Experimental Investigation of Pressure Fluctuations on Inner Wall of a Centrifugal Pump
-
Xiao-Qi Jia
,
Bao-Ling Cui
,
Zu-Chao Zhu
Abstract
Affected by rotor–stator interaction and unstable inner flow, asymmetric pressure distributions and pressure fluctuations cannot be avoided in centrifugal pumps. To study the pressure distributions on volute and front casing walls, dynamic pressure tests are carried out on a centrifugal pump. Frequency spectrum analysis of pressure fluctuation is presented based on Fast Fourier transform and steady pressure distribution is obtained based on time-average method. The results show that amplitudes of pressure fluctuation and blade-passing frequency are sensitive to the flow rate. At low flow rates, high-pressure region and large pressure gradients near the volute tongue are observed, and the main factors contributing to the pressure fluctuation are fluctuations in blade-passing frequency and high-frequency fluctuations. By contrast, at high flow rates, fluctuations of rotating-frequency and low frequencies are the main contributors to pressure fluctuation. Moreover, at low flow rates, pressure near volute tongue increases rapidly at first and thereafter increases slowly, whereas at high flow rates, pressure decreases sharply. Asymmetries are observed in the pressure distributions on both volute and front casing walls. With increasing of flow rate, both asymmetries in the pressure distributions and magnitude of the pressure decrease.
Funding statement: This work was supported by the National Natural Science Foundation of China (Grant No. 51536008).
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© 2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original Research Articles
- Design of a Compact Crossover Diffuser for Micro Gas Turbines Using a Mean-Line Code
- Parametric Modeling and Dynamic Characteristics Analysis of a Power Turbine Rotor System
- Operation Study of Miniature Air-blast Atomizer under Very Low Liquid Pressures
- Investigation on the Time Error of Detonation Acoustic in Process of Formation and Propagation
- Experimental Investigation of Pressure Fluctuations on Inner Wall of a Centrifugal Pump
- Numerical Analysis of Exhaust Emission from an Aero Gas Turbine Combustor under Fuel-Rich Condition
- Film Cooling Mechanism of Combined Hole and Saw-tooth Slot
- A Multi-Regulator Linear Matrix Inequalities Approach for Aircraft Engine Limit Management
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Articles in the same Issue
- Frontmatter
- Original Research Articles
- Design of a Compact Crossover Diffuser for Micro Gas Turbines Using a Mean-Line Code
- Parametric Modeling and Dynamic Characteristics Analysis of a Power Turbine Rotor System
- Operation Study of Miniature Air-blast Atomizer under Very Low Liquid Pressures
- Investigation on the Time Error of Detonation Acoustic in Process of Formation and Propagation
- Experimental Investigation of Pressure Fluctuations on Inner Wall of a Centrifugal Pump
- Numerical Analysis of Exhaust Emission from an Aero Gas Turbine Combustor under Fuel-Rich Condition
- Film Cooling Mechanism of Combined Hole and Saw-tooth Slot
- A Multi-Regulator Linear Matrix Inequalities Approach for Aircraft Engine Limit Management
- Direct Numerical Simulation of Turbine Cascade Flow with Heat Transfer
- Effect of Tip Configurations on Aerodynamic Performance of Variable Geometry Linear Turbine Cascade
