Study On The Control Method Of Turbo Motor Pump Cycle In Scramjet

In order to solve the problem of auxiliary start and speed control of turbine-pump cycle scheme based on hydrocarbon fuel expansion cycle of the scramjet,this thesis designs a cycle scheme of the combined shaft of turbine,motor and pump,It’s a hybrid petrol-electric system,which can be cooled to start fuel pump,and the motor can use the conversion control pump speed between electromagnetic drive and electromagnetic braking two working modes.At the same time,in the electromagnetic braking state,it can recover the rich energy output by the turbine,charge the battery,and improve the cruising ability of the system;In addition,the fuel flow supply is controlled by coaxial motor speed regulation,and the fuel flow regulation performance is improved.This thesis mainly studies the control method of turbo-motor-pump cycle scheme through theoretical analysis and modeling simulation.The main innovation points of this thesis are:(1)design of turbo-motor pump cycle scheme;(2)motor working mode switching control algorithm;(3)Turbine fuel flow Valve opening adjustment control algorithm.This thesis discusses the feasibility and control performance differences of multiple sub-schemes around the main scheme of turbo-motor-pump circulation system,including the combination of whether the turbine fuel flow is adjustable,and the mode selection of energy dissipation resistance and flywheel energy storage to process system surplus energy.A total of " No valve opening adjustment and energy dissipation resistance version"," No valve opening adjustment and flywheel energy storage version","with valve opening adjustment and energy dissipation resistance version ","with valve opening adjustment and flywheel energy storage version " four sub-programs.In this thesis,the motor mechanical model of the system cycle dynamic process is established,the theoretical optimal motor working mode combination scheme is given,the corresponding motor working mode switching control algorithm,turbine fuel flow Valve opening adjustment control algorithm,and the PID proportional control and fuzzy control algorithm of motor speed are designed.About the simulation and analysis of the dynamic process of system cycle,the results are as follows: the four sub-schemes discussed in this paper are feasible,the speed error is controlled within 5%,the highest accuracy can be reached within 0.8%,and the SOC variation range of power supply is basically controlled between 30% and70%,and the fuzzy control has higher speed error control accuracy than PID proportional control.Compared with “No valve opening adjustment” scheme,the turbine fuel flow with valve opening regulation scheme has obvious control advantages in the later stage,that is,the speed error is smaller,and the charging and discharging cycle of power supply is longer,which is more than 20 times of that without valve opening regulation and better protects the power supply.Compared with the energy dissipation resistance scheme,the flywheel energy storage processing system surplus energy can make the overall energy recovery efficiency higher.Among them,flywheel energy storage has outstanding energy recovery effect in the turbine fuel flow with valve opening adjustment scheme.In addition,the reliability of the control algorithm in this thesis is verified by simulation test,that is,under the conditions of low power startup,large noise load,impact load and speed switching,the circulation system of turbo-motor-pump can work normally.Finally,through the comparison and analysis with pure motor-pump cycle and pure turbo-pump cycle scheme,it is concluded that the turbo motor pump cycle scheme in this thesis not only has good endurance,but also has good speed regulation performance and anti-interference performance,but also can be cold started,which has outstanding comprehensive performance among similar cycle schemes.