air enter which was connected with a set of rams to fan pipes. The ram's diameter are 0.6 m, as same as fan's. The results showed that air volume was 2.7 m3/s meet at 1400 r/min which demands design needs. The highest total pressure efficiency is 86% at 1600 r/min. As the speed increases, total pressure efficiency dropped rapidly but the power increased. The variation trends of the air volume and air pressure are not significant. The field experiment was conducted in an apple grove which was grown with "Jinshiji " apple trees. The experiment followed strictly the quality of air-assisted orchard sprayer (NY/T 992-2006) and evaluating regulations for the operation and spraying (GB/T17997-2008). The row space was 3 m × 2 m, diameter of the tree crown was 2 m, the height of the tree was 2.5 m. Three trees were randomly selected as sample trees. The intersection points of three horizontal layers and three vertical layers of each tree were set as sample points, that is, 27 sample points totally for one tree. Water-sensitive paper card with the same size to apple leaves were put on sample points both front and rear sides receiving droplets to measure the cover ratio of droplets. The paper cards were numbered according to the sample points. Paper cards were collected after droplets got dry. Droplets cover ratio of each paper card was measured by micro camera and droplets image processing system. Results showed that the spraying coverage and droplets density increased significantly with the increase of the fan speed, spraying manipulation was conducted at the condition of 0.5 MPa spray pressure, 1400 r/min fan speed, and 1.26 m/s velocity, the spraying coverage in front and rear of the leaf was 58.76% and 19.06% inside the tree, and 69.35% and 32.66% outside the tree crown, droplets density in front and rear of the leaf was 115 and 79 droplets/cm2 inside the tree, and 105 and 96 droplets/cm2 outside the tree crown. The operation efficiency reached to 0.91 hm2/h when the proportion of auxiliary time and operation time is one to two. Source


Ding S.,Nanjing Research Institute of Agricultural Mechanization | Fu X.,Nanjing Research Institute of Agricultural Mechanization | Xue X.,Nanjing Research Institute of Agricultural Mechanization | Zhou L.,Nanjing Research Institute of Agricultural Mechanization | Lu X.,Nanjing Research Institute of Agricultural Mechanization
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2013

A low self-propelled sprayer for conventional orchard was developed in order to solve the plant protection mechanization. The power distribution unit was designed by theoretical analysis and virtual prototype to realize all working parts running independently. Eight shifts were designed by main and assistant gear-box. The sprayer could switch two-wheel drive to four-wheel drive according to running condition. Its minimum trafficable height was 1600 mm. In the dosage range of 0-400 L, the front wheels crossed obstacles reduced from the 87 mm to the 70 mm, and rear wheel obstacles height was independent of dosage. The minimum turning radius was about 2000 mm. The simulation result by Creo Parametric 2.0 showed the sprayer worked steadily, and the velocity was between 1.5 to 16 km/h. The effects of pesticide volume on centre of gravity and stability were little. Source

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