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Normal force coefficient Cz determination and flow visualization on the fin of the laser guided bomb model in the T-38 wind tunnel
Slavica Ristiĉ Dijana Dmljanoviĉ
In this paper, aerodynamic test results and boundary layer flow visualization on the fin of laser guided bomb model are presented. The test was performed in the T-38 wind tunnel. The influence of the fin position relative to the conic top of the model on aerodynamic characteristics of the fin was analyzed. Analysis was performed for three Mach numbers M∞=0.5, 0.8, 0.9, and four fin deflections d=0, 5, 10, 15°. Analysis of the influence of the two fin positions on the aerodynamic characteristics of the fin is presented by normal force coefficient and it shows that there is significant result deviation. Normal force on the fin was measured by internal three-component strain gauge balance. Aerodynamic results obtained were associated with the flow visualization results, which were performed by oil emulsion method. The presented images of flow visualization show changes of streamlines depending on the fin position and confirm the results of the aerodynamic measurement.
Key words: guided bomb, laser guided, fin, aerodynamic characteristics, aerodynamic coefficients, normal force, boundary layer, flow visualization.
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