Mechanical Engineering :: Hydraulic Machines
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By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power.The saving in case of a double acting reciprocating pump is
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In a reciprocating pump, air vessels are used to
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If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.
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A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
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By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is
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If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.
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The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)
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In a Francis turbine runner, the number of blades are generally between
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The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) ) is
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