Impact of the Volute Basic Circle Diameter of Sewage Pump on Pressure Pulsation

The unsteady flow field in the channel sewage pump with three different basic circle diameters of volutes were numerically simulated based on the Fluent commercial software, using the standard k-ε turbulence model, the SIMPLE algorithm, and the sliding mesh technique. By setting pressure measurement points, the pressure pulsation in different positions can be obtained. The impact of the basic circle diameter of volute on the internal pressure pulsation characteristics of a sewage pump was analyzed based on frequency domain and time domain graphs. The results show that the smaller the basic circle diameter of volute is, the more turbulent the pressure pulsation is. The Coefficient of pressure pulsation amplitude reaches the maximum value with small gaps in the volute and impeller clearance. The closer the monitoring point to the cutwater, the greater the amplitude of pressure pulsation. In a flow channel of volute, the pressure fluctuation presents cyclical changes, and a small gap flow reaches the strongest unsteady characteristics. Pressure pulsation cycle is associated with the number of impeller blades and a period of three peaks is the blade passing frequency. The dominant frequency of pressure pulsation is 73.5Hz, which is the threefold frequency of rotation frequency.

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W artykule przedstawiono wyniki i opis symulacji przepływu w pompie kanalizacyjnej z trzema różnymi średnicami sprężyn napędowych. W badaniach wykorzystano oprogramowanie Fluent, jeden ze standardowych modeli turbulencji (k-epsilon), algorytm SIMPLE oraz technikę siatki przesuwnej. W analizie skupiono się na przypadku wystąpienia zakłóceń przepływu w kanale. Dokonano analizy wyników i przedstawiono wnioski.