Abstract
The startup period, one of several transient operations in a centrifugal pump, takes note of some problems with these devices. Sometimes a transient high pressure and high flow rate over a very short period of time are required at the startup process. The pump’s dynamic response is delayed because of the rotational inertia of the pump and motor. Our research focuses on how to get a large flow in a short time when the pump cannot meet the requirements alone without a large power driver. To achieve a strong response in the startup process, a ball valve is installed downstream of the pump. The pump’s transient behavior during such transient operations is important and requires investigation. In this study, the external transient hydrodynamic performance and the internal flow of the pump during the transient startup period are studied by experiments and simulations. In order to find an appropriate matching method, different experiments were designed. The content and results of this paper are meaningful for performance prediction during the transient pump-valve startup period.
Highlights
The transient operations of a pump such as the startup and shutdown periods occur in several applications of hydraulic systems
Tsukamoto and Ohashi [2,3] studied the transient characteristics of a centrifugal pump, and the acceleration of the pump at the startup stage was very fast
Results2020, and8,Discussion for the Experiment shows the changes in pressure during the startup period
Summary
The transient operations of a pump such as the startup and shutdown periods occur in several applications of hydraulic systems. A sudden startup of the pumps will cause strong pressure fluctuations and power shocks. Tsukamoto and Ohashi [2,3] studied the transient characteristics of a centrifugal pump, and the acceleration of the pump at the startup stage was very fast. They found that the hysteresis and transient pressure fluctuation around the vanes results in a difference between the dynamic and quasi-steady characteristics
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