In order to solve the problem that the pneumatic conveying system of cotton picker is easy to produce bad transportation and clogging

combined with the characteristics of cotton

based on the theory of particle aerodynamics

this paper analyzes the influence of cotton pellet size

density and diameter of pneumatic conveying pipe on suspension speed. Fluent software was used to simulate the influence of cotton on the characteristics of airflow field in the pipeline

and the experimental study was carried out. The simulation results show that in the process of pneumatic conveying

the airflow forms turbulence in the downstream region of cotton pellet. When the diameter of cotton pellet increases

the turbulence intensity also increases

resulting in the increase of the resistance of conveying cotton pellet and the decrease of conveying air velocity. The experimental results show that the size

density and diameter of pneumatic conveying pipe affect the suspension velocity. The suspension velocity decreases with the increase of cotton pellet diameter and increases with the increase of density. When the squeezing coefficient is less than 50%

the theoretical

simulation and experimental values are in good fit

which verifies the rationality of the simulation results. Through comprehensive consideration

the suspension velocity range of cotton was determined to be 7.55～12.00 m/s. The research results are helpful to determine the design parameters of pneumatic conveying pipeline

and provide a theoretical basis for optimizing the structure and working parameters of pneumatic conveying pipeline of cotton picker and determining the optimal fan type.