DEAN: A Program for Dynamic Engine Analysis

The Dynamic Engine Analysis program, DEAN, is a FORTRAN code implemented on the IBM/370 mainframe at NASA Lewis Research Center for digital simulation of turbofan engine dynamics. DEAN is an interactive program which allows the user to simulate engine subsystems as well as a full engine systems with relative ease. The non-linear first order ordinary differential equations which define the engine model may be solved by one of four integration schemes, a second order Runge-Rutta, a fourth order Runge-Kutta, an Adams Predictor-Corrector, or Gear's method for stiff systems. The numerical data generated by the model equations are displayed at specified intervals between which the user may choose to modify various parameters affecting the model equations and transient execution. Following the transient run, versatile graphics capabilities allow close examination of the data. DEAN's modeling procedure and capabilities are demonstrated in this paper by generating a model of simple compressor rig. (Author)