A study on numerical methods for transient rotating flow induced by starting blades

Wu, Dazhuan; Chen, Tao; Sun, Youbo; Li, Zhifeng; Wang, Leqin

doi:10.1080/10618562.2012.715154

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…In this situation, the nodes of the mesh move in space (relative to the fixed, global coordinates), but the cells defined by the nodes do not deform. 25 Furthermore, the adjacent mesh zones can be linked through one or more nonconformal interfaces. As long as the interfaces stay in contact with one another, fluid can pass from the intersection zone of the interfaces.…”

Section: Numerical Modelmentioning

confidence: 99%

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

Yang

Lai

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this study, three-dimensional computational fluid dynamics simulation was adopted to evaluate the valve-induced water hammer phenomena in a typical tank-pipeline-valve-tank system. Meanwhile, one-dimensional analysis based on method of characteristics was also used for comparison and reference. As for the computational fluid dynamics model, the water hammer event was successfully simulated by using the sliding mesh technology and considering water compressibility. The key factors affecting simulation results were investigated in detail. It is found that the size of time step has an obvious effect on the attenuation of the wave and there exists a best time step. The obtained simulation results have a good agreement with the experimental data, which shows an unquestionable advantage over the method of characteristics calculation in predicting valve-induced water hammer. In addition, the computational fluid dynamics simulation can also provide a visualization of the pressure and flow evolutions during the transient process.

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Section: Numerical Modelmentioning

confidence: 99%

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

Yang

Lai

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Wu [9,10] conducted simulations of the blades during startup periods. In two-dimensional simulations, he found that the sliding mesh method has a higher efficiency and stability than the dynamic mesh and dynamic reference frame methods.…”

Section: Introductionmentioning

confidence: 99%

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

Qiao

Ma²,

et al. 2020

Processes

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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.

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“…1–3 With continuous expanding of application in various areas and higher requirements in energy saving and noise reduction, the hydraulic characteristics of the transient conditions such as the start and stop of the mixed-flow pump have aroused people's great concern. 4–6 However, due to the special structure of the mixed-flow pump, the startup time is short, and the flow has a strong transient effect, it is very difficult to predict the transient hydraulic characteristics and to measure the internal flow field.…”

Section: Introductionmentioning

confidence: 99%

Particle image velocimetry experiment of the inlet flow field in a mixed-flow pump during the startup period

Shi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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The transient characteristics of the inlet flow field of mixed-flow pump during start-up process are hard to be measured experimentally. The elbow structure with viewport is designed before the mixed-flow pump for capturing the transient inlet flow fields of the mixed-flow pump. Meanwhile, the synchronous data acceptance system is also designed to collect the data from different sensors synchronously. Besides, uncertainty analysis is carried out after the experiment to ensure the accuracy and reliability of this test system. The transient external characteristics are obtained and the velocity distribution of a mixed-flow pump during the startup period is measured using particle image velocimetry technique. The results show that the overall uncertainty for the external characteristics was 0.2345%, which indicates the high accuracy of this test bench for capturing the transient flow condition in the mixed-flow pump during the startup period. At the beginning of the start-up process, the head of the mixed-flow pump increases and reaches the maximum once the rotation speed meets the maximum value and an instantaneous impulsive head appears at the end of the accelerating process. However, with the increase of the rotating speed, wall boundary layer gradually develops from laminar to turbulent flow, and the flow moves continuously from the hub center to the inlet. At the end stage of the accelerating process, more intensive entrainment effect of the impeller is found. When the rotation speed is steady, the influence of the elbow on the internal flow fields gradually decreases, compared with the startup process. The results can serve as a fundamental reference for the investigation of transient flow characteristics of the mixed-flow pump during the startup period.

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A study on numerical methods for transient rotating flow induced by starting blades

Cited by 9 publications

References 27 publications

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

Three-dimensional computational fluid dynamics simulation of valve-induced water hammer

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

Particle image velocimetry experiment of the inlet flow field in a mixed-flow pump during the startup period

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