The need for proper afterbody design is on account of its13; significant influence on the net thrust and total drag of an air-craft. Achievements of such a design has become significantly difficult with ,the advent of multimission aircraft requiring variable geometry nozzle(s) operating over a broad range of conditions. In view of the complexity of flow field in the afterbody region and also due to the limitations of available semi-empirical and analytical methods,; the wind tunnel, tests are essential to get accurate quantitative results
