By Inc. BarCharts

Dynamics and the learn of movement.

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10a) Basic Thermodynamics, Fluid Mechanics: Definitions of Efficiency 27 which is Bernoulli’s equation. For an incompressible fluid, p is constant and eqn. 10a) becomes (2. lob) + where stagnation pressure is po = p $ p C 2 . Thus eqn. 10b) becomes + H2-H1 =O. 10c) If the fluid is a gas or vapour, the change in gravitational potential is generally negligible and eqn. (2. e. the stagnation pressure is constant (this is also true for a compressible isentropic process). Moment of momentum In dynamics much useful information is obtained by employing Newton’s second law in the form where it applies to the moments of forces.

25 m3/s develops a head of 153mm measured on a water-filled U-tube manometer. It is required to build a larger, geometrically similar fan which will deliver the same head at the same efficiency as the existing fan, but at a speed of 1440rev/min. Calculate the volume flow rate of the larger fan. 2. 2 d s . A quarter scale model has been built to obtain a check on the design and the rotational speed of the model fan is 4200rev/min. Determine the axial air velocity of the model so that dynamical similarity with the full-scale fan is preserved.

From eqn. 9547 Turbine polytropic efficiency A similar analysis to the compression process can be applied to a perfect gas expanding through an adiabatic turbine. 37) /[ 1- (;3(’7 - . 38) The derivation of these expressions is left as an exercise for the student. 9. The most notable feature of these results is that, in contrast with a compression process, for an expansion, isentropic efficiency exceeds small stage efficiency. 9. 4). 40 Fluid Mechanics, Thermodynamics of Tur6omachinery Reheat factor The foregoing relations obviously cannot be applied to steam turbines as vapours do not in general obey the gas laws.