| 摘要 |
<p>An elbow shaped draft tube (24) for a reaction hydraulic turbine has a splitter vane mounted within the draft tube that partially extends between 50 % and 80 % across the width of the draft tube to redirect flow about said elbow in the draft tube. The partial splitter vane (28) has opposing side edge surfaces spaced from the side walls of the draft tube to allow the peripheral flow to swirl around the splitter as it moves through the draft tube. The splitter vane does not result in any efficiency decrease for operating conditions below peak efficiency flow rates and still provides the full benefits at flow rates above the peak efficiency flow rate for a given head. The splitter vane results in much lower static and dynamic loads due to its smaller surface area and minimal blockage of the swirl component of the flow. A plurality of support posts (44) are embedded at one end in the draft tube and connected at the other end to position the splitter vane in non-contacting relation with the side walls of the draft tube.</p> |
