G-1 Diffusers UW Diffusers

BMI has developed a new inlet system for sampling ambient aerosol from research aircraft and for ground-based aerosol sampling. The aircraft system features:

• Two-stage diffuser assembly to decelerate 30 to 330 lpm of sample air flow from aircraft speeds of 100 m/s to 2 m/s
• Flow-characterized design using in situ hot wire anemometer measurements of air velocity and turbulence inside the cones during research flights on the DOE G-1 aircraft
• Flow characterization tests performed in the BMI Wind Tunnel at aircraft velocities
• Computer-automated isokinetic flow control with air speed, flow, pressure and temperature monitoring sensors

The BMI inlet was deployed on the G-1 during the North East Air Quality Study in July-August 2002 and during the NEAQS/ICARTT study in July-August 2004. BMI has also designed, fabricated and tested a smaller twin-diffuser assembly (30 lpm flow) for the University of Washington suite of aerosol instruments deployed within an instrument pod on the NOAA P3-D. A similar design has also been recently deployed on a Piper Cheyenne II research aircraft.

BMI maintains a high-speed wind tunnel (8" ID circular test section, 100 m/s wind speed) instrumented with pressure, temperature, pitot tube and five hot wire anemometer sensors for characterizing the fluid dynamic performance of the twin-diffuser system. A data system integrated with the wind tunnel acquires data at 1000 Hz during tests.

BMI can provide the twin-diffuser assembly alone or a completely automated and self-controlled inlet sampling system to meet your sampling requirements. Please contact us for more information.

For pricing see our price sheet.