Was andere dazu sagen - Rezension schreiben
Es wurden keine Rezensionen gefunden.
Andere Ausgaben - Alle anzeigen
Principles of Construction and Efficiency of Water-Wheels (Classic Reprint)
Keine Leseprobe verfügbar - 2017
Principles of Construction and Efficiency of Water-Wheels
William Donaldson, (An
Keine Leseprobe verfügbar - 2015
absolute path angular velocity ascertain axis best velocity breast wheels centre centrifugal force chord circumference co-efficient of efficiency component corresponding cubic feet depth diameter direction of motion discharging side due to friction effective power developed equal to vx equation experiments fall final absolute velocity flat vane greater gross power guide blades guide-blade chamber head due head lost height due horizontal impulse wheel inches increase initial radius initial velocity inward-flow turbines jet strikes leaving friction less moving force exerted normal outward-flow turbines parallel and equal parallel-flow turbines periphery plane Poncelet power lost pressure quantity of water radial velocity radii radius vector ratio receiving side relative path remain constant revolving drum right angles sec f sluice strike the vane tail race tail water tangent theoretical undershot wheels velocity of approach vertical vis viva vx sin weight of water weir whole head
Seite 72 - ... to which, by the balancing of the contrary fluid pressures due to half the head of water and to the centrifugal force of the water in the wheel, combined with the pressure due to the ejection of the water backwards from the inner ends of the vanes of the wheel when they are curved, only one-half of the work due to the fall is spent in communicating vis viva to the water, to be afterwards taken from it during its passage through the wheel ; the remainder of the work being communicated through...
Seite 72 - ... at the circumference of the wheel, in the condition of fluid pressure. Now, with the velocity already assigned to the wheel, it is found that this fluid pressure is exactly that which is requisite to overcome the centrifugal force of the water in the wheel, and to bring the water to a state of rest at its exit ; the mechanical work due to both halves of the fall being transferred to the wheel during the combined action of the moving water and the moving wheel. In the foregoing statements, the...
Seite 8 - The object of the second law of motion is to assert that the effect produced by a force is irrespective of the previous motion of the body : it is enunciated thus : — ' When a force acts on a body in motion, the velocity it would produce in the body...