Abstract
The linear plug nozzle concept has been investigated by means of analytical and experimental work. Different design approaches for annular and linear plug applications published in the literature are critically discussed. Based on earlier analytical and experimental work published by the authors, a new design methodology for linear plug nozzles with combined internal and external expansion was developed and experimentally validated. This experimental work included cold gas subscale tests performed within the frame of the German National Technology Programme LION. Complementary tests were performed within a Russian National Programme to quantify additional losses due to clustering. It is shown that depending on the contour type used, a smooth altitude mode operation can be achieved. In addition, the performance of a round-to-square nozzle used as primary expansion module is investigated.
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