Development of Thrust Vectoring System on a Turbojet

This paper describes the development procedure of a Thrust Vectoring Control (TVC) system model on a Turbojet engine. The work has been conducted during the col- laboration between Politecnico di Torino and Alenia Aermacchi; the cooperation has been carried out thanks to a Ph.D internship program. During the first phase of the analysis there was the need to design and develop a more detailed turbojet engine deck. The soft- ware was developed to model steady state and transient turbojet engine performances, and to handle variable RPM up to boundary conditions. It uses Matlab programming language as a modeling platform, and was validated by using various data collected through the ground test-bed and few flight tests. The modular nature of the software and the boundary condition initialization procedure allow this tool to be very flexible and customizable. Us- ing the data provided by the 1-D model, Computational Fluid Dynamics (CFD) calcula- tions were carried out. Initially a 2-D axisymmetric nozzle was modeled, in order to veri- fy the nozzle internal flow. Subsequently a 3-D model with three deflecting vanes was developed. The application of such technology on an UAV may considerably reduce the vertical tail surface, leading to a reduced radar footprint (increased stealth).