| As an important part of modern military,military submarine is closely related to the fate of a country and the deterrent effect of national military force on the international community,of which the power system is the most core component.In this paper,as its power source,in the case of different geometric parameters,the propulsion pump produced thrust performance problems,mainly in the following aspects:1.Influence of guide vane geometry parameters on propulsion characteristics.The dimensionless coefficients of the guide vane number and the guide vane angle.The reduce of nozzle pressure are the main factors influencing the flow rate of the fluid,the velocity increases progressively reduce the pressure on,which reflects the fact that in the process of Angle coefficient increases,spray mouth velocity makes the thrust in constant increase,it is concluded that the coefficient of leaf number is 0.0875 and blade angle coefficient is 1 time of spray pump propeller propulsion for optimal performance.The integration of two unquantized vane coefficient and guide vane envelope coefficient,the effective integration method was selected,and the integrated values were fine-tuned to integrate into a dimensionless guide vane geometric dimension coefficient.2.Influence of nozzle geometry parameters on propulsion characteristics.The geometric parameters of the nozzle were selected,and the values of the axial length of the nozzle and the diameter of the nozzle were selected.The selected parameters of the nozzle and the parameters of the guide vane selected above were combined for simulation.From the point of view of thrust and thrust coefficient efficiency curve,the change of its axial length,maximum thrust efficiency variation is only about 0.3%,while the thrust efficiency in the process of continuously reduce,but the amount of change for the thrust produced by the performance impact is not big,thrust coefficient of main influence factors for jet velocity,jet speed change quantity will be amplified in reflected in the thrust coefficient,then in advancing the efficiency coefficient of performance.The large thrust coefficient and propulsive efficiency coefficient of the nozzle speed are obviously larger,and the thrust will decrease with the decrease of the nozzle diameter.The inlet and outlet diameter and axial length of the nozzle were integrated.In the integration process,dimensionless treatment was carried out to integrate them into a variable geometric dimension coefficient of the nozzle.3.Influence of guide vane and nozzle geometric dimension coefficient on propulsion performance.When the guide vane geometry dimension coefficient and nozzle geometry dimension coefficient are taken as two independent variables,the performance parameters of the propulsion pump are taken as dependent variables to output the 3d mathematical model.Head coefficient and the efficiency of pump is the same change trend,the minimum value in the minimum nozzle geometry size and the distribution of guide vane maximize geometry size,according to the above of the influence of the geometry size coefficient of a single,while in the process of two coefficient increases,the pump efficiency has a negative impact,the diameter of the nozzle of the narrow for fluid flow in the flow components is larger,the influence of serious choke it can be to affect the whole propulsion pump outlet flow.The innovation of this paper mainly lies in the performance experiment of underwater vehicle,and then the dimensionless processing and integration of the optimized parameters of guide vane and nozzle,and then the two-dimensional curve and three-dimensional surface model are made for the integrated parameters. |
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