Summary
The effects of compression and friction in the flow through the axial gap of radial-flow compressors cause considerable changes of density, viscosity and heat conductivity which result in a decrease of the leakage losses between the shaft of the impeller and the casing and which influence the volumetrical efficiency of the machine. The numerical calculation scheme which bases on implicit difference equations enables the solution of the coupled nonlinear differential equations for the flow and temperature field as well as the determination of the material properties and of the pressure distribution in the inlet region of the ring gap. The results illustrate that the leakage losses decrease considerably if more frictional heat is produced by the motion of the walls and show the importance of the conditions of the heat transfer at the walls for the aerodynamic resistance.
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Piesche, M. Numerical calculation of the laminar flow in the inlet of the axial sealing gap of radial-flow compressors. Acta Mechanica 46, 37–47 (1983). https://doi.org/10.1007/BF01176763
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DOI: https://doi.org/10.1007/BF01176763