Abstract
The numerical method on a double-channel sewage pump was studied, while the corresponding experimental result was also provided. On this basis, the influence of wall roughness on the pump performance was deeply studied. The results showed that there was a critical value of wall roughness. When the wall roughness was less than the critical value, it had a great influence on the pump performance, including the head, efficiency, and shaft power. As the wall roughness increased, the head and efficiency were continuously reduced, while the shaft power was continuously increased. Otherwise, the opposite was true. The effect of wall roughness on the head and hydraulic loss power was much smaller than that on the efficiency and disk friction loss power, respectively. With the increase of wall roughness, mechanical efficiency and hydraulic efficiency reduced constantly, leading to the decrement of the total efficiency. With the increase of flow rate, the effect of wall roughness on the head and efficiency gradually increased, while the influence on the leakage continuously reduced. The influence of the flow-through component roughness on the pump performance was interactive.
Highlights
Pumps are classified as general machinery with varied applications [1,2,3,4,5]
The double-channel sewage pump has the characteristics of compact structure, high efficiency, and good anti-winding and anti-clogging performance, while it has a wide application range, which has been studied by a large number of scholars [6,7,8,9,10]
It is well known that pumps have huge energy consumption, and wall roughness has an important effect on pump efficiency [11,12,13,14,15,16]
Summary
Pumps are classified as general machinery with varied applications [1,2,3,4,5]. Sewage pump, as important equipment in the sewage treatment project, is widely used in chemical, municipal, and other industries. It is mainly used to transport production and domestic sewage containing a large amount of solid particles or fibrous solid substances. The double-channel sewage pump has the characteristics of compact structure, high efficiency, and good anti-winding and anti-clogging performance, while it has a wide application range, which has been studied by a large number of scholars [6,7,8,9,10]. In the process of using the double-channel sewage pump, the abrasion of the wall surface caused by the impurities in the transport medium and the damage of the blade surface caused by erosion will cause the change of the wall roughness, and roughness Ra is one of the important factors affecting the performance of the pump
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