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CONTRIBUTION TO THE THEORY OF THERMODYNAMIC SIMULATION OF COMPRESSORS (PRISPEVEK K TEORII TERMODYNAMICKEHO MODELOVANI KOMPRESORU),
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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The article defines the similitude conditions involved in the simulation of thermodynamic processes in turbine-driven machines, particularly axial compressors. These conditions were derived from differential equations of motion, from which similitude criteria were obtained which must be observed in order to keep the similarity between the simulated and the natural phenomena. When axial compressors are simulated for the same working fluid, it is necessary and sufficient that the following conditions be obeyed 1 Geometric similarity between the model and the actual system including the roughness of the blade profile in the range of Reynolds numbers usually associated with axial compressors 2 Machs similarity law 3 Reynolds similarity law 4 Observance of the boundary conditions of the problem. Theoretical and experimental analyses established that the influence of the Reynolds number can be neglected in the flow core if Re sub M Re sub crit and Re sub D Re sub crit. However, omission of the Reynolds number for the whole stage does not fit models of small dimensions, where zones of vortex flow with a high entropy gradient are predominant in such cases, the high value of Re does not justify the omission of the influence of viscosity, and the observance of the boundary conditions of the simulated phenomenon is of utmost importance. The simulation of compressors prove useful in speeding up the work and reducing the cost of research. Author
APPROVED FOR PUBLIC RELEASE