Abstract:

The two-variable control plan for twin spool turbojet engine under maximum state is discussed in this paper. The performances of the engine adopting two-variable control plan are calculated with the nonlinear simulation programs. The result of the calculation shows that engine performances with two-variable control plan are higher than those with single variable plan. There are various combination schemes of two performance parameters, while every scheme is only suitable for a use of engine. When the control plan including equal low pressure rotating lspeed and equal turbine temperature is adopted, surge margin of high pressure compressor will be reduced. A complex control plan designed in this paper may be a good way out of difficulty. At the end of the paper, some problems met in practice for two-variable control system of engine are analyzed.

Key words: control plan, two variables, performance of turbojet engine