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Active Flow Control: Enabling Next-Generation Jet Propulsion Aerodynamics
Pages 1-9

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From page 3...
... HAMSTRA AND DANIEL N MILLER Lockheed Martin Aeronautics Company Fort Worth, Texas INTRODUCTION Jet engine inlet and exhaust systems will play a major role in determining the configuration and capability of tomorrow' s military air vehicles.
From page 4...
... As combat aircraft continue to evolve, they must retain current levels of aerodynamic performance and, at the same time, become more affordable and more stealthy. These improvements will require changes in the design of inlets and exhausts; both systems will have to be shorter and more compact, simpler and lighter in terms of mechanical complexity and moving parts, and shaped to conform to the advanced, all-wing, tailless vehicle configurations of future aircraft (Figure 2~.
From page 5...
... These flow field characteristics greatly reduce net thrust and, sometimes, even result in engine stall. AFC can be used to energize/restructure the boundary layer in a way that would prevent flow separation and greatly diminish distortion.
From page 6...
... Modern exhaust systems incorporate significant complexity to provide thrust vectoring and jet area control (Bender et al., 2000; Miller and Catt, 1995; Miller et al., 1997, 1999, 2001; Vakili et al., 1999; Yagle et al., 2001~. These mechanical subsystems incur weight and cost impacts to the vehicle and limit the exhaust system to shapes that can be easily and efficiently mechanized, namely, simple round designs or simple rectangular designs.
From page 7...
... Published with permission. · Symmetric Injection To Control Jet Flow Area · Asymmetric Injection To Control Thrust Vector Angle FIGURE 4 Flow control creates "virtual surfaces" to provide classic nozzle functionality without mechanical variation.
From page 8...
... SUMMARY AFC is an emerging technology that could enable a breakthrough in traditional aerodynamic design limitations for a wide range of advanced combat aircraft systems. For the engine inlet and exhaust systems, flow-control technology has the potential to enable unprecedented freedom to incorporate exotic Towpath designs, enable optimization of engine inflow conditions regardless of aircraft condition, and provide superior exhaust system functionality with reduced weight and cost.
From page 9...
... AIAA Paper No.99-0363.


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