Ani ve Kademeli Kasılmalarda Histerik Davranışın Kalan Enerji ve Akış Rejimi Üzerindeki Etkisi Üzerine

In the present study, the hysteretic behavior of supercritical flow that can occur in a channel near adjacent structures, including cross-sectional contractions of the channel width, has been investigated experimentally. Three sudden contracting of 5, 10 and 15 cm and a gradual contraction of 15 cm have been used. The flow rates ranged from 250 to 600 Lit/min. These conditions are set within a laboratory flume; first there is an increase in the initial flow and then a decrease in secondary flow. The results show that by increasing and then decreasing the flowrate, two different behaviors of flow are observed with the same laboratory conditions. The results showed that with increasing the rate of sudden contracting, the values of relative depths decrease, so that in the initial flow these depths indicate a subcritical regime and in the secondary flow with the formation of hysteresis in some discharges indicate a supercritical regime. Also, hysteretic behavior increases the relative residual energy. With the sudden contraction of 15 cm, the formation of submerged hydraulic jumps resulted in a lack of hysteresis.