REHEAT systems for turbo‐jet engines employ variable area convergent nozzles, and modern developments have produced nozzles made up of a series of flaps or fingers, as shown in fig. 1. These flaps have to be supported against the internal gas load to maintain a given area. The turning moment on each flap is usually balanced by a single element through a mechanical linkage; the element may take the form of a rod in tension or a shaft in torsion. This note provides a theoretical study of the nature of this load. In addition, the concept of frictional forces is introduced and a method developed for calculating the forces prevailing in flight, provided that two constants are determined from sea level test results.
Woods, W. (1961), "Pressure Forces on Variable Conical Nozzles: A Theoretical Study of Pressure and Turning Moment Distribution on Turbojet Engine Reheat Systems", Aircraft Engineering and Aerospace Technology, Vol. 33 No. 4, pp. 100-102. https://doi.org/10.1108/eb033397Download as .RIS
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