An experimental investigation into the flow field associated with n fully developed turbulent flow passing through a 90° mitred pipe bend is described. The results of flow visualisation in both air and water and other techniques are presented, demonstrating that the downstream secondary flow does not conform to the anticipated twin-circulatory type, but consists of a single unsteady circulation. The circulation can assume either a clockwise or an anticlockwise sense and switches between these at a low, apparently random frequency. The resultant asymmetry and unsteadiness affects the majority of the flow field and severely complicates it. A suggested reason for this behaviour is given, based on the structure of turbulent pipe flow. Details of the strongly peaked spectra and high. intensities of the fluctuating wall pressure field generated by the separation are presented.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:622975 |
| Date | January 1967 |
| Creators | Tunstall, Michael John |
| Publisher | Imperial College London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/10044/1/17599 |
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