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Fluid Mechanics and Thermodynamics of Turbomachinery, 5e

Fluid Mechanics and Thermodynamics of Turbomachinery, 5e

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(6.38)<br />

after combining with eqn. (6.33), noting that dh02/dr = 0 <strong>and</strong> that (d/dr)(rc q2) = 0 at all<br />

mass flows. From eqn. (6.37),<br />

which when substituted into eqn. (6.38) gives<br />

After rearranging,<br />

Equation (6.39) is immediately integrated in the form<br />

Three-dimensional Flows in Axial Turbomachines 193<br />

FIG. 6.7. Design <strong>and</strong> <strong>of</strong>f-design velocity triangles for a free-vortex turbine stage.<br />

(6.39)<br />

(6.40)<br />

where cx3 = cx3m at r = rm. Equation (6.40) is more conveniently expressed in a nondimensional<br />

form by introducing flow coefficients f = cx3/U m, f* = c* x3/U m <strong>and</strong> f m =<br />

cx3m/U m. Thus,

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