【作者】 李浩；

【导师】 李松晶； 佟志忠；

【作者基本信息】 哈尔滨工业大学 ， 机械电子工程， 2010， 硕士

【摘要】 燃油供给技术是超燃冲压发动机的关键技术之一。能按照需要,准确、稳定、快速的调节进入燃烧室的燃料量,是超燃冲压发动机获得稳定推力的基本要求。实际工作中,为了冷却发动机壁面,超燃冲压发动机采用再生主动热防护技术,即燃料在进入燃烧室之前,首先作为冷却介质经过发动机外表面对发动机壁面进行冷却,因此燃油温度被升高,燃油流量调节阀的工作条件十分恶劣。因此,为了准确、稳定、快速的调节燃油流量,以确保超燃冲压发动机的性能,研究燃油流量调节阀的设计方案、工作特性及控制方法是十分必要的。气动波纹管式燃油流量调节阀是利用高压气动伺服系统实现先导控制的锥阀式调节阀,本文将该阀等效成气动伺服阀控带弹性负载的单作用气缸,据此建立了其数学模型,得出了分别以波纹管控制腔内气体压力为输出和以阀芯位移为输出的传递函数,提出了压力闭环控制以及阀芯位移闭环控制两种控制方法。针对不同反馈形式传递函数的特点,采取不同的校正方式,并应用传统PID控制器对系统进行控制,采用Matlab的Simulink工具箱对系统进行了仿真。搭建了燃油流量调节阀试验台,进行了阀的控制特性试验,比较了压力闭环控制及阀芯位移闭环控制两种控制方法的优缺点及精度,并与仿真结果进行了比较。更多还原

【Abstract】 Fuel supply control is one of the key techniques for the development of scramjet technology. In order to generate steady thrust force, the flow rate of the fuel, which flow into the scramjet combustion chamber, should be accurately, smoothly and fastly regulated. Scramjet engine uses active cooling method for coolant system. The fuel circulates across the engine surface as coolant before going into the combustion chamber. The temperature of fuel is raised up. Hence the valve works under adverse conditions. It is necessary to study the control method about the fuel flow rate control valve to ensure the scramjet engine performencs.A pneumatic bellow-type fuel flow rate control valve is developed. The theoretical analysis and experimental investigation are carried out. Being considered as a pneumatic servo valve-controlled cylinder with elastic loads, the mathematical models of the valve are built. The transfer functions based on the bellows control pressure and spool displacement are obtained respectly. Pressure closed loop control method and spool displacement closed loop control method are presented. According to the different feedback transfer function, different correction methods are adopted. And the PID controller is used to control the system. The system simulation is carried out by matlab/simulink software. A test rig for high temperature flow rate control valve is set up and the experiment on the valve is carried out. The valve control characteristics about the pressure closed loop control and spool displacement closed loop control are obtained and compared with the simulation results.更多还原