Centrifugal Pumping Machinery the Theory And Practice of Centrifugal And Turbi
Centrifugal Pumping Machinery the Theory And Practice of Centrifugal And Turbi
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Vi = radial velocity in section AI of impeller. V 2 = radial velocity in section A 2 of impeller. V 3 = velocity in section A s . V^ = velocity in suction pipe. 66 THIRD ANALYSIS OR THEORY 67 To prevent shocks and losses, an impeller must be so designed that the velocities will increase gradually in going from section A 3 to A\. The most important values required are the inner and outer vane angles, which may be determined by the following equations : F 5 = V v (1 -f- cotg a x or 5 = V C 1 r *?...fti V r- -- r, g (1-f cotgatangai) V^ h cotgatangai = - - 1. And H The angle a is usually between 70 and 83 degrees, depending somewhat upon the capacity. The absolute hydraulic efficiency to be selected is between 69 to 80 per cent, depending upon whether the pump is of the volute or diffusion type, and also upon the head, as it governs the diameter of the impeller. The angle a is such that the velocity F 5 is larger than V 2) but care must be taken that the space W\ does not, with small angles, become too small.
What to read after Centrifugal Pumping Machinery the Theory And Practice of Centrifugal And Turbi?
You can find similar books in the "Read Also" column, or choose other free books by Carl George De Laval to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Vi = radial velocity in section AI of impeller. V 2 = radial velocity in section A 2 of impeller. V 3 = velocity in section A s . V^ = velocity in suction pipe. 66 THIRD ANALYSIS OR THEORY 67 To prevent shocks and losses, an impeller must be so designed that the velocities will increase gradually in going from section A 3 to A\. The most important values required are the inner and outer vane angles, which may be determined by the following equations : F 5 = V v (1 -f- cotg a x or 5 = V C 1 r *?...fti V r- -- r, g (1-f cotgatangai) V^ h cotgatangai = - - 1. And H The angle a is usually between 70 and 83 degrees, depending somewhat upon the capacity. The absolute hydraulic efficiency to be selected is between 69 to 80 per cent, depending upon whether the pump is of the volute or diffusion type, and also upon the head, as it governs the diameter of the impeller. The angle a is such that the velocity F 5 is larger than V 2) but care must be taken that the space W\ does not, with small angles, become too small.
What to read after Centrifugal Pumping Machinery the Theory And Practice of Centrifugal And Turbi?
You can find similar books in the "Read Also" column, or choose other free books by Carl George De Laval to read onlineMoreLess
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