Active Separation Control for Improved Weapon Separation Characteristics

Period of Performance: 04/07/1999 - 05/07/2001

$831K

Phase 2 SBIR

Recipient Firm

M Technologies, Inc.
440 Horsham Road
Horsham, PA 19044
Principal Investigator

Research Topics

Abstract

The aerodynamic environment of an internal weapons bay is a dynamic, unstable, relatively unpredictable environment with bay doors open. The shear layer, the region of flow that separates the free stream flow (out-of-bay) from the flow of the bay, contains vortices that grow in thickness and intensity as it progresses downstream across the open cavity, then periodically detach from the aft edge of the cavity. Significant aeroacoustic energy is created by resonating flow within the bay cavity and from pressure instabilities within the shear layer. In supersonic flight, shock waves form on the forward and aft edges of the bay, compounding the complexity of the environment. Successful release of weapons into this environment using conventional weapon release paradigms is problematic and is exacerbated by the impending introduction of a new class of small smart weapons. In Phase I, M. Technologies and CRAFT Tech demonstrated, through the use of Computation Fluid Dynamics (CFD), that blowing of a jet normal to the cavity opening could have a significant, positive impact on the separation characteristics of the weapon bay aerodynamic environment. Phase II will involve further definition of the CFD model, supersonic wind tunnel validation of the model, and design and fabrication of a flight worthy prototype.