| 摘要 |
A method of producing a nozzle for a turbogenerator. A plurality of spiraling grooves are cut on a constant-diameter bar, the bar is tapered by cutting away part of the ridges between the grooves, a cavity is formed with the bar, the cavity is evacuated and sealed, a shroud is formed having a cavity therein, the shroud cavity is evacuated and sealed, and the bar and shroud are assembled together to form a nozzle.
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