| 摘要 |
The aim of the invention is to prevent the backflow of hot primary air into the peripheral opening formed between the nozzle and the ejector of the exhaust stream of a gas turbine. For this purpose, according to the invention, said peripheral opening is partially closed to prevent the backflow of the primary flow into the engine bay. More specifically, the invention comprises a method for discharging exhaust gas from a gas turbine wherein the number of sectors, the position and the angle at the centre (C) of at least one sector (21) of the peripheral opening (1) capable of forming an area for the re-intake of the primary flow (Fp) into the engine bay (Mb) are determined by correlation of the interactions between the secondary cooling flows (Fs) and the primary flow (Fp), from the following behaviour parameters: air gyration and speed at the inlet of the nozzle (2), geometry of the exhaust stream (2, 3), routing of the secondary cooling flow (Fs) for cooling the engine bay (Mb), and the geometry and position of the inlets (E1) of the secondary flows (Fs). Said peripheral opening is then closed on the angular sector(s) (21) identified in this way.
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