Experimental analysis of shock waves turbulence in contractions with rectangular sections

Formation of shock waves has an important role in supercritical flows studies. These waves often occur during passage of supercritical flow in the nonprismatic channels. In the present study, the effect of length of contraction wall of open-channel for two different geometries (1.5 m and 0.5 m) and fixed contraction ratio was investigated on hydraulic parameters of shock waves using experimental models (models 1 and 2). For achieving to this goal, values of height and instantaneous velocity were measured in various points of shock waves observed in contractions for four Froude Numbers. In general, nonuniform distribution of velocity and turbulence intensity profiles were completely clear. Comparing the results of models 1 and 2 shows that the height and velocity values of formed waves in the model 2 is so much more than that of model 1. Also, motion of the shock waves was accompanied with longitude gradient decrease of turbulence kinetic energy. The results of the present research can be very useful for design engineers.