旋轉超音速兩相凝結流動及實驗性能研究
[Abstract]:As a new type of natural gas purification device, supersonic cyclone condenser has the advantages of compact structure, low investment cost, low energy consumption and no pollution. The lowest pressure of the gas at supersonic speed is lower than the outlet pressure, and the temperature is lower than the refrigeration temperature of the turbine expander at the same pressure ratio, and the Isentropic efficiency is high. In order to reduce pressure energy loss and make it suitable for low pressure working conditions, the structure design of supersonic condensing cyclone separator is presented in this paper. The condensation characteristics of wet gas in the nozzle, the gas-liquid two-phase flow and the methods to improve the separation performance of the device were explored. The main research work and conclusions are as follows: (1) based on the theoretical knowledge of one-dimensional isentropic flow with variable cross-section and numerical calculation software, a supersonic condensing cyclone separator suitable for lower inlet pressure is designed. The influence of structure parameters and operation parameters on the flow characteristics of the device is determined. When the inlet pressure is 0. 14 MPa, the static temperature in the nozzle expansion section is below 250K. The minimum static temperature is 231K and there is no strong shock wave in the whole unit. (2) the Euler two-fluid model of non-equilibrium spontaneous condensation flow of moist gas is established and verified, and the effects of operation parameters and structural parameters on the condensation characteristics of wet gas are studied. The results show that when the inlet / outlet pressure ratio is 1.4, the inlet temperature is 300K, the import relative humidity is 0.6, the area ratio is 1.266, The maximum diameter of droplet in nozzle is 1.12 渭 m, and the nucleation rate is 7.5 脳 1018 m3 / s. (3) the numerical model of gas-liquid two-phase flow in supersonic condensing cyclone separator is established and verified with VOF model. The interaction between liquid film and supersonic flow in nozzle is studied. The results show that the thickness of liquid film becomes thinner along the axial direction of nozzle and the surface velocity of liquid film increases gradually under the shear action of high velocity airflow. The liquid film destroys the supersonic flow state in the nozzle. (4) A supersonic condensing cyclone separation device is designed and manufactured. The experimental platform is built and the separation performance of the experimental device under different operating and structural parameters is studied. The experimental results show that the separation efficiency increases first and then decreases with increasing the inlet / outlet pressure ratio and the outlet angle of the hydrocyclone. (a) the separation performance of the (偽) type cavity is obviously better than that of the (b) type, and the separation efficiency decreases gradually with the increase of the inclined angle of the outlet cavity.
【學位授予單位】:大連理工大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TQ051.8
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