Effect of Contraction Geometry on Hydraulic Parameters of Shock Waves

آب و خاک

Article 6, Volume 28, Issue 2, May 2014, Pages 307-318   

Document Type: Research Article

DOI: 10.22067/jsw.v0i0.21819

Authors

Mohammad Reza Nikpour^* ; Davoud Farsadi

Abstract

Formation of shock waves has an important role in supercritical flows studies. These waves are often occurring during passage of supercritical flow in the non-prismatic channels. In the present study, the effect of length and convergence of contraction wall of open-channel was investigated on hydraulic parameters of shock waves using experimental model. For achieving to this goal, values of depth and instantaneous velocity were measured in various points of shock waves observed in contractions for four Froude Numbers. The results showed that for 63% decreasing the length of contraction, the values of maximum velocity and waves height averagely increased to the amount of 23.6% and 2.77×102%, respectively. Also for the fixed length of contraction, by changing the form of walls from straight-wall to convex-wall the mentioned values averagely decreased to 6.9% and 35.2%, respectively.

Keywords

Experimental model; Instantaneous velocity; Non- prismatic channel; Supercritical flow