Abstract
This report presents the results of experimental investigations into the interaction between the propellers (Ps) and the airframe of a twin-engine, twin-boom light transport aircraft with a Π-shaped tail. An analysis was performed of the forces and moments acting on the aircraft with rotating Ps. The main features of the methodology for windtunnel testing of an aircraft model with running Ps in TsAGI’s T-102 wind tunnel are outlined.The effect of 6-blade Ps slipstreams on the longitudinal and lateral aerodynamic characteristics as well as the effectiveness of the control surfaces was studied on the aircraft model in cruise and takeoff/landing configurations. The tests were conducted at flow velocities of V∞ = 20 to 50 m/s in the ranges of angles of attack α = -6 to 20 deg, sideslip angles of β = -16 to 16 deg and blade loading coefficient of B 0 to 2.8. For the aircraft of unusual layout studied, an increase in blowing intensity is shown to result in decreasing longitudinal static stability and significant asymmetry of the directional stability characteristics associated with the interaction between the Ps slipstreams of the same (left-hand) rotation and the empennage.
Highlights
The propeller slipstream and airframe interaction is one of the most important problems in the aerodynamic design of an aircraft, especially in the case of a heavily – loaded Ps [1], [2].The high efficiency of turboprop engines is a reason for their widespread applications
The use of experimental methods is the main way to study the problems of Ps and airframe interaction
The investigations of the aerodynamic characteristics of the aircraft model in cruise and takeoff/landing configurations were conducted in the ranges of angles of attack a = -6 to 20 deg, sideslip angles of b = -16 to 16 deg and loading coefficient B = 0–2.8
Summary
The propeller slipstream and airframe interaction is one of the most important problems in the aerodynamic design of an aircraft, especially in the case of a heavily – loaded Ps [1], [2]. The Ps slipstream has an essential influence on the lift and stability and controllability characteristics of an aircraft due to interaction with the wing, fuselage and empennage. The use of experimental methods is the main way to study the problems of Ps and airframe interaction. This is especially true in the case of aircraft of unusual layout with an unusual position of the engines and empennage. The main feature of the airframe is the twin-fin immersed in the Ps slipstream In this case the rudder effectiveness may be increased significantly due to the slipstream flow. The tests in TsAGI’s T-102 subsonic wind tunnel were aimed at studying the peculiarities of these effects on the aerodynamics, stability and controllability of the aircraft model in cruise and takeoff/landing configurations
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