| 摘要 |
<p>The nozzle (12, 14) has an inclination, in comparison with the horizon, with an initial angulation A, that is between 7° and 25°, usually 234°, and the cross section of the water flow passage is rectangular; in the initial part (14) it is approximately square and with a gradual lowering of the inferior surface (14A) and a gradual increase of the vertical sides of the cross-section until reaching a final inclination B, decreased by about from 6° to 8° in respect with the initial inclination.</p> |
