Structural Modeling And Performance Analysis Of TBCC Combined Engine Simulation Model

The TBCC combination engine has many advantages such as the ability to start at 0 speed,work in a wide speed range,and can be used multiple times.A large number of domestic units have carried out research on combined engines,and the use of model simulation in the study of TBCC combined engines is an effective method.In this paper,by establishing a structured model of the TBCC combination engine,the Mach number upper working limit of the turbofan engine and the performance change law of the parallel-type TBCC combination engine working together are studied.According to the research requirements of this paper,the current status of TBCC combination engine simulation in various countries is analyzed,and a structured model suitable for TBCC combination engine is built.The structured model is built by the component method.Each module is highly integrated and has good scalability.For the turbine engine mode,the flow method is used to build,and the steady-state solution is solved by Newton-Raphson iterative solution.For the ramjet engine modes,two combustion modes of sub-combustion and super-combustion were established.The combined engine model is established through the distribution of the opening of the intake port.Using the structured model built,the turbine engine and the ram engine model were established respectively.The performance analysis of the variable equivalence ratio and the inlet opening of the turbine mode and the ram mode was performed,and the appropriate turbine mode afterburner throat was determined.Channel area and total afterburner temperature.The structured model was used to establish a dual-rotor turbofan engine model,and the maximum working Mach number of the turbofan engine was studied.The maximum working Mach number of turbofan engine is studied mainly by changing the temperature of the combustion chamber,variable geometry adjustment and blade guide adjustment.The equation of rotor speed is used to combine the total temperature in front of the fan with the engine characteristic parameters,and the maximum operating temperature in front of the fan under the fixed trajectory and the Mach number correspondence are used to combine the maximum working Mach number with the engine characteristic parameters.By analyzing the simulation results of the whole machine and combining the established equations,the factors restricting and affecting the maximum working Mach number of the engine are analyzed.The structured model established in this paper is used to analyze the TBCC combination engine.First,the variable Mach number of the turbine and the ram passage and the change of the inlet port opening performance are studied.The fuel consumption rate and thrust of the respective passage are analyzed.The changing rules of the parameters,then the total thrust of the combined engine is studied,and the optimization of the opening of the intake port under the restriction of different oil-gas ratios is studied,and further research on the optimal fuel distribution under the constraint of maximum thrust is carried out.