变截面通道内超音速两相流极限升压能力研究

根据质量、动量、能量守恒方程建立了变截面通道内超音速汽液两相流升压装置的极限升压能力计算数学模型．计算及研究表明：极限升压能力随变截面混合腔喉部直径、被升压的低压水流量和蒸汽喷嘴压比增加而降低，随环形水喷嘴间隙的变化出现了最小值；计算得出变截面超音速汽液两相流装置的极限升压能力可达26；在设计升压装置时应尽可能选取较大的蒸汽喷嘴压比和较小的环形水喷嘴间隙。同时给出了变截面混合腔喉部直径的设计原则。研究结果对变截面通道内超音速汽液两相流升压技术的应用有重要意义。

Research on the Maximum Lifting Pressure Performance of Supersonic Steam-water Two-Phase Flow in Channel of Variable Section

The mathematical model for calculation of the maximum lifting pressure performance of supersonic steam-water two-phase flow in channel of variable section is established according to the conservation equations of mass, momentum and energy. The calculation and experiment results show that the maximum lifting pressure performance decreases with the increase in throat diameter of channel of variable section, water flux of low pressure and pressure ratio of steam nozzle, and has its minimum value with water nozzle annular space. The coefficient of maximum lifting pressure performance may be as high as 26. In the design of steam injector, the larger pressure ratio of steam nozzle and the smaller water nozzle annular space are selected, the higher lifting pressure performance could be obtained. Finally the design principle is proposed for throat diameter of channel of variable section. This research could be beneficial to the application of supersonic steam-water two-phase flow in channel of variable section.