Effects of the existence of a centerbody on the vortex flow over a 65-deg delta wing with leading edge extension(LEX) was investigated experimentally through simultaneous off-surface visualization, wing-surface pressure and PIV measurements. The visualization and PIV measurements have captured all the essential and typical characteristics of the formation and interaction between both of the wing and LEX induced vortices. The qualitative investigation using these two techniques indicated that the effect of the centerbody existence on the vortex formation was found to be minimal at least at the experimental conditions from which the data was collected. However, the quantitative analysis of the wing-surface pressure measurements revealed the effects of centerbody existence to be prominent for the cases with the higher angles of attack and sideslip angles. Up to 24° angle of attack, the existence of the centerbody has a little influence on the suction pressure distribution of the upper wing surface of the present study even at the large sideslip angle of -20°. For the test cases with higher angles of attack of 28° and 32°, the existence of the centerbody caused a decrease in the magnitude of suction pressure distributions on both of the windward and leeward sides, and the difference of the suction pressure distribution between the two configurations increased as the magnitude of sideslip angle increased.
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