Abstract: Cleaning capability is an important research direction of dishwasher. Fan nozzles are widely used in cleaning industry because of its large coverage and uniform injection, so it is proposed to apply fan nozzles in dishwasher scenarios. The jet model of fan-shaped nozzle is established by computational fluid dynamics (CFD), the numerical simulation results are analyzed, and the jet characteristics of the fan-shaped nozzle are obtained. The advantages and disadvantages of the circular nozzle and the fan-shaped nozzle jet characteristics are compared and analyzed. High-speed photography technology was used to photograph the actual jet flow of two nozzles. Finally, by analyzing and comparing the cleaning test data, it was found that the cleaning index of the fan-shaped nozzle spray arm can reach 1.2, which is 1.11 higher than that of the circular nozzle. Further verify the improvement effect of the fan-shaped nozzle on the cleaning efficiency of the dishwasher, and provide direction for the optimization of the dishwasher spray arm.

Key words: Dishwasher, Fan-shaped nozzle, Washing efficiency