Additive Drag Of Two Dimensional Inlets
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Additive Drag of Two-Dimensional Inlets
A theoretical analysis of additive drag of two-dimensional inlets has been performed. A preliminary review of supersonic inlets provides a description of the various types of inlets, an introduction to inlet terminology and performance criteria, and the definition of additive drag. The application of geometrical streamline tracing is introduced for simple geometries as a method of determining inlet capture area ratio. The spillage from the sides of a two- dimensional inlet is treated by the method of homogeneous conical flows. This method is described and extended to determine the three-dimensional perturbation velocities within the conical flowfield. A computer program has been written to determine the shape of the streamtube captured by the inlet. In addition to tracing the streamlines, the program also numerically integrates the pressures over the streamtube to calculate the additive drag with sidespillage. The computer program has been applied to several inlet designs. Comparisons of spillage are made with experimental data. The effects of various inlet variables are considered. These variables include ramp angle, Mach number, presence of sidewalls, and leading edge sweepback.