Next Article in Journal
Titanium Distribution Ratio Model of Ladle Furnace Slags for Tire Cord Steel Production Based on the Ion–Molecule Coexistence Theory at 1853 K
Next Article in Special Issue
Modeling and Thermal Analysis of a Moving Spacecraft Subject to Solar Radiation Effect
Previous Article in Journal
Automatic Hybrid Attack Graph (AHAG) Generation for Complex Engineering Systems
Previous Article in Special Issue
DynamFluid: Development and Validation of a New GUI-Based CFD Tool for the Analysis of Incompressible Non-Isothermal Flows
Article

Numerical Study of the Unsteady Flow Characteristics of a Jet Centrifugal Pump under Multiple Conditions

by 1,2,*, 1,2,*, 1,2 and 1,2
1
School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2
Key Laboratory of Fluid Machinery and Systems, Lanzhou 730050, China
*
Authors to whom correspondence should be addressed.
Processes 2019, 7(11), 786; https://doi.org/10.3390/pr7110786
Received: 28 September 2019 / Revised: 21 October 2019 / Accepted: 28 October 2019 / Published: 1 November 2019
(This article belongs to the Special Issue CFD Applications in Energy Engineering Research and Simulation)
To study the reasons for the low efficiency of jet centrifugal pumps (JCPs) and the mechanism of unsteady flow characteristics under multiple conditions, taking a JET750G1 JCP as the object, three-dimensional steady and unsteady numerical calculations of the model pump were carried out using the kω turbulence model. The transient fluctuation characteristics of the flow field in the major flow passage components and the spatial and temporal evolution laws of vortices in the rotor–stator cascades were analyzed. The accuracy of the numerical method was verified by experiments. The results show that there are various scales of flow distortion phenomena in the chamber of the JCP, such as eddies, blockage of the flow passage, recirculation, secondary flow, and circulation, which not only cause great hydraulic loss, but also destroy the flow stability, symmetry, and balance in the other flow passage components. This is an important reason for the obviously lower efficiency of a JCP compared to a general centrifugal pump. The spatial and temporal evolution laws of vortices in the rotor–stator cascades are mainly related to the relative positions of the impeller blades and guide vane blades. The formation mechanism of the unsteady flow field fluctuation characteristics of JCPs is mainly related to the number of blades in the rotor–stator cascades and the operation parameters of the pump. The fluctuation intensity of the flow field inside the impeller and guide vane is obviously greater than that in the other flow areas, reflecting that the rotor–stator interaction is the decisive factor affecting the unsteady flow characteristics of a JCP under multiple conditions. View Full-Text
Keywords: jet centrifugal pump (JCP); unsteady flow; numerical calculation; pressure fluctuation; rotor–stator interaction jet centrifugal pump (JCP); unsteady flow; numerical calculation; pressure fluctuation; rotor–stator interaction
Show Figures

Figure 1

MDPI and ACS Style

Guo, R.; Li, R.; Zhang, R.; Han, W. Numerical Study of the Unsteady Flow Characteristics of a Jet Centrifugal Pump under Multiple Conditions. Processes 2019, 7, 786. https://doi.org/10.3390/pr7110786

AMA Style

Guo R, Li R, Zhang R, Han W. Numerical Study of the Unsteady Flow Characteristics of a Jet Centrifugal Pump under Multiple Conditions. Processes. 2019; 7(11):786. https://doi.org/10.3390/pr7110786

Chicago/Turabian Style

Guo, Rong, Rennian Li, Renhui Zhang, and Wei Han. 2019. "Numerical Study of the Unsteady Flow Characteristics of a Jet Centrifugal Pump under Multiple Conditions" Processes 7, no. 11: 786. https://doi.org/10.3390/pr7110786

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop