论文部分内容阅读
针对大型内压缩空分流程,研制出一台低温液体膨胀机用于替代高压液体节流阀,以降低空分系统能耗。液体膨胀机内部空化流动会诱发转子振动,影响运行安全。文章将多相流模型与气泡动力学Rayleigh-Plesset模型相结合,研究了液体膨胀机低温空化特性。首先模拟了低温液氮水翼流动,利用实验数据验证了空化模型和数值方法。进一步将液体膨胀机蜗壳、可调喷嘴、叶轮以及扩压管作为整体进行建模,研究了液体膨胀机两相汽化的演变机理,探明了设计流量和非设计流量下膨胀机空化特性。
For the large internal compression air separation process, developed a low-temperature liquid expander used to replace the high-pressure liquid throttle to reduce air separation system energy consumption. Liquid expander internal cavitation flow will induce rotor vibration, affecting operational safety. In this paper, the multiphase flow model is combined with the bubble dynamics Rayleigh-Plesset model to study the low-temperature cavitation characteristics of liquid expander. First, the flow of liquid nitrogen-liquid hydrofoil was simulated and the cavitation model and numerical method were verified by experimental data. Furthermore, the liquid expander volute, adjustable nozzle, impeller and diffuser tube were modeled as a whole. The evolution mechanism of two-phase vaporization of liquid expander was studied. The cavitation characteristics of expander with designed flow rate and non-designed flow rate .