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An experimental study in the near field of a turbulent round free jet
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
2014 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This work is about the study of the turbulent round jet to low Reynolds number in the outlet of a nozzle due to the countless uses in the industrial field. The objectives of the thesis are the verification of the Particle Image Velocimetry (PIV) data with other methods and authors and the analysis of the near and transition region of the flow.

The method has been divided in three parts: processing of the PIV data that has been the normalization and union of the data; validation of the PIV measurement in comparison with other related studies; and the analysis of the near and intermediate field with the known data.

Once that this part has been realized, the results and the discussion of the same have been presented. The preparation of the data has been made with a big accuracy how it has been demonstrated in the report. The verification of the PIV data has been affirmative with a big similitude for every magnitude that have been compared with other authors.

Several patterns and an equation checked have been obtained in the analysis of the potential and transition region of the turbulent flow. In the near field, a model has been found in the self-similarity turbulence intensity. In the intermediate field, the inverse streamwise mean velocity have been proved that follow a lineal function depending the parameters of the Reynolds number and nozzle geometry. Also, self-similarity streamwise velocity has evolved similar to Gaussian distribution.

Finally, an evaluation of the principal point to eddy will be development has been made. Turbulent kinetic energy and vector fields have demonstrated that vortices are created in the intersection between near and intermediate zone.

Place, publisher, year, edition, pages
2014. , 74 p.
Working paper, ISSN 1403-8757
Keyword [en]
turbulent, piv, jet
National Category
Energy Systems
URN: urn:nbn:se:hig:diva-17424OAI: diva2:741347
Subject / course
Energy systems
Educational program
Energy systems – master’s programme (one year) (swe or eng)
Available from: 2014-08-28 Created: 2014-08-27 Last updated: 2014-08-28Bibliographically approved

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