TY - GEN
T1 - Comparative aerodynamic assessment of a multistage centrifugal compressor return channel based on rans and les
AU - Xu, Haosen H.A.
AU - Yang, Xiang I.A.
AU - Jariwala, Vishal
AU - Larosiliere, Louis
N1 - Funding Information:
We thank the Elliott Group for financial support. The LESs and RANs calculations are performed on PSU-ACI.
Publisher Copyright:
© 2021, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.
PY - 2021
Y1 - 2021
N2 - We report LES and RANS results of the flow in a return channel. Given the same inflow, the LESs and RANS lead to qualitatively similar but quantitatively different results up to the trailing edge of the deswirl vane and qualitatively different results from the trailing edge to the exit of the return channel. The RANS leads to strong vortical structures downstream of the deswirl guide vane. While these vortical motions are found in the LESs, they are much weaker. As a result, the RANS predicts larger variations of the swirl angle, the azimuthal velocity, and the total pressure in the span direction at the exit of the return channel than the LESs. In addition to LES and RANS in their conventional sense, we also conduct an LES on a RANS grid. By comparing the RANS-grid LES results and the LES results, we show that an LES-quality grid is an essential part of an LES.
AB - We report LES and RANS results of the flow in a return channel. Given the same inflow, the LESs and RANS lead to qualitatively similar but quantitatively different results up to the trailing edge of the deswirl vane and qualitatively different results from the trailing edge to the exit of the return channel. The RANS leads to strong vortical structures downstream of the deswirl guide vane. While these vortical motions are found in the LESs, they are much weaker. As a result, the RANS predicts larger variations of the swirl angle, the azimuthal velocity, and the total pressure in the span direction at the exit of the return channel than the LESs. In addition to LES and RANS in their conventional sense, we also conduct an LES on a RANS grid. By comparing the RANS-grid LES results and the LES results, we show that an LES-quality grid is an essential part of an LES.
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U2 - 10.2514/6.2021-0263
DO - 10.2514/6.2021-0263
M3 - Conference contribution
AN - SCOPUS:85100306922
SN - 9781624106095
T3 - AIAA Scitech 2021 Forum
SP - 1
EP - 12
BT - AIAA Scitech 2021 Forum
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
Y2 - 11 January 2021 through 15 January 2021
ER -