| 摘要 |
The system (6) has a gas generator connected to lateral nozzles (7) by a mobile sealing device (8), for controlling the passage of gas from the generator through the nozzles. The lateral nozzles are combined in pairs (P1-P4) so that the nozzles of the pairs are aligned on the same axis (A1) and arranged in opposition to each other. A single controllable sealing device is provided between two nozzles of each pair in association with the generator, to control the passage of gas through the nozzles in both directions. |
