Application of Numerical Analysis Tools for Airframe-Propulsion Integrated Test and Evaluation

Abstract

With increasing emphasis on streamlining the acquisition process, ground-test centers like the Arnold Engineering Development Center (AEDC) are re-evaluating their roles in the development of aerospace systems. Instead of merely providing data from ground-test facilities, the new emphasis challenges AEDC to become a team member that provides knowledge for risk management and decision making during the development and operation of an aerospace system. AEDC has developed an Integrated Test and Evaluation (IT&E) approach to support aerospace system development efforts. Two primary aircraft propulsion subsystems are the inlet and the engine. Traditionally these subsystems have been designed, analyzed, and tested as isolated systems although some integrated testing has been performed. The interaction between the subsystems is modeled primarily through evaluating inlet distortion in an inlet test and then simulating this distortion in engine tests via screens or similar devices. Recently, it has been recognized that significant improvements in both performance and operability can be realized when both the inlet and the engine are designed, tested and analyzed with full knowledge of the other. To aid in the airframe-propulsion integration process, numerical solutions of the forebody-inlet and engine compression system have been coupled and partially demonstrated in a limited manner to show the potential for enhancing the acquisition process.