Hybrid Experimental-CFD mapping approach for Twin-Entry Turbo Turbine
SAE-PP-00339
06/15/2023
- Content
- The mapping of a twin-entry turbo turbine at different ad- mission conditions in a standard gas stand test is a widely used method, but computational fluid dynamics (CFD) approach presents an opportunity for efficiency mapping of twin-entry tur- bine turbochargers, particularly for unequal admission condi- tions. This study investigates the use of CFD simulation for mapping a medium-duty twin-entry turbine turbocharger. The turbine performance solutions from the imposed flow boundary conditions in 3D flow simulations were obtained by the means of ANASYS CFX®. Measurements of turbine performance at unequal admission conditions of different speedlines and scroll pressure ratio (SPR) values were compared with CFD-generated maps with good agreements with experimental data by an aver- aged difference below 7% and 2% for the total-to-static efficiency and the mass flow parameter (MPF), respectively. Thereafter, nine SPR values ranging from 0.58 to 1.75 with the four speed- lines were simulated and the results were compared with the cor- responding SPR values measurements under the same boundary conditions in a state-of-the-art turbine interpolation and extrapo- lation algorithm - GT Power®, used in common engine simulation codes. The results from this study will advise practitioners in- volved in twin-entry turbocharger mapping as to the trade-off of experimental data vs. CFD accuracy.
- Citation
- Boye, T., "Hybrid Experimental-CFD mapping approach for Twin-Entry Turbo Turbine," SAE MobilityRxiv™ Preprint, submitted June 15, 2023, https://doi.org/10.47953/SAE-PP-00339.