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A Self-Contained Captive Trajectory System for a Blowdown Wind Tunnel,

Abstract : The trajectory of a store which is released from an aircraft can be determined by model tests using a six-component sting balance to measure the aerodynamic forces and moments on the shell. This paper describes a completely self-contained Captive Trajectory System which has been configured to provide maximum efficiency in the use of wind tunnel test time. Three primary factors which contribute to achieving this goal are: the self-contained nature of the system; the use of high performance electrohydraulic servo positioning systems for all motions; and the use of a modern high speed minicomputer and appropriately matched amplifier/multiplexer I/O equipment to acquire information, perform the mathematical manipulations required, and provide appropriate inputs to the servo systems. This system contains four subsystems: the structural/mechanical system; the electrohydraulic positioning systems; the minicomputer based analyzer/programmer system; and the software system. An overview is given the wind tunnel circuit, a 4 ft x 4 ft (1.2 m x 1.2 m) trisonic blowdown which has been configured to provide high flow quality by use of a perforated sleeve valve flow control, perforated flow diffusers, acoustic baffles, a honeycomb, and screens.