Research On Performance Of Cooling Fans Characteristic Parameters On Passenger Cars

Cooling fan is the key part of the active heat dissipation in the powertrain cooling system of passenger car,and its performance directly affects the cooling effect of the cooling system.Most of the cooling fans for passenger vehicles are axial-flow plastic leaf fans,which have the characteristics of high reliability,small size and easy layout.As the cooling system cooling requirements increase,the limitations of the engine compartment space makes it difficult to improve the performance of radiator,so improving the performance of cooling fan becomes the key.The fan with large air volume and high efficiency has become an important subject in fan development.This paper first introduces the working principle,structural characteristics and performance parameters of the passenger car cooling fan,and then clarifies the general method of passenger car cooling fan selection.Then the basic theory of cooling fan simulation analysis is introduced,including basic control equations,numerical simulation methods and classification,turbulence model and numerical simulation methods.Secondly,the structure and principle of the test bench for the aerodynamic performance of the cooling fan are described.At the same time,the test method and test data processing method are introduced.The simulation and test results were then compared and analyzed with an error of less than 5%,confirming the accuracy of the simulation method.In this paper,the main characteristic parameters of the cooling fan are studied,such as the number of blades,the blade installation angle,the blade thickness,the axial clearance and radial clearance of the fan blade and shroud,which affect the aerodynamic performance of the cooling fan.Ensure that the remaining parameters are the same and only change the single parameter under study.By establishing multiple fan models,the fan digital model is simulated and calculated,and the correlation between this parameter and the aerodynamic performance of the fan is analyzed,which plays a supporting role in optimizing the fan performance.The study found that the number of blades and blade installation Angle have a great influence on the air flow and static pressure efficiency,axial clearance and radial clearance have a certain influence on the air flow,mainly have a great influence on the static pressure efficiency,while the blade thickness has a small influence on the fan air flow but has a great influence on the static pressure efficiency.Finally,the orthogonal test design method is adopted to optimize the design of the existing cooling fan for the performance requirements of a certain fan.The number of blades,the blade installation angle,the axial clearance and radial clearance of the fan blade and shroud these four factors are selected for analysis,and the aerodynamic performance data of multiple sets of fans after combination of various test factors are obtained,obtained the optimal optimization plan.The optimized fan air volume and static pressure efficiency were increased by 18.6% and 4.4%,respectively to meet the cooling requirements of the cooling system.