. Graphical and mechanical computation. DEFLECT/ON IN INCHES-BEAM FIXED AT ENDS-LOADED AT CENTER. CO/V!B/NAr/0/\/ CHART -DEFL£CT/ON OF BEAMS. Fig. 37. Another and more compact method of charting this composite equa-tion will be given in Art. 43. N VH p. 38. Specific speed of turbine and water wheel. N, = r—• The formula gives tiie specific speed of a hydraulic reaction turbine 74 NOMOGRAPHIC OR ALIGNMENT CHARTS Chap. IV Reaction Turbine and also of a tangential water wheel. Here, N^ is the specific speed, is the horsepower, N is the number of revolutions per minute, and H is the
. Graphical and mechanical computation. DEFLECT/ON IN INCHES-BEAM FIXED AT ENDS-LOADED AT CENTER. CO/V!B/NAr/0/\/ CHART -DEFL£CT/ON OF BEAMS. Fig. 37. Another and more compact method of charting this composite equa-tion will be given in Art. 43. N VH p. 38. Specific speed of turbine and water wheel. N, = r—• The formula gives tiie specific speed of a hydraulic reaction turbine 74 NOMOGRAPHIC OR ALIGNMENT CHARTS Chap. IV Reaction Turbine and also of a tangential water wheel. Here, N^ is the specific speed, is the horsepower, N is the number of revolutions per minute, and H is the head of water on turbine orwheel in ft. The formula is ex-tensively used in Hydraulicsand in water power engineeringwork; the reaction turbine isused when the head is low andthe quantity of water availableis relatively large, the value ofiVg varying from lo to lOO, whilethe tangential water wheel isused when the head is great and,as is usual in such cases, the water limited, the value of N^ y= varying from 2 to 6. Because Fig. 38a. ^f ^j^jg difference in the range of iVs for the two cases, it is best to construct separate charts. iV y/H we write the equation as -rj = ^—-, we have an equation of the form (IV), and our scales are X = miNs, y = miN, z = m^ , t = ntiH^. The following tables exhibit the choice of moduli and the equations of thescales. Reaction TurbineModulus Equation wi = X = iV, W2 = y =
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