PREDICTION OF NOISE GENERATED BY A CABIN OUTFLOW VALVE USING THE STAR-CD CODE

摘要

Cabin comfort is a paramount concern for business aircraft design. To maintain cabin pressures at equivalent to 8000 feet above sea-level whilst flying at 45000 feet requires careful maintenance of the airflow exhausting from the cabin. This is normally achieved using a servo-controlled flap outflow valve, such as that shown in Figure 1. Unfortunately the air pressure ratio across the outflow valve can be as high as 7, so a lot of shock and screech noise can be generated as well as the jet noise from the highly separated flow behind the valve.