微型涡轮发动机燃油闭环控制起动方法

采用微压差方法进行燃油流量测量,达到低压损、高精度和快速响应的目的.设计了孔板式计量段,对不同节流孔径的计量段进行了标定试验.试验结果表明:在设定的测量范围内,节流孔两侧压差的平方根与流量成线性关系,与理论分析结果一致.在此基础上,研究微型涡轮发动机起动过程供油流量闭环控制问题.设计了单神经元PID(比例-积分-微分)控制器,对燃油流量进行了闭环控制试验.与开环控制方法相比,新的控制方法动态性能好,调节精度高.最后,采用单神经元PID控制器进行了微型涡轮发动机燃油闭环控制起动试验,显著提高了起动过程的快速性与可靠性.

Start-up method of micro turbine engine with closed-loop fuel flowrate control

The micro pressure difference method was used to measure fuel flowrate,which has the advantages of low pressure loss,high accuracy and fast response.A new orifice measuring section was designed,and a series of calibration experiments were done with different orifices.The experiments results show that the relation between flowrate and the square root of pressure difference was linear in the flowrate measuring range,which is in accordance with theoretical analysis.On the basis of the measuring method,a single neuron PID (proportion-integration-differentiation)controller was designed and used in the closed-loop control experiments of fuel flowrate.In contrast to open-looped control,this new control method is independent of pump characteristics,power voltage and outlet pressure.It also has good dynamic performance.In the end,the method was used in MTE(micro turbine engine) starting tests,which shows that it improves the quickness and reliability of start-up process dramatically.