Variable Area Ejector-Diffuser Model Tests.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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A modular variable area ejector-diffuser was constructed and tested to establish baseline characteristics that could be used for comparison of results obtained from potential geometric reconfiguration. F404 and TF30 engines afterburning and non-afterburning modes were modeled with a scale factor of 22.1. The diffuser-ejector had a cylindrical inlet duct 3.47 inch dia. which transitioned at an LD of 1.33 to a conical section with a half angle of 8 degrees for an overall length of 24.0 inches, and with a transplanting centerbody composed of four conical sections with differing includes angles. Maximum primary mass flow and total pressure for the F404 without afterburner smallest engine modeled were 0.43 lbmsec. and 2.95 atmospheres. These same parameters for the TF30 with afterburner largest engine modeled were 1.74 lbmsec. and 2.57 atmospheres.
- Jet and Gas Turbine Engines