Investigation of Flow under the Fuselage of a Powered Light Aircraft Model

摘要

The airflow under the fuselage of a scale model of the ARV Super 2 light aircraft was investigated to model the flow development in the slipstream of a propeller, particularly flow characteristics at the position of the aircraft's radiator duct. Results at simulated conditions of cruise, climb, and ground run were produced to explain cooling problems experienced in flight testing of the full size aircraft. A significant increase of static pressure across the duct is shown to occur in flight conditions, this being a probable cause of cooling inefficiency. Measurement of velocity profiles shows no evidence of effects on cooling. Flow visualization indicates propeller swirl which may also affect cooling flow by interaction with external fittings on the fuselage. The model was used to verify the choice of position for the aircraft static holes.