科研之友
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摘要
In order to improve the cleaning quality and efficiency of a rice combine harvester, a cleaning system comprising a centrifugal fan and four outlet ducts was developed. Three multi-duct centrifugal fans with the same rotor but different upper outlet positions and volute walls were studied numerically and experimentally to evaluate the impact of the upper outlet on the inner flow field distribution of the fan. Computational fluid dynamics (CFD) was used to analyze the velocity profiles, flow rate, internal velocity, and pressure of the centrifugal fan. Experiments were performed using hot-wire anemometers to measure the velocity at the four outlets of the fan to validate the simulations. CFD simulations were used to perform detailed flow visualization, velocity profile and flow rate estimation, and internal velocity field and pressure field analysis. Special attention was paid to the effect of the upper outlet on the inner flow field distribution and on achieving a balanced airflow division between the four outlets. It was observed that the internal field distribution and the mass flow rate division between the four outlets can be greatly influenced by the upper outlet position. The optimal structure of the multi-duct centrifugal fan was obtained for the rice combine.
- 出版日期2016
- 单位江苏大学
