PPT Slide
Technology Prioritization: Selected Technology Set
Risk and Fallback for Compact Inlet Technology
- Must achieve sufficient inlet aerodynamic performance
- Low (steady state) distortion
- Low turbulence (due to rapid turning in duct surfaces)
- High pressure recovery (can be deteriorated by
separation in duct and lip losses)
- Must coordinate with engine manufacturer to account for effect
of dynamic engine fan operating line
- Perform extensive CFD analyses to identify duct designs for
- Wind tunnel test to confirm analytical results
- Utilize longer inlet duct
- Incorporate mild rates of turning (i.e., large turning radius)
Notes:
The short turning radii inherent in a compact inlet duct provides the potential for poor aerodynamic performance. Compact inlets must achieve low distortion, low turbulence, and high pressure recovery to be viable for next generation aircraft. These risks will be mitigated through extensive CFD analyses and wind tunnel testing to confirm analytical predictions. The fallback position for this technology is to implement conventional duct design philosophy by lengthening ducts and moderating turns.