A correlation has been developed to calculate the influence of Reynolds and roughness effects on axial and radial turbo-compressors. The correlation uses a model of the friction factor for turbo machinery as a basis for scaling the losses with changes in roughness and Reynolds number. The friction factor model is derived from that of a flat plate, but differs from this to account for the complex 3D flows of turbomachines. The    
method considers three changes in the performance characteristic of a stage, the change of the peak efficiency, the shift in the flow coefficient at peak efficiency and the change in the pressure coefficient of the stage. The correlation is based on a measurement data evaluation of over 30 different axial and radial compressors with variation in roughness and Reynolds number. The trends of the correlation are additionally supported by evaluations of five numerically    
calculated turbo-compressor test cases and by theoretical models. The method enables the expected sensitivity of the compressor performance to Reynolds and roughness effects to be simply evaluated. It is shown that this sensitivity is primarily dependent on the design flow coefficient, and is highest for low flow coefficient radial stages, and steadily decreases as the    
design flow coefficient increases. 


Reynolds Number and Roughness Effects on Turbocompressor  Performance: Numerical Calculations and Measurement Data Evaluation

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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