The Experimental Study Of Gas-liquid Two-phase Ejector

Gas-liquid two-phase ejector is a kind of special jet pump with high pressure steam as the motive power. When high pressure steam goes through the steam nozzle, it will speed up and become supersonic flow. Then, this supersonic flow mixes with low pressure water and becomes supersonic two-phase flow in the mixing section. The steam condenses and the velocity decreases while the water speeds up. Afterwards, the mixture arrives at the mixing chamber throat, undergoing a condensation shock wave with a sudden rise of the water's pressure. At the end of the diffuser, the mixture can get a higher pressure than the inlet one's. The supersonic two-phase flow finally achieves that the suction water can be transfer to a higher-pressure region, where maybe a bit over than the motive pressure. The key point of this ejector is to increase the water's pressure by using the potential energy from the high pressure steam.Based upon the gas-liquid two-phase ejector mathematical model, the gas-liquid ejector performance and the structural design has been accomplished . The devices, the measuring instruments, the pipelines and disposal have been arranged, thus the gas-liquid two-phase ejector experiment set has been built. And then, based on the analysis of the experimental data, the various factors which have specific impacts on the outlet water's pressure have been studied.The mixing chamber nozzle diameter is 1.6mm, the steam nozzle diameter is 2.2mm, inlet steam pressure is 0.5MPa, and the inlet water temperature is 8℃. It shows: there's no water being sucked into the mixing chamber; The mixing chamber nozzle diameter is 1.6mm, the steam nozzle diameter is 1.0mm, inlet steam pressure is 0.5MPa, and the inlet water temperature is 8℃. It shows: there's still no water being sucked into the mixing chamber, but has the tendency of sucking water; The mixing chamber nozzle diameter is 3.1mm, the steam nozzle diameter is 2.2mm, inlet steam pressure is 0.35MPa, and the inlet water temperature is 8℃. It shows: the water is sucked and the volume in 5 second is 299.4ml, the outlet water's pressure is 0.05MPa, the outlet water's temperature is 78℃, the jet coefficient is 104.09.The outlet water's pressure has decreased with the increase of the inlet water's temperature; the outlet water's pressure can get a optimal point with the increase of the inlet steam's pressure; the less ratio (the mixing chamber nozzle diameter/ the steam nozzle diameter) the more outlet water's pressure can get. Based on the experiments, the experimental data has been analyzed and studied, and the important influential factors of the pressurize of water have been found out, so that the whole calculation model has been improved. In a word, the research improves the theory of two-phase ejector and has value in design and application of gas-liquid two-phase ejector; furthermore, it forms the basis of industrial application.