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低温潜液泵输送介质为液化天然气时,通常需要加装诱导轮来提高该类型泵第一级叶轮的进口压力,提高其抗汽蚀性能。本文基于二元流动理论进行了LNG潜液泵诱导轮的水力设计,在诱导轮叶片进口边采用后掠修圆,改善了最容易发生汽蚀的外缘进口处的抗汽蚀条件。选用RNGκ-ε模型封闭RANS方程,采用SIMPLEC算法、Mixture多相流模型与Schnerr-Sauer空化模型对设计诱导轮内流场进行了数值模拟,模拟结果显示诱导轮内发生严重空化时空泡主要分布在叶轮轮缘处,空化的发生不会大面积堵塞流道,保证了诱导轮的增压性能,验证了诱导轮水力设计方法的可行性及其优点。
When cryogenic submersible pump is liquefied natural gas, inducer should usually be installed to increase the inlet pressure of the first impeller of this type of pump and improve its anti-cavitation performance. In this paper, based on the binary flow theory, the hydraulic design of the LNG submersible pump inducer was adopted. The adoption of sweep rounding at the inlet of the inducer led to the improvement of the anti-cavitation conditions at the entrance to the outermost rim where the cavitation was most likely to occur. The RANS equation was closed by using RNGκ-ε model. The SIMPLEC algorithm, Mixture multiphase flow model and Schnerr-Sauer cavitation model were used to simulate the induced flow in the wheel. The simulation results show that the main cavitation bubbles in the induced wheel cavitation are mainly Distributed in the impeller rim, the occurrence of cavitation will not block a large area of the flow channel to ensure that the supercharger induction wheel performance, proven induction wheel hydraulic design method feasibility and advantages.