| 摘要 |
PURPOSE:To provide a superior stage efficiency over a wide range of load by a metod wherein a steam by-pass passage bypassing impulse vanes subsequent to the second rows is arranged at a circumferential area of wheel chamber corresponding to a nozzle segment opened only at a high load range. CONSTITUTION:Steam is supplied through a nozzle 1 comprising nozzle segments 5Xto 5VI arranged on its circumference and connected to each of steam adjuster valves 6 I to 6VI so as to cause rotary vanes having impulse vanes 2, 4 of the first and second rows to be rotated. The steam adjuster valves 6 I to 6VI are opened in sequence as the turbine load is increased. In this case, a steam bypass passage 7 bypassing the impulse vane 4 of the second row communicating with an outlet of the impulse vane 2 of the first row is formed at the circumferential area of the wheel chamber corresponding to the nozzle segments 5IV to 5VI into which steam flows only at the high load area. Covers 9 and 10 are arranged to hold the impulse vane 4 of the second row before and after thereof to prevent a loss of air flow. |
