Abstract
In this article, we proposed an active method of obstacle attached on the blade to control cavitation in centrifugal pump. The modified shear stress transport k-ω model with a local density correct...
Highlights
Cavitation in pumps appears at operating conditions where the pressure locally drops and below the vapor pressure
In the case of non-cavitating flow, the comparison of external performance of experiment with numerical simulation is shown in Figure 6, which presents the external performance for different height schemes
There is a sudden drop for the external performance curve of H4 and H5 at high flow rate, and the head decreases almost 20% and the efficiency decreases close to 10% compared to the NONE scheme, which can be explained that the over-high obstacles can block the internal passage and disturb the flow structure
Summary
Cavitation in pumps appears at operating conditions where the pressure locally drops and below the vapor pressure. The cavitation affects the steady flow situation and influences the dynamic response.[1] The types of cavitation in centrifugal pump present rotating cavitation,[2,3] cavitation surge,[4] choked surge, and other high-frequency flow instabilities.[5] During the process from cavitation inception to head break-off operation in a centrifugal pump, the accumulation of bubbles occurs and gradually breaks the normal energy exchange. The unsteady cavity collapses strongly affect the hydrodynamic performance and produce vibration, noise, cavitation erosion, and so many severe problems.[6] The leading edge cavitation is the main cavitation type in centrifugal pumps and is known to be responsible for severe erosion and head drop.[7] And the cavity occurs on the suction side of the blade at the low flow rate and the pressure side at the high flow rate, respectively. The net positive suction head (NPSH), cavitation number, and cavitation specific speed are usually employed to represent the operation condition
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