Advanced Computational Tools for Jet Interaction Phenomena

In order to develop faster, lighter, more maneuverable, and more accurate defense interceptors, jet interaction (JI) aerodynamic controls are being pursued to achieve highly effective control authority across large portions of the battlespace. The reliable use of JI to control a kill vehicle (KV) during divert maneuvers or attitude adjustments involves exploitation of the aerodynamic interactions between a jet thruster exhaust and the free stream flow over the missile. x detailed understanding of the interaction phenomena is required to properly size and place the JI control system and to design and test an effective autopilot which is capable of maneuvering to the target. The development of high performance interceptor systems which utilize optimal JI controls still presents a tremendous challenge to modern engineering practices, especially in terms of predictive analyses, testing procedures, and instrumentation. The present technological innovation will provide an advanced computational capability for the transient and steady state fluid dynamic analysis of complex interceptor configurations with fins. The improved understanding of shock/shock, shock/boundary layer, and shock/fin interactions caused by JI phenomena will enhance our ability to accurately and efficiently predict amplification factors, center-of-pressure shifts, and infrared radiance characteristics for liquid and solid divert systems. The anticipated benefits of this research will be improved predictive capabilities for JI effects which will directly impact our understanding of JI physics and its relationship to the design, testing, and integration of axial and divert propulsion systems. Commercial applications for these advanced flow analysis tools are found in the aerospace, automotive, environmental, medical, and nuclear industries.