Accession Number:

ADP011108

Title:

Application of Active Core Exhaust Control to Elliminate the Core Thrust Reverser on Heavy Lift Aircraft

Descriptive Note:

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE

Personal Author(s):

• Chenault, Clarence F.
• Dorris, John D.

Report Date:

2001-06-01

Pagination or Media Count:

8.0

Abstract:

Pulsed jet blowing for mixing enhancement in a hot jet is examined using numerical simulation. Numerical simulations have been completed for a sub-scale turbojet engine a full scale ground demonstration case and a High-Bypass Ratio Engine HBRE. These simulations have shown that pulsed jet blowing can significantly reduce jet plume potential core lengths at static and forward flight conditions. The numerical scheme utilizes large timestep implicit integration for efficiency and a second order physical space algorithm for robustness. The pulsed jet disturbance is calculated directly and a turbulence model is employed to represent the cascade to smaller length scales. Experimental data corresponding to the numerical simulations are also presented and indicate similar benefits from pulsed jet mixing.

Descriptors:

• *AIRLIFT OPERATIONS
• *TURBOJET ENGINES
• *HIGH BYPASS TURBOFANS
• MATHEMATICAL MODELS
• CONTROL
• EXPERIMENTAL DATA
• OPTIMIZATION
• CORES
• SCALE MODELS
• HIGH TEMPERATURE
• NUMERICAL ANALYSIS
• TURBULENCE
• PULSES
• ENGINES
• LEVEL FLIGHT
• VERTICAL TAKEOFF AIRCRAFT
• SHORT TAKEOFF AIRCRAFT
• THRUST REVERSAL

Subject Categories:

• Aircraft
• Logistics, Military Facilities and Supplies
• Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE