By Dash, N.B. & Mohanty, M.K.
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Extra resources for Concepts And Applications In Agricultural Engineering Textbook Student Edition
2) Notations N = rpm of ground wheel D = diameter of ground wheel Nr = rpm of rotor d = diameter of rotor V = velocity of ground wheel n = number of cells on rotor Proof In 1 revolution rotor drops n number seeds Number of revolutions to drop 1 seed = lIn Corresponding number of revolutions of ground wheel = Nln . 3) is as follows L ~ :;" ~ ~, x~ = :. 6) ' Notations: x = number of plants required per hectare n = number of seeds per hill E emergence rate L x S = area required per each hill = plant to plant distance or hill to hill distance in a row L S = row to row distance 34 Farm MtlChinery and Power (IV) Vertical plate planter with rotor mechanism Case l:When the rotor turns in same direction as ground wheel ~ T h=%gf ~--x=vt--~ Fig.
11) Notations: V = net velocity of travel V0 = velocity of ground wheel V R = velocity of rotor, also known as peripheral velocity of rotor 9) = angle made by the seeds with vertical when striking the ground Case 2:When a rotor turns in opposite direction as ground wheel ~ Fig. 3 Sprayer and Chaff Cutter Sprayer Flow rate of spray material . 8) Notations • m = theoretical maximum capacity of chaff cutter, kglmin p = density of feed material, kg/m 3 Q = volumetric flow rate of feed material, m3/min V = linear speed of cutterhead, mlmin = linear speed of feed mechanism = rate of advance of material through throat A = cross sectional area of throat, m2 N = rotational speed of cutterhead, rpm L = theoretical length of cut, m amount of advance of feed mechanism between cuts of two consecutive knives n = number of knives on cutterhead W = width of throat = minimum width of opening at feed rolls H = height of throat, m = maximum operating clearance between upper and lower feed rolls Velocity analysis in chaff cutter V =NLn V' = 7l"D'N' Notations: V = linear speed of cutterhead V' = peripheral velocity of feed rolls D'.
5) Hydraulic jump • • • • When a given flow changes from a flow depth, h, such as h < de to a flow depth, h, such as h > de, then this phenomenon is known as hydraulic jump. Here de is known as critical depth. By this process energy due to velocity is converted into energy of elevation and some energy is lost as friction through turbulence. Hydraulic jump is made to occur within downstream portion of the structure and thus velocity is reduced to a non-erosive level in the sub-critical range. When inflow is at critical depth, then Froude number, F = 1 and h = de.
Concepts And Applications In Agricultural Engineering Textbook Student Edition by Dash, N.B. & Mohanty, M.K.