Abstract
    Engine performance models are used throughout the life cycle of an engine from conceptual design to testing, certification and maintenance. The objective of this paper is to demonstrate the use and advantages of an engine performance model, developed using an object-oriented simulation tool, for the following applications: - Building an engine model from existing engine components and running steady state and transient calculations - Development and integration of a new cooled turbine component in the existing engine model - Accessing the engine model from an external application - Using an external legacy routine in the engine model