Experimental and Theoretical Study of Flow Fields and Store Forces in Close Proximity to a Triple Ejection Rack at Transonic Speeds.
Final rept. Jun 79-Jun 80,
NIELSEN ENGINEERING AND RESEARCH INC MOUNTAIN VIEW CA
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A combined experimental-theoretical investigation has been made to study the flow fields and store loads in the proximity of a triple ejection rack mounted on an inboard wing pylon of an F-4C airplane. The experimental investigation, made in the 4-Foot Transonic Wind Tunnel at AEDC, included attached load measurements on models of a Mark-83 bomb with and without fins, as well as load measurements on a sting-mounted CTS model of the bottom store in the proximity of the rack. In addition, flow-field measurements were made in the proximity of the TER. Systematic data were taken in an airplane build-up sequence including additions of the wing pylon, rack, one shoulder store and two shoulder stores from M infinity equals 0.6 to 0.95. Strong interference effects were found within less than one store diameter of the rack which greatly affected the values of the attached loads. Systematic comparisons were made between experimental and the predictions of a store separation computer program for induced flow fields and store loads due to addition of the pylon, rack, and shoulder stores. For the effects of the rack and shoulder stores improvements are required in the computer program to obtain better load predictions for the store near the attached position. Specific suggestions on how to effect these improvements are made.
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