关键词: 航空发动机; 飞行包线; 标称点; 最大覆盖; 优化

Abstract: According to the aeroengine principle, the aeroengine efficiency of engine model are related with the total temperature and total pressure at the outlet of the inlet. And based on this trait, a general distance between two points in flight envelope was put forward. Then, the problem of dividing the flight envelope and selecting the nominal points in a flight envelope were translated into a most overlay problem as a mathematical problem. Thus, based on the general distance, a set of least number of nominal points could be found to divide the flight envelope by using optimizing method. Lastly, a flight envelope area of an inlet-aeroengine system was divided by using this optimizing method, and the coefficients, gains and singular values of aeroengine linear models at one normal point and the farmost point in its overlay area were compared. These results above indicate that this method of dividing flight envelope and selecting nominal points is proper.

Key words: Aero-engine; Flight envelop; Nominal point; Most overlay; Optimize