Hydraulic Model Study on a Special CSO Chamber

Abstract:

In order to research the siltation problem of pressurized CSO chamber with the outlet pipe elevation higher than that of the inlet pipe, a 1:5 scale model was made of plexiglass for laboratory experiments. The velocity field of the CSO chamber was measured by PIV system. VOF and DPM models were adopted in the numerical simulation, and the results were applied to the comparison and analysis with the field inspection images obtained by SONAR system. Research results show that this special CSO chamber is liable to result in siltation in dry weather flow. The deposit location and shape of sediment depend on the flow field distribution. At low flow, there is low velocity eddy zone at the central region of CSO chamber, and then there is a bulge in the middle of sediment contour line in horizontal plane. With the increase of flow, the scouring force of middle region enhances, and then the sediment contour line tends to a straight line. Furthermore, there are relatively strong scour areas at both sides of inflow which result in the trend to be flat of sediment surface. These analyses are validated by field inspection of SONAR.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 2614-2619
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.2614
• Online since: August 2013
• Authors: Yong Min Chen
• Keywords: Hydraulic Model, Numerical Simulation, Pressurized CSO Chamber, Siltation, Sonar

References

[1] Y.Y. Peng, Y.M. Chen and Y.C. Zhou: China Water & Wastewater, Vol. 27 (2011) No. 5, pp.6-8. (In Chinese).

[2] FLUENT: Fluent User's Guide(Version 6. 3) (Fluent Inc., USA 2006).

[3] M. Dufresne, J. Vazquez and A. Terfous: Computers & Fluids, Vol. 38 (2009) No. 5, pp.1042-1049.

[4] C.L. Wu, A.S. Berrouk and K. Nandakumar: Chemical Engineering Journal, Vol. 152 (2009) No. 2, pp.514-529.

[5] V.R. Stovin and A.J. Saul: J. CIWEN, Vol. 14 (2000) No. 2, pp.103-110.

[6] M. Narasimha, R. Sripriya and P.K. Banerjee: International Journal of Mineral Processing, Vol. 75 (2005) No. 1, pp.53-68.

[7] A. Adamsson, V.R. Stovin and L. Bergdahl: Journal of Environmental Engineering, Vol. 129 (2003) No. 7, pp.651-658.

[8] V.R. Stovin and A.J. Saul: Wat. Sci. Tech., Vol. 29 (1994) No. 1-2, pp.363-372.

[9] M. Ahyerre, G. Chebbo and M. Saad: Journal of Environmental Engineering, Vol. 127 (2001) No. 3, pp.233-239.

[10] H. Schlichting and K. Gersten: Boundary-layer theory (Springer, USA 2000).

[11] M. Dufresne, J. Vazquez and A. Terfous: Journal of Environmental Engineering, Vol. 135 (2009) No. 9, pp.776-787.