面向对象的通用航空发动机建模技术研究

针对目前发动机性能仿真中燃气热力性质计算方法适用范围和通用性差的问题,加入一种变成分的求解方法,并利用面向对象技术构建了通用的航空发动机性能仿真系统.建模中考虑了部件特性耦合、引气、冷却和功率提取等影响.同时在程序中加入了一些异常处理机制,以便于快速准确地进行调试,增强系统的可靠性.最后利用该仿真系统进行了某型双转子混排涡扇发动机的稳态特性计算,并与试验数据进行了比较.结果表明采用的变成分法进行发动机性能仿真的推力误差一般不超过3%,耗油率误差不超过2.5%,取得了良好的精度.尤其在高空小马赫数时变成分法的精度高于传统的拟合法.

Research of object-oriented general aero-engine modeling techniques

To carry out calculation of specified engine performance quickly, general aeroengine performance simulation system was built based on object-oriented technique. At the same time, a variable component method of gas thermodynamic properties for calculation was adopted to overcome the defects in the current calculation model. In the performance simulation of engine, coupling, bleeding, cooling and power extraction were considered. Moreover, debug can be achieved easily and correctly because some exception handling facilities were added into it. Thus, reliability of system was improved. A simulation of two-spool mixed turbofan engine was performed, and the results were compared with experimental data. The results show that the variable component method has good accuracy. The error of thrust is usually less than 3%, and that of specific fuel consumption is less than 2.5%. Besides the precision has improved especially at high altitude and low Mach number.