Abstract
In this paper difference in aerodynamic characteristics of open and blocked intake model of a fighter jet aircraft with diverter-less supersonic inlet (DSI) configurations have been computed and compared. Wind tunnel tests are considered necessary to augment the analysis and findings of computational or numerical design in aviation industry. However the traditional strategy of characterizing the aircraft and intake deal with them as separate entities. The wind tunnel tests for assessing aircraft aerodynamics usually uses models with streamlined fairing that blocks the intake, thereby reducing the complications in controlling the exact mass flow rates in the aircraft inlet at different flight conditions. This practice is accepted for conventional intake designs, however the same strategy must be validated for diverter-less supersonic inlet systems. For this purpose, a DSI equipped aircraft is analyzed with open intake as well as with a fairing over DSI (blocked intake model). The results of the study show that, the variation in coefficients of lift and drag are less than 1%, thus indicating a good fairing design and correspondingly, corrections required to the wind tunnels test data with fairing are not large. The conventional strategy of wind tunnel testing with fairing over the intake can be applied to aircraft with diverter less supersonic in let configurations as well.
Published Version
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