【作者】 高峰；

【导师】 张天宏；

【作者基本信息】 南京航空航天大学 ， 航空宇航推进理论与工程， 2009， 硕士

【摘要】 目前微型涡喷发动机的台架试车试验中存在的问题有:燃油流量的计量精度需要提高;起动时间依然过长;没有数据终端的支持,只能依靠计算机进行外场试验不方便。本文从工程应用的角度对微压差法燃油闭环计量进行了研究,旨在提高燃油计量的精度。首先基于孔径式计量段对燃油温度、出口背压对测量的影响进行了研究,给出了流量修正系数并通过试验验证,接着对基于孔板式计量段的微压差法燃油流量测量进行了研究,通过标定试验选取合适大小的孔板,最后基于孔板式计量段进行燃油流量闭环计量实验。为了优化起动控制规律,本文开展了微型涡喷发动机台架试验。首先进行控制器旁通/上位机手动控制模式和控制器旁通/上位机自动控制模式的台架试车试验,通过试验摸索出发动机起动至慢车期间的关键控制参数,接着成功将优化后的起动控制规律移植到控制器中进行控制器自动控制模式的台架试验。在优化了起动控制规律后,进行了慢车后的燃油开环增量式控制及转速闭环控制实验。最后对发动机试验中的常见问题与解决方法进行了总结。以往的微型涡喷发动机电子控制器更改或烧写参数需要计算机与仿真器支持,经常烧写程序更改参数不但麻烦,还会降低控制器芯片寿命。本文从工程应用的角度设计并制作了微型涡喷发动机电子控制器配套数据终端。首先参考国内外资料对数据终端的需求进行了分析,接着对硬件及软件两方面各个模块进行了设计与说明,最后对数据终端进行调试验证。通过数据终端可以简化操作,通过人机界面修改各个参数,不需要计算机就可以进行发动机的手动和自动起动。更多还原

【Abstract】 At present there are still some problems in the rig test of the micro turbo engine: the precision of the fuel metering needs to be improved; the start-up time is still too long; it is inconvenient to start the engine in the field without a data terminal.From the point of engineering application, this paper studied the method of fuel metering aimed at improving the accuracy of fuel metering. First, based on the aperture metering section the paper studied the impact of fuel temperature and back pressure to the measurement, gave the flow correction factor and verified through testing. Then based on orifice plate metering section the paper studied the method of flux measurement based on the detecting of micro pressure difference. The appropriate size of the orifice was selected through calibration tests. Finally based on the orifice plate metering section the closed-loop fuel metering experiments were carried out.In order to optimize start-control law, this paper launched micro turbo engine rig tests. First of all, the controller bypass / host computer manual control mode and the controller bypass / host computer automatic control mode rig tests were carried out, the critical control parameters were worked out by these experiments. After the optimized start-control law transplanted to the controller, the controller automatic control mode rig tests were carried out. The paper also carried out the fuel incremental open-loop control and speed closed-loop control experiments after the start-control law was optimized. Finally, the common problems and solutions of the rig test were summarized.The previous electronic controllers need the help of computer and simulator to change or program the parameters. It is troubled to change the program parameters frequently, and that will also reduce the life of controller chip. From the point of engineering application, this paper designed and made the supporting data terminal of the micro turbo engine electronic controller. First referred to data at home and abroad the demand of the data terminal was analyzed, then each module of the hardware and software was designed and described, finally the data terminal was verified by debug. With the data terminal the operations can be simplified, the parameters can be modified through man-machine interface. The engine can be started by manual or automatic mode without computer.更多还原