By adjusting many variable geometry components of the engine , bypass ratio can be changed during large range ( the most 0 . 25 of military fighter ) . the high specific thrust characteristic of turbojet engine and the low specific fuel consumption characteristic of the turbofan engine can be realized during different flight phase by the usage of vce technology 变几何变循环发动机是应用于第四代多用途战斗机的理想动力装置,通过多个部件几何的调节在较大范围内改变涵道比,能够使发动机在不同航段分别实现涡喷发动机的高单位推力性能和涡扇发动机的低油耗性能。
A new modeling method is applied to build the real - time mathematical model of the turbofan engine . in this model , the relations of the engine components " parameters can be expressed by analytical formula , which avoid the complex and time - consuming iterations in the components computing process 本文应用的发动机实时数学模型,提出了一种新的实时模型建模方法,该方法通过将发动机部件参数间的关系通过解析式表示,从而避免了部件计算过程中复杂而又耗时的迭代过程。
Regarding the development of control system , we studied a non - linear control method , variable structure control method , elaborating the basic concepts , methods of design and the solution of buffeting problem , modelling the linearization variable of a certain turbofan engine , for which the variable structure control system was designed and verified by a great many simulations 就控制系统设计问题,本文主要研究了一种非线性的控制方法? ?变结构控制方法。阐述了变结构控制基本概念、设计方法和抖振问题的解决,建立了某涡扇发动机线性化状态变量模型,并为其设计了变结构控制系统。最后进行大量的仿真,以验证其有效性。
In the paper , useful attempts and research on adaptive control are developed for a turbofan engine . a model reference adaptive control ( mrac ) using input and output measurements and pi adaptive law are applied to aeroengine multi - variable control system . simulation results show that controller avoids the measurement of full states variables and has good control performance 将利用输入输出测量值的模型参考自适应控制方法和比例?积分型自适应律应用于航空发动机多变量控制中,并进行了数字仿真研究,结果表明控制器有效地避免了全状态量的测量,并获得好的动、静态性能。
In arbitrary curvilinear coordinate systems , three dimensional turbulent combustion flow fields of the three kinds of turbofan engine afterburner with the longitudinal heat shield 、 outer cold flow and the jet nozzle are simulated . the three - dimensional body - fitted grids are generated by an elliptical grid generation procedure and zone method 本文在任意曲线坐标系统下对三种带有纵向隔热屏、外冷却通道和尾喷管的涡扇发动机加力燃烧室的三维紊流燃烧流场进行数值模拟。