| With the progress of fracturing technology and the large-scale development of oil and gas Wells,the power of fracturing pump is also rising,resulting in a corresponding increase in the heat generated by the power end of fracturing pump.In addition,the fracturing truck is operating in a harsh environment with less natural air volume.As an important part of the cooling system of fracturing truck,cooling fan can make heat exchange between cooling air and radiator group.Take away the heat of the coolant and high temperature parts to ensure the normal operation of the power system.The cooling fan with excellent performance often needs a variety of good structural parameter combination,and it must also have a good matching relationship with the radiator group,and the cooling module components reasonably arranged at the power end of the fracturing pump.At present,there are few researches on the heat dissipation system of fracturing pump at home and abroad.Taking the above factors into account,this paper starts from the structural parameters of cooling fan and the layout of each component of cooling fan and cooling module,studies its influence on the aerodynamic performance and internal flow field characteristics of cooling fan,and optimally designs on the basis of the original structure to improve the efficiency of cooling module.To provide theoretical guidance for engineering practice.The main research content and conclusion of this paper include the following aspects:Firstly,the working principle of the cooling fan at the power end of fracturing pump and the relevant parameters to evaluate its performance are briefly described.The status quo of the cooling fan and its matching performance with other components at home and abroad are introduced.The basic methods,governing equations and turbulence models commonly used in numerical simulation theory are introduced in detail.Secondly,the structure of the cooling fan is modeled in 3D,and the performance of the cooling fan is numerically simulated by using computational fluid dynamics software.The characteristics of the internal flow field of the fan are analyzed,and the flow-static pressure curve and flow-static pressure efficiency curve of the fan speed at 1500 rpm are measured,calculated and drawn.In addition,the CFD simulation method introduced above is used to fix the other parameters of the cooling fan and change the structural parameters of a single blade,so as to carry out numerical simulation calculations for several types of fans,and analyze the changing rules of the aerodynamic performance of the fans after different parameters are modified.Thirdly,the influences of the distance between the cooling fan and other components and the combination mode of the cooling module on the performance of the fan,the resistance characteristics of the cooling module and the characteristics of the internal flow field are discussed.The results show that: When the distance between the fan and the radiator is increased,the air flow rate gradually increases.When the distance between the fan and the engine is increased,the air flow rate distribution is more uniform,but the resistance of the heat dissipation module increases,which is mainly affected by the increase of air flow.The high temperature radiator and the low temperature radiator are arranged in series and parallel.When the two radiators are arranged in parallel,the low temperature radiator maintains the original effect,and the working medium of the high temperature radiator is reduced by about 18° compared with the series arrangement.Finally,on the basis of the analysis in the first two chapters,the structural parameters of the cooling fan are combined with the relative distance between the fan and other components.In order to increase the intake volume of the cooling air in the system and reduce the flow resistance of the cooling module,the multi-objective optimization design method is used to predict the related parameters and solve the optimal parameter combination.According to the actual working requirements,the parameters are selected as follows: the spacing between the fan and the engine is 163.1mm,the blade installation Angle is 24.1°,and the radial clearance between the fan and the air hood is 20.1mm.The results of optimization were verified and the error was found to be within the allowable range.Compared with the original structure,the optimized structure not only meets the required amount of cooling air,but also greatly reduces the flow resistance of the cooling module and improves the heat dissipation efficiency. |
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