Experimental Study On The Thermo-Hydraulic Behaviors Of Heated Discharge Into Steady Heterogeneous Receiving Water Area

The majority of experiment studies are concentrated in heterogeneity receiving waters and the studies are about heated discharge from circulating cooling water in Fire / nuclear power plant. Many power plants locate tidal estuary and its nearby waters, where freshwater runoff from land and sea water of high salinity converge, which appear saline intrusion phenomenon and formed non-homogeneous receiving waters of density difference. If the power plants use surface cooling method, a large number of waste water drain into the waters. Because of effect of fresh-salt water stratification, the change laws of the salt, heat flow with flow are different from general homogeneous waters. Thus, the studies are not only at the forefront topics of environmental hydraulics, but also are demands in engineering design problems about cooling water.Physical model are effective means to analyze the diffuse and transfer rule of heated into receiving water. In this paper, Combined with engineering practice of power plant, according to engineering arrangements which is surface drainage and deep intake, the thermo-hydraulic behaviors have been studied systematically by physical model in Rectangle Flume, where transverse heateddischarge flow into steady homogenization and fresh-salt water mixing water area. Studies are a part of national fund projects and the main contents include:1. Looking up more literature, understand the research methods of physical model and numerical simulation in cooling water engineering. Search the relative problems of physical model further.2. Analyze the similar principle of thermo-hydraulic behaviors, as well as the simulation outline in physical model in fresh-salt water mixing water area.3. Plan and process model, installing and debugging equipment.4. Combined with engineering practice, flow of cooling water is 800L/H and temperature rise is 10℃. Carry out experiments systematically on various flow of freshwater runoff, various depth and various salinity. The experiments include fifty three groups.5. Through systematical test of various parameters, analyze effect of gradient of salinity, water depth, freshwater runoff upon distribution of temperature rise, mixing of hot water, heat transport, buoyant jets trajectory and temperature rise of intake water.6. The results show that intake salt water increases density of heated discharge. Buoyancy effect from hot and cold water density difference is weakened and even hot water layer is concentrated in lower layer. Movement features are different from the heterogeneity water, so we pay attention to engineering arrange ments of water intake and outlet.