Background: Water pump is the core of engine cooling system, the irrational design will
make the engine too warm or too cold, both will influence the efficiency of the engine. Therefore, it is
significant for an engine to design one good water pump. Various patents have been discussed in this
Objective: In this study, we designed a good water pump to match its engine cooling system to reduce
the cost of R&D by design and simulation.
Methods: According to the actual working characteristics of an automotive centrifugal pump, we built
its computational fluid model. At 80°C and different speeds, using freshwater as cooling liquid, Computational
Fluid Dynamics (CFD) technique was used to analyze the 3D turbulent flow inside the
pump. Following this, the static pressure, speed and the turbulent kinetic energy distribution of the internal
flow field of the pump were discussed. The pump head and efficiency were stimulated by using
the CFD technique and compared with the results obtained from the experiments.
Results: The experimental results showed that the obtained pump head and efficiency were in good
agreement and the accuracy of the performance prediction can be guaranteed within 10%. When the
speed was constant, in the case of small flow, the measured pump flow and head were different from
CFD numerical simulation, while the consistency of efficiency was better. When the pump exceeded
the maximum performance point under the constant speed, the flow continued to increase, the head
difference in the centrifugal pump between CFD simulation and test became larger, and the measured
test efficiency declined continuously from the maximum.
Conclusion: The results showed that the complex condition of running water inside the pump can be
exactly stimulated by the CFD technique, especially about the pump head and its efficiency, which
provided the theoretical foundation for the later structural designs and optimization of the pump conduit.