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SWIRLING FLOW FORMATIONS IN CIRCULAR CHANNELS

Bruschewski, Martin and Scherhag, Christian and Grundmann, Sven and Schiffer, Heinz-Peter (2014):
SWIRLING FLOW FORMATIONS IN CIRCULAR CHANNELS.
In: 10th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements, Marbella, Spain, [Conference or Workshop Item]

Abstract

The presented work discusses the topology of swirling flows in circular channels. A comprehensive parameter study is conducted with the objective to investigate the sensitivity of such flows to geometric and fluid mechanic parameters. The swirling flow system in this study consists of a straight tube of large lengthto- diameter ratio with a tangential-type swirl generator at the bottom and a specified outlet at the opposite exit. The study was carried out with the novel measurement technique Phase-Contrast Magnetic Resonance Imaging, which in combination with Laser Doppler Anemometry allowed the time-efficient measuring of more than 70 parameter combinations. The investigated flows are categorized in sub-critical and supercritical states. One major outcome is the finding of a swirling flow that is remarkably robust although it is a sub-critical flow by definition. This flow formation is characterized by a distinctive three-zone axial velocity profile which in this form has not been reported yet in the literature. The corresponding Reynolds number and swirl strength lie within the technical relevant range. Due to its robustness and applicability, the flow is easy to reproduce and therefore ideally suited as a test case for subsequent studies, such as for the validation of numerical codes.

Item Type: Conference or Workshop Item
Erschienen: 2014
Creators: Bruschewski, Martin and Scherhag, Christian and Grundmann, Sven and Schiffer, Heinz-Peter
Title: SWIRLING FLOW FORMATIONS IN CIRCULAR CHANNELS
Language: English
Abstract:

The presented work discusses the topology of swirling flows in circular channels. A comprehensive parameter study is conducted with the objective to investigate the sensitivity of such flows to geometric and fluid mechanic parameters. The swirling flow system in this study consists of a straight tube of large lengthto- diameter ratio with a tangential-type swirl generator at the bottom and a specified outlet at the opposite exit. The study was carried out with the novel measurement technique Phase-Contrast Magnetic Resonance Imaging, which in combination with Laser Doppler Anemometry allowed the time-efficient measuring of more than 70 parameter combinations. The investigated flows are categorized in sub-critical and supercritical states. One major outcome is the finding of a swirling flow that is remarkably robust although it is a sub-critical flow by definition. This flow formation is characterized by a distinctive three-zone axial velocity profile which in this form has not been reported yet in the literature. The corresponding Reynolds number and swirl strength lie within the technical relevant range. Due to its robustness and applicability, the flow is easy to reproduce and therefore ideally suited as a test case for subsequent studies, such as for the validation of numerical codes.

Divisions: 16 Department of Mechanical Engineering > Institute of Gas Turbines and Aerospace Propulsion (GLR)
16 Department of Mechanical Engineering
Event Title: 10th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements
Event Location: Marbella, Spain
Date Deposited: 05 Apr 2018 09:32
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