摘要
通过对微型涡喷发动机试验台的搭建,实现了对其运行时重要参数的测量。为了稳定、准确地实现对燃油流量的控制,以解决起动控制过程中的超温问题,采用步进电机带动齿轮泵的方法去供油,通过控制转速间接控制流量,从而实现了流量准、响应迅速的开环燃油流量控制。通过对对象发动机进行大量的起动特性摸底试验,结合试验数据对控制时序优化,最终整合得出某型微型涡喷发动机地面起动控制时序。通过采用此方法供油,严格按照控制时序进行起动控制试验,结果表明,在保证发动机能够迅速可靠地完成起动过程的前提下,燃烧室出口、涡轮后及尾喷管出口的最高温度明显降低;燃烧室出口温度、涡轮后温度及尾喷管出口温度上升更快,到达峰值时间提前,且峰值更小。这种方法不仅解决了起动超温问题,还可以缩短发动机的起动时间。通过试验对起动控制时序的研究,为微型涡喷发动机的起动控制建立了有效的研究方法,对该型发动机的控制具有重要的工程应用价值。
The important parameters of the micro turbo engine are measured by setting up the experimental bench.In order to control the fuel flow stably and accurately to solve the over-temperature problem in the starting control process,a stepper motor is used to drive a gear pump to supply fuel,and indirectly controls the flow by controlling the speed,so as to realize the open-loop fuel flow control with accurate flow and quick response.Through a large number of basic tests on the starting characteristics of the target engine,combined with the optimization of control timing sequence based on the experimental data,the time sequence of ground starting control of a certain type of micro turbo engine is obtained through integration.By adopting this method to supply oil,the starting control experiment is carried out in strict accordance with the control sequence.The results show that,under the premise that the engine can complete the starting process quickly and reliably,the maximum temperature at the exit of combustor,behind the turbine and at the exit of the exhaust nozzle decreases obviously.Combustor outlet temperature,turbine outlet temperature and nozzle outlet temperature rise faster,reach the peak time earlier,and the peak is lower.It not only solves the problem of starting over temperature,but also shortens the starting time of the engine.The study of the start control sequence through experiments establishes an effective research method for the start control of the micro turbo engine,which has important engineering application value for the control of the engine.
作者
彭鸿博
杨创
于军力
冯远
Peng Hongbo;Yang Chuang;Yu Junli;Feng Yuan(Civil Aviation University of China,Tianjin 300300,China)
出处
《航空科学技术》
2021年第7期21-26,共6页
Aeronautical Science & Technology
基金
中央高校基本科研业务费(3122016C0)。
关键词
微型涡喷发动机
试验台
起动超温
燃油控制
试验技术
micro turbo engine
test bench
starting over temperature
fuel control
test technique
