Study on the Transient Characteristics of the Centrifugal Pump during the Startup Period with Assisted Valve

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.

Investigation on the flow and induced-noise mechanism during the transient start-up process of a mixed-flow pump

“…Building upon this foundation, more scholars have focused on the flow patterns and noise generation mechanisms within the pump, and have discovered that unsteady flow separation on the suction side of the blades and periodic pressure fluctuations on the blade surface are the main source for noise generation (Choi et al, 2003). Li et al have identified hydraulic imbalance and blade-dynamic interference as the main causes of shaft vibration by studying the unsteady pressure fluctuation characteristics and axial trajectories of mixed-flow pumps (Li et al, 2018a;Li et al, 2020a). Wang et al have improved the stability of pumps and reduced noise by studying the relationship between pressure fluctuation, vibration, and noise in multi-stage pumps (Wang et al, 2018).…”

“…During the daily operation of the mixed-flow pump, transient events inevitably occur, such as the influence of valves on fluid performance (Li et al. , 2020a, b, c) rapid start-stop operations (Yang et al.…”

“…have identified hydraulic imbalance and blade-dynamic interference as the main causes of shaft vibration by studying the unsteady pressure fluctuation characteristics and axial trajectories of mixed-flow pumps (Li et al. , 2018a; Li et al. , 2020a).…”

Evolution Characteristics of Energy Change Field in a Centrifugal Pump during Rapid Starting Period

“…Dai et al [16] proposed three novel transcritical CO 2 high-temperature heat pump systems to recover waste heat. Besides, in recent years, research on the starting of a multistage centrifugal pump [17] and a centrifugal pump with assisted valve [18] has also made some progress.…”

Analysis of Unsteady Flow Characteristics of Centrifugal Pump under Part Load Based on DDES Turbulence Model

“…In this era background, more and more scholars at home and abroad focus on the experiment and research of centrifugal pumps. Zou et al [4], Li et al [5], and Yun et al [6] all researched with the centrifugal pump during the startup process, obtaining the evolution features of the internal flow field and analyzing some fluid phenomena, which can provide some reference for the research of prototype pump's startup period. As a mechanical device of energy conversion and fluid transportation, rotor-stator interaction (RSI) is the main factor of vibration and noise in a centrifugal pump.…”