<p class="MsoNormal" style="margin-top: 6.0pt; text-align: justify; line-height: 150%">Aerodynamics phenomena in compressors are highly unsteady and turbulent. Selecting a proper turbulence-modeling method is of vital significance in order to reveal the complex flow mechanism in turbomachines. In the current paper, the shear stress transport (SST) model as an unsteady Reynolds-averaged Navier-Stokes method, the scale-adaptive simulation (SAS) model and the zonal wall-modeled large eddy simulation (zonal-LES) as two hybrid scale-resolving simulation approaches were selected. These turbulence-modeling methods were employed in simulating a single rotor of a low-speed research compressor featuring a tip clearance of 1.3% of chord length. Comparison was made between the simulation results and the experimental data at the design point. The results show that the zonal-LES approach brings significant improvement over both the SST model and the SAS model in capturing the experimental data, especially the velocity distribution at low span, as well as the loss at the blade tip region and the low-span region. The SAS model as a scale-resolving method presents no benefits in resolving the relevant flow compared with the SST model for this test case. Based on the quantitative analysis, the variation in predicting the loss is due to the different mechanism of each numerical approach in the aspect of simulating the entropy generation.</p>

Performance of Unsteady Reynolds-Averaged Navier-Stokes and Hybrid Scale-Resolving Simulation Approaches in Simulating a Low-Speed Axial Compressor Single Rotor

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

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