AFRL researchers test directed Energy Beam Improvement System

  • Published
  • By Holly Jordan
  • Air Vehicles Directorate
WRIGHT-PATTERSON AIR FORCE BASE, Ohio --  AFRL completed active flow control testing of DEBI-BATL, the Directed Energy Beam Improvement system using Binary Control for the Advanced Tactical Laser. 

The tests involved a turret model with active flow control devices installed. DEBI-BATL program efforts seek to reduce the amount of aero-optic interference surrounding an aircraft turret. "Aero-optic interference" refers to the distortion that a beam (such as a laser beam) experiences as a result of turbulent airflow around an air vehicle in flight. This interference can adversely affect communications, targeting, and other aircraft systems. Even a small distortion at the beam's source can instigate significant optical distortion over a long distance.

To help combat aero-optic interference, AFRL researchers tested the impact of active flow control devices positioned strategically on the surface of a turret model. These devices are small pulsating jets that alter the flow of air around the vehicle, suppressing turbulence. 

In this most recent test series, researchers sought to determine the optimum configuration of flow control devices for producing the maximum reduction in aero-optic interference. After placing the turret model on the sidewall of AFRL's Subsonic Aerodynamic Research Laboratory wind tunnel, they measured airflow around the turret using several methods (e.g., particle image velocimetry, hot wiring, and static and sound pressure sensing). These methods facilitate accurate determination of airflow patterns around test objects. The team tested the turret at various angles, at speeds from Mach 0.1 to Mach 0.5.

Upon successful completion of this test series, the researchers recorded their data in order to assist the AFRL and Boeing team prepare for additional testing. The upcoming test effort will measure the effectiveness of active flow control devices in controlling aero-optic distortion for high-energy laser (HEL) applications. HELs are candidates for potential integration into aircraft intended as tactical weapons, wherein minimizing aero-optic beam distortions in order to maximize weapon system effectiveness is essential.