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CHAPTER VI ENGINE SIMULATION IN DESIGN, OFF-DESIGN AND DYNAMIC OPERATION VI.1. Introduction A gas turbine engine goes through variable performance conditions throughout its life which include design and off-design conditions such as start-up, shutdown, load change, change of altitude, etc. Operating in the dynamic state requires changing the fuel mass flow regularly or randomly. To simulate the engine as a whole through these variable conditions, we cannot use four-dimensional space-time CFD simulations because they are too heavy and cannot run the entire engine model at once in the current computational capacities. The best alternative in this situation is a 2D space-time simulation. This type of simulation enables us to study the entire engine at the same time through variable time- dependent conditions. For this purpose, the computer code GETRAN developed by Schobeiri and described in NASA reports [30]-[32], Schobeiri’s text books [1], [5] and articles [114], [115] is used. GETRAN is a generic modular non-linear code in FORTRAN which is developed to simulate the dynamic behavior of single- and multi-spool high pressure core engines, turbofan engines, and power generation gas turbines. The theoretical background including engine structure, governing equations, and certain 113PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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