ESDU 97029
Onedimensional representation of steady, spatially nonuniform flow. An equivalent meanvalue set for compressible flow. Part 2. Implementation for an ideal, thermallyperfect gas.
Abstract:
ESDU 97029 derives a meanvalue set for representation of a nonuniform flow of a thermallyperfect gas at a duct section. A thermodynamicallyrigorous, uniform referencemean flow is derived by extending the stagnation reservoir concept for totalstate conditions in uniform flow to nonuniform flow and requiring equality of the sectional mass flow and entropy between the nonuniform flow and a uniform referencemean flow, leading to rational definitions of the mean pressure, temperature and density. Conventional "variablec sub p" uniform flow relationships can then be applied for other properties of the referencemean flow. Rationallydefined profile factors are used to relate other sectional properties of the real flow to the referencemean flow. This new method allows for the simultaneous variation of total and static temperature and pressure across a duct section and enables the use of temperatureentropy and Mollier diagrams. It provides a correct allocation of work and irreversibilities among components of a multicomponent system so that artificial losses are not attributed upstream or downstream of the duct section. Consistent comparison with other averaging methods is possible. Several examples illustrate analytically the use of the model.Indexed under:
 Average Flow Properties
 Discharge Coefficient
 Distorted Flow
 Kinetic Energy Factor
 Mean Flow Properties
 Mollier Chart
 Onedimensional Flow
 Pipes with Internal Flow
 Profile Factors
 Static Pressure
 Static Temperature
 Total Pressure
 Total Temperature
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Data Item ESDU 97029  

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