Thermal Management And Optimized Control Design Of Aero-engine Fuel Regulation System

As an extremely important actuator part of the aero-engine control system,the main function of the aero-engine fuel regulation system is to provide the combustion chamber with different flow of pressure fuel according to the task requirements of different working states of the engine,so as to ensure the stable and reliable operation of the engine under arbitrary states.High pressure gear pump and pressurized centrifugal pump are usually used in the fuel regulation system.With the increasing demand of engine power in the future,it is necessary to design and use a large displacement gear pump in order to match the oil supply under the condition of large flow.However,there are some special working conditions,for example,in the state of high speed and low oil supply,the mechanical characteristics of gear pump lead to a large amount of redundant oil supply.Based on the control scheme of traditional pressure differential valve,metering valve and fuel return valve,the oil return directly depressurized and returned to the gear pump.When the fuel through the fuel return valve,the fuel return is transformed into heat energy along with the pressure drop.Over time,the temperature rise quickly exceeds the upper limit of the system.Therefore,it is of great significance to study the thermal temperature modeling of fuel regulation system in the context of high-power engine,and the improvement of actuator stability is more conducive to the robustness of the whole engine control system.Aiming at the above problems,this paper focuses on the research of XX engine fuel regulation system and puts forward some innovations as follows:1.In order to solve the problem of precise modeling of thermal management and aero-engine fuel regulation system,a multi-domain integrated modeling and simulation method is proposed.Specifically,the fluid software Flowmaster is combined with the algorithm development and analysis software MATLAB / Simulink to conduct joint modeling and simulation analysis.2.Aiming at the problem of the temperature exceeds the limit rapidly in the aero-engine fuel regulation system,a method is put forward to increase the inlet pressure of the gear pump by adding the jet pump.This method can reduce the pressure energy contained in the fuel flowing through the return valve to change the amplitude,reduce the work of the gear pump on the fuel,and then reduce the input power of the outside to the fuel system.3.In the process of modeling and control design of combustion control system,the equivalent PID controller modeling method of differential pressure valve is proposed.Based on the multi field joint simulation platform,intelligent group optimization algorithm is used to optimize the control parameters.According to the simulation results of multiple swarm intelligence algorithms,the performance of the optimization algorithm is comprehensively analyzed and evaluated.Finally,an algorithm is selected to adjust the parameters under multiple operating conditions.