Fluid mechanics lab Volume (m) Time (s) Q (m3/s) 1.96E-04 2.21E-0 u) (rad/s) | D

Question

Fluid mechanics lab

Volume (m) Time (s) Q (m3/s) 1.96E-04 2.21E-0 u) (rad/s) | Deflection (rad) |Torquetheo (N·m)|Torque (N·m)|Wthe(J) 0.032 0.064 0.116 0.146 0.040 0.098 0.152 0.194 lwexp (J) Trial 1 Trial 2 76.45 67.97 Velocity (m/s) 2.50 2.81 Trial 1 1 0.0 0.015 0.015 0.42 0.159 0.127 0.065 0.009 0.178 0.134 0.063 0.009 0.0000 0.000 7.32214.639 20.580 11.648 1.987 0.000 14.609 19.916 31.335 13.074 2.326 2 115.2 3 178.0 4 214.7 0.18 0.04 0.47 0.36 0.18 31.333 0.000 0 Radius (m) Dens Cross-sectional Area (m 7.85E-05 0.065 Trial 2 1 0.0 2 148.7 3 206.3 4 251.3 48.716 Torque (Nem) vs. (rad/s) Power (W) vs. w (rad/s 30.00 0.250 20.00 0.200 0.150 10.00 Q1 theo Q1 exp A 02 theo 0.100 50.0 100.0 150.0 200.0 0.050 0.000 -0.050 0.100 10.00 300.0Linear (01 theo) -20.00 50.0 100.0 150.0 200.0 250.0 Linear (Q1 exp) Linear (02 theo) 30.00 40.00 Linear (Q2 0.150 0.200 0.250 50.00 60.00 (rad/s) w (rad/s)

Explanation / Answer

Torque vs w graph shows the relationship between the torque applied on the shaft of the Pelton turbine and the rotational speed of the turbine. The figures shows the maximum rotational speed of Pelton turbine at which torque applied on the shaft and the rotational speed decrease when the torque increase until reached the maximum torque the rotational speed becomes zero. In addition, the figures show that the maximum limits of rotational speed of the turbine and the maximum limits of torque increase when the water head and volumetric flow rate increased for every nozzle. This is because the potential energy converted to the kinetic energy, which increase the velocity of the water jet strike the bucket of the turbine causing the rotary motion of the turbine and produce the power output.

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