Study on Internal Flow and External Performance of a Semi-open Impeller Centrifugal Pump with Different Tip Clearances
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Xiao-Qi Jia
,
Yu-Liang Zhang
Abstract
To study the influence of tip clearance on internal flow characteristics and external performance of a prototype centrifugal pump with a semi-open impeller, the unsteady numerical simulation and performance experiments are carried out in this paper. The evolution process of leakage vortex with time t, the flow characteristics and the magnitude of leakage rate in tip clearance are obtained in details. The results indicate that the H-Q curve hump of centrifugal pump shows a weakened trend with the increasing of tip clearance Δc. Meanwhile, the leakage rate ΔQ and the ratio of leakage rate to discharge flow rate (ψ) gradually increase. At the same tip clearance, the leakage rate ΔQ increases, while the ratio of leakage rate to discharge flow rate (ψ) decreases with the increasing of discharge flow rate Q. It is found that higher volumetric loss account for a higher percentage of the total loss at small flow rate condition. There easily exist strong leakage vortexes in the impeller inlet, impeller passage and impeller outlet. The pressure difference between suction side and pressure side makes the fluid pass through the tip clearance layer to form a lower pressure region and leakage vortex.
©2015 by De Gruyter
Articles in the same Issue
- Frontmatter
- Study on Internal Flow and External Performance of a Semi-open Impeller Centrifugal Pump with Different Tip Clearances
- A Numerical Study of Spray Injected in a Gas Turbine Lean Pre-Mixed Pre-Vaporized Combustor
- Coupling Optimization Design of Aspirated Compressor Airfoil and Aspirated Scheme Based on Artificial Bee Colony Algorithm and CST Method
- Propagation of Different Types of Inflow Distortions through a Contra Rotating Fan Stage
- A Method to Determine the Slip Factor of Centrifugal Pumps through Experiment
- Investigation of Blade Angle of an Open Cross-Flow Runner
- Mixing Characteristics of Elliptical and Rectangular Subsonic Jets with Swirling Co-flow
- Effect of Operating Variables on the Performance of a Highly Loaded Annular Combustor
- Numerical Investigations on the Nanosecond Pulse Discharge Process of Disk-Shape Plasma Igniter
- Development of a High Efficiency In-Line Tube Fan Using CFD
Articles in the same Issue
- Frontmatter
- Study on Internal Flow and External Performance of a Semi-open Impeller Centrifugal Pump with Different Tip Clearances
- A Numerical Study of Spray Injected in a Gas Turbine Lean Pre-Mixed Pre-Vaporized Combustor
- Coupling Optimization Design of Aspirated Compressor Airfoil and Aspirated Scheme Based on Artificial Bee Colony Algorithm and CST Method
- Propagation of Different Types of Inflow Distortions through a Contra Rotating Fan Stage
- A Method to Determine the Slip Factor of Centrifugal Pumps through Experiment
- Investigation of Blade Angle of an Open Cross-Flow Runner
- Mixing Characteristics of Elliptical and Rectangular Subsonic Jets with Swirling Co-flow
- Effect of Operating Variables on the Performance of a Highly Loaded Annular Combustor
- Numerical Investigations on the Nanosecond Pulse Discharge Process of Disk-Shape Plasma Igniter
- Development of a High Efficiency In-Line Tube Fan Using CFD
