遠心ファンの小型・高性能化に関する研究

抄録

In this research, it is important to achieve the compact fan size with the high performance and reduce the fan noise for the special applications. As a first step, focus on the miniaturization and high efficiency of the centrifugal fan with the special volute, the internal flow condition of a conventional model that called “Base model” was investigated by the numerical analysis. As a result, the recirculation flow occurred near the volute tongue in the Base model, because of the disagreement of the flow rate and volute size. Therefore, the new volute called “Volute mini model” was designed to suppress the recirculation flow and its performance was evaluated at the partial, operating and high flow rates. In the Volute mini model, the total pressure efficiency improves at all flow rates compared to the Base model. Furthermore, the recirculation flow near the volute tongue can be suppressed significantly, and the flow condition at the exit of the volute becomes uniform.