Rothalpy

Rothalpy PowerPoint PPT Presentation


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Conservation of Rothalpy. A cornerstone of the analysis of steady, relative flows in rotating systems has, for many years, been the immutable nature of the fluid mechanical property rothalpy."In a moving passage the rothalpy is therefore constant provided: the flow is steady in the rotating frame;

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Rothalpy

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1. Rothalpy P M V Subbarao Professor Mechanical Engineering Department

2. Conservation of Rothalpy A cornerstone of the analysis of steady, relative flows in rotating systems has, for many years, been the immutable nature of the fluid mechanical property rothalpy. "In a moving passage the rothalpy is therefore constant provided: the flow is steady in the rotating frame; no friction from the casing; there is no heat flow to or from the flow.

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12. Geometrical Details along the Third Direction True flow through a turbo-machinery is three-dimensional. Flow and tangential flow velocities are very important for better operation of a turbo-machine. The third component, which is normal to low and tangential direction is in general unwanted. This direction can better represented as blade height direction.

13. Third Direction of an Axial Flow Turbo-Machines The third direction in an axial flow machine is the radial direction. The direction of Centrifugal forces! Strong centrifugal forces are exerted by/on blades in radial direction. The centrifugal field distorts the flow velocity profiles considerably. Fluid particles tend to move outwards rather than passing along cylindrical stream surfaces as classically assumed. Particularly in tall blade (low hub: tip) ratio designs. An approach known as the radial equilibrium method, widely used for three-dimensional design calculations in a an axial flow machine.

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