Session
2024 Session 1
Location
Salt Lake Community College Westpointe Campus, Salt Lake City, UT
Start Date
5-6-2024 9:40 AM
Description
This study uses Computational Fluid Dynamics (CFD) to explore how geometric changes to centrifugal compressors impact key Two-Zone modeling parameters. While centrifugal impellers are an important part of many systems, the flow through such impellers is inherently complicated making performance often difficult to predict. There are many approaches for modeling this complex flow environment, one method being the Two-Zone model developed by Dave Japikse. This model divides all flow through a centrifugal impeller into a primary zone which is isentropic, and a secondary zone which contains losses. To apply this method, a few key parameters are needed. These parameters are difficult to measure directly on a physical test bed and, instead, must be derived from measurements that are more easily attainable. Alternatively, in this study high-fidelity CFD was used to model the flow through a centrifugal impeller, and key modeling parameters were extracted from the flow field at the outlet of the impeller. These CFD simulations were created using measured test data to ensure their accuracy. Then, changes were made to the original geometries so the impact of these changes on key modeling parameters could be determined. Results for the response of the variation in the modeling parameters χ, δ2p, and δ2s with changes in tip clearance and blade loading are presented in this study.
Extracting Meanline Modeling Parameters for Radial Turbomachinery From CFD
Salt Lake Community College Westpointe Campus, Salt Lake City, UT
This study uses Computational Fluid Dynamics (CFD) to explore how geometric changes to centrifugal compressors impact key Two-Zone modeling parameters. While centrifugal impellers are an important part of many systems, the flow through such impellers is inherently complicated making performance often difficult to predict. There are many approaches for modeling this complex flow environment, one method being the Two-Zone model developed by Dave Japikse. This model divides all flow through a centrifugal impeller into a primary zone which is isentropic, and a secondary zone which contains losses. To apply this method, a few key parameters are needed. These parameters are difficult to measure directly on a physical test bed and, instead, must be derived from measurements that are more easily attainable. Alternatively, in this study high-fidelity CFD was used to model the flow through a centrifugal impeller, and key modeling parameters were extracted from the flow field at the outlet of the impeller. These CFD simulations were created using measured test data to ensure their accuracy. Then, changes were made to the original geometries so the impact of these changes on key modeling parameters could be determined. Results for the response of the variation in the modeling parameters χ, δ2p, and δ2s with changes in tip clearance and blade loading are presented in this study.