| 摘要 |
PURPOSE:To reduce the energy loss due to disturbance, by providing a porous board on the outer ring of a nozzle diaphragm where the secondary operating fluid will flow in while setting the hole to specific shape thereby flowing the fluid uniformly in the circumferential direction of the path section. CONSTITUTION:The primary operating fluid 11 will pass a nozzle 14 fixed by the inner ring 12 and outer ring 13 of a nozzle diaphragm and a dynamic vane 16 planted on a disc 15 and flow into the next step. While the secondary operating fluid 17 will pass through a circumferential flow path 19 formed with a casing 18 conducted with a vapor supply tube and flow into a flow path 20. Here a tubular porous board 23 is provided coaxially with the outer ring 13 where the secondary operating fluid 17 will flow in. The area of hole in the porous board 23 is made minimum at the position facing with the vapor feed tube while maximum at the opposite side. Consequently the fluid passing through said path 19 and said board 23 will flow uniformly in the circumferential direction to reduce the energy loss caused by disturbed flow. |
