Importance

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Abstract

A variable area nozzle for a turbomachine comprising, a duct 25 at least one wall of which is defined by a fixed portion 26 and two movable plates 29,30 located downstream of a downstream edge of the fixed portion 26. A first of the plates 29 is movable in a direction along the duct 25 relative to the fixed portion 26 and a second of the plates 30 is pivotally mounted at its upstream end on a downstream end of the first plate 29. An outer wall 34 surrounding the panels 29,30 extends downstream beyond the said downstream edge of the fixed portion 26. A seal plate 36 pivotally attached to the outer wall downstream of the downstream edge of the said fixed portion 26 is pivotally attached to one or more of the plates 29,30 and the seal plate 36 together with the plates 29,30 and the outer wall 34 define a pressurizable chamber 41 on that side of the plates 29,30 remote from the interior of the nozzle. Pressurized gas is admitted to the chamber 41 to counterbalance partially the loads on the panels 29,30 due to the pressure of the gases which flow through the nozzle. An actuator means 38,39 is provided to move the first plate 29 along the duct 25 and thereby cause the second plate 30 and seal plate 36 to pivot and vary the area of the nozzle. Further plates 31,37 may be provided downstream of the plates 29.

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First Claim