Accession Number : ADP005472

Title :   Unsteady Inlet Distortion Characteristics with the B-1B,

Corporate Author : ROCKWELL INTERNATIONAL LOS ANGELES CA NORTH AMERICAN AIRCRAFT OPERATIONS

Personal Author(s) : MacMiller,C. J. ; Haagenson,W. R.

Report Date : MAR 1987

Pagination or Media Count : 17

Abstract : An extensive wind tunnel and flight test program has been conducted to verify inlet performance and distortion characteristics on the B-1B aircraft. During the course of these investigations, several unsteady, total-pressure disturbances at various discrete frequencies were encountered: 1) Inlet duct resonance at low power settings; 2)Environmental control system precooler duct resonance; and 3) Nose gear wake ingestion. This resulted in the need to quantify these effects and assess the impact on engine stability characteristics. As a result, engine control features were modified, and aircraft configuration changes were implemented. Results and findings of these investigations are summarized.

Descriptors :   *UNSTEADY FLOW, *JET ENGINE INLETS, DISTORTION, PRESSURE DISTRIBUTION, TURBOFAN ENGINES, STALLING, STABILITY, FATIGUE(MECHANICS), RESONANCE, VARIABLE PRESSURE, AIRCRAFT ENGINE DUCTS, WAKE, INGESTION(ENGINES), WIND TUNNEL TESTS, JET BOMBERS

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines
      Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE