TABLE OF CONTENTS H.Wayne Beaty [*]
Editor, Standard Handbook for Electrical Engineers
| B | = | width of distributor or height of wicket gates, in (mm) | n s | = | specific speed = |
| P | = | horsepower=0.746 kW | |||
| D | = | diameter of runner, in (mm) | P 1 | = | horsepower (kW) at 1 ft (m) head = P/H 3/2 |
| D 1 | = | diameter of runner, at centerline of guide case, in (mm) | |||
| Q | = | discharge, ft 3/s (m 3/s) | |||
| D th | = | throat diameter of runner, in (mm) | Q 1 | = | discharge at 1 ft (m) head = |
| D r | = | relative diameter of runner, in (mm) (= entrance diameter for low-speed Francis turbines; throat diameter for high-speed Francis turbines; bore of throat ring at centerline of blade for propeller turbines) | |||
| t | = | thickness, in (mm), or time, s | |||
| u | = | circumferential velocity of a point on runner, ft/s (m/s) | |||
| V | = | absolute velocity of water, ft/s (m/s) | |||
| D d | = | diameter top of draft tube, in (mm) | V u | = | tangential component of absolute velocity= V cos a |
| D p | = | pitch diameter of impulse turbine runner, in (mm) | |||
| V r | = | component of V in radial plane | |||
| d | = | jet diameter of impulse turbine, in (mm) | ? | = | velocity of water relative to runner, ft/s (m/s) |
| e | = | overall... |
