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

PDF Url : ADP005472

Report Date : Mar 1987

Pagination or Media Count : 18

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

Subject Categories : Aerodynamics
      Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE