Simulation and Verification of Arrangement Optimization on Cotton Suspender Sprayer Nozzles Based on CFD
-
摘要: 针对棉花中后期因冠层郁闭导致施药效果差的问题，对76 cm等间距种植的机采棉进行数据采集并建立模型，以高地隙吊杆式喷雾机为载体，采用CFD离散相模型对锥形雾化喷头的喷洒效果进行仿真模拟。以最低喷头离地高度、喷头间距及α角度为试验因素，以雾滴在棉花叶片正、反面的覆盖率作为评价指标，设计响应面试验，研究喷头布置参数对喷雾效果的影响。结果表明：当最低喷头离地高度为400mm、喷头间距为300mm、α角为30°时，雾滴在叶片正、反面覆盖率平均预测值分别为20.283%和11.042%。利用实际棉花模型对仿真结果进行验证试验，雾滴在棉株叶片正、反面的平均覆盖率分别为21.79%和11.97%,正、反面覆盖率相对误差最大分别为8.02%和9.40%。试验结果表明：模型可靠，优化结果可改善中、下层叶片受药情况，棉株整体受药良好。Abstract: In order to solve the problem that the spraying effeciency is low due to canopy closure of cotton in the middle and later grow stages. The data of machanical harvest cotton whit 76 cm equal spacing was collected, and the model of cotton was establishied. Taking high clearance suspender sprayer as the carrier, the spraying effect of conical atomizer was simulated by CFD discrete phase model. To research the influence of nozzles arrangement, a response surface test was designed. Taking the ground clearance of lowest nozzle, distance between nozzles and α angle as experiment factors; and the coverage rate of droplets on the front and back of cotton blades was used as evaluation indexes. The optimized results is the ground clearance of lowest nozzle is 400 mm, the distance between nozzles is 300 mm, and the α angle is 30°. At this time, the average predicted values of droplets coverage on the front and back of the blades are 20.283% and 11.042%. Using the actual cotton model to verify the simulation results, the average coverage of droplets on the front and back of cotton blades are 21.79% and 11.97%, and the maximum relative error is 8.02% and 9.40%, respectively. The experiment results show that the model is reliable. And the optimized arrangement of nozzles can improve the droplets deposition on the middle and lower blades, the whole cotton plant is well coveraged by droplets as well.
-
Keywords:
- cotton /
- apply medicine machines tools /
- response surface test /
- optimization /
- CFD
-
计量
- 文章访问数: 0
- HTML全文浏览量: 0
- PDF下载量: 0
下载:
