Optimization Design And Experimental Study Of Multi-channel Automatic Sand Sampler

Soil erosion is a major environmental problem in arid and semi-arid regions.It is the process of soil erosion,separation and transportation under the action of wind.Soil erosion can cause soil texture coarse and structure deteriorate.The sand sampler is an important device for studying soil erosion,which is a key equipment in the observation of sand flow structure and sand movement research.We need to continue to innovate and optimize the design of sand sampler equipment,so that we can obtain a large and accurate wind data.FLUENT software and micro wind tunnel are used as test platform to optimize the exhaust-pipe diameter,exhaust-pipe length,desilting-port diameter,desilting-port contraction height of the separator of the shunt-hedging sand sampler.Numerical simulation and wind tunnel test results showed that the optimized sand separator exhaust-pipe and desilting-port deceleration performance compared with the original sand separator has been improved obviously.When the exhaust-pipe diameter is 25mm,the exhaust-pipe length is 25mm,the contraction height is 75mm and the desilting-port distance is 15mm in the strong wind condition(13.8m/s),the impact of the gas flow on the automatic acquisition of the sensor is minimal.The maximum wind speed of the exhaust-pipe is 2.23m/s,which is 7.47%lower than that of the original sand separator.The average wind speed of the exhaust-pipe is 0.68m/s,which is 8.11%lower than that of the original sand separator.The maximum wind speed of the desilting-port is 1.52m/s,which is 35.59%lower than that of the original sand separator.The average wind speed of the desilting-port is 0.23m/s,which is 28.13%lower than that of the original sand separator.The average separation efficiency is 99.82%,which is 0.02%higher than that of the original sand separator.In the three basic principles of equal dynamic performance,high efficiency and non selective,optimized the guide plate,shell,rotating device,support structure and monomer of multi-channel automatic sand sampler.The speed reduction and sand collection performance of the sand sampler are tasted.The experimental result indicated that the optimized multi-channel automatic sand sampler has better speed reduction performance and sand collection performance.The average sand collecting efficiency is 91.98%and equal dynamic performance is 92.06%.The sand sampler works well in the field.