DEAN - A program for Dynamic Engine ANalysis

Abstract

SUMMARYThe 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 csecond order Runge-Rutta, a fourth order Runge-Kutta, an Adams Predictor- LOCorrector, 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 a simple compressor rig.

Transient Behavior in Variable Geometry Industrial Gas Turbines: A Comprehensive Overview of Pertinent Modeling Techniques

“…Until now, Cranfield University kept updating this program through the postgraduate researchers. Two scientists named Sadler and Melcher [ 206 ], from NASA Lewis research center developed DEAN simulation program that was able to model overall turbofan engine and its sub systems with quite ease. It gave the opportunity to analyze the data in more details via interactive graphics.…”

“…Variety of commercial and limited use in-house built software have been employed in the literature for transient modeling and validation of the developed models, i.e., GateCycle [ 40 , 45 ], DESTUR [ 26 ], GETRAN [ 58 , 219 ], TURBOMATCH [ 51 , 220 ], AMESim [ 42 ], Thermoflow [ 7 ], DYNGEN [ 32 , 221 ]. TERTS [ 222 ], TURBOTRANS [ 223 , 224 ], and FORTRAN based programs [ 50 , 51 , 206 , 225 ].…”