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Numerical and experimental study of variable speed automobile engine cooling water pump
Wei Li1, Leilei Ji1, Lingling Ma1
1National Research Center of Pumps, Jiangsu University, Zhenjiang, China.
Science Progress
|June 10, 2020
Summary
This study examines engine cooling water pump performance at varying speeds. Increased speed enhances head but worsens efficiency and cavitation resistance due to internal flow issues.
Area of Science:
- Automotive Engineering
- Fluid Dynamics
- Thermodynamics
Background:
- Engine cooling water pumps are critical for thermal management in automobiles.
- Variable rotating speeds affect pump performance and efficiency.
- Understanding cavitation is crucial for pump reliability and longevity.
Purpose of the Study:
- To investigate the hydraulic and cavitation performance of an engine cooling water pump under variable rotating speeds.
- To validate numerical simulation accuracy against experimental data.
- To analyze the impact of increased rotating speed on internal flow fields and energy losses.
Main Methods:
- Experimental tests were conducted on an engine cooling water pump at speeds of 2650, 2960, 3700, and 4300 r/min.
- Numerical simulations were performed to predict pump performance.
- Hydraulic performance at 3700 r/min and cavitation performance at 340 L/min were specifically analyzed.
Main Results:
- The simulation results showed high accuracy when compared to experimental data.
- Pump head increased with rotating speed, shifting the best-efficiency region towards higher flow rates.
- Increased speed led to deteriorated internal flow fields, higher energy losses (tip leakage, rotor-stator interaction), and weakened anti-cavitation performance.
Conclusions:
- Numerical simulations are reliable for predicting engine cooling water pump performance.
- Higher rotating speeds improve pump head but reduce overall efficiency and increase cavitation risk.
- Rotor-stator interaction is a significant factor affecting performance and is sensitive to temperature.
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