Pressure Pulse Response of High Temperature Molten Salt Check Valve Hit by Crystal Particles

doi:10.1007/s12204-023-2601-3

Abstract

Abstract: In view of the problem that crystalline particles cause wall vibration at a low temperature, based on two-phase flow model, computational fluid dynamics is used to conduct the numerical simulation of internal flows when the valve openings are 20%, 60% and 100% respectively. The molten salt flow may be changed under strict conditions and produce forced vibration of the inner parts of molten salt particle shock valve body. Euler two-phase flow model is used for different molten salt sizes to extract temporal pressure pulse information and conduct statistical data processing analysis. The influence of the molten salt crystallization of molten salt particles on the flow and pressure pulse strength is analyzed. The results show that the crystallization of molten salt has a serious impact on the vibration of the valve body, especially in the throttle rate. The valve oscillation caused by the pressure pulsation mostly occurs from the small opening rate. As the opening increases, the pressure pulse threshold and its change trend decrease.

Key words: molten salt valve, numerical simulation, pressure pulsation, two-phase flow, crystal frozen blocking

摘要： 针对熔盐回路中介质结晶产生的颗粒诱发旋启式止回阀产生的流激振动问题，基于计算流体力学方法结合欧拉两相流模型，对典型开度为20%、60%和100%的阀内流场在严苛工况下，湍流过程中不同粒径的熔盐颗粒物冲击阀内件及其阀体内壁的强迫振动进行数值模拟研究，提取时域压力脉动信息，并进行统计学数据处理分析。分析典型开度下，熔盐结晶产生熔盐颗粒对阀内流动、压力脉动强度的影响规律。结果表明，熔盐的结晶对阀体的振动有严重影响，特别是在节流速率方面。压力脉动引起的阀门振动主要发生在较小的开度，同时，随着开度增大，压力脉冲阈值和变化趋势减小。

关键词: 熔盐阀，数值模拟，压力脉动，两相流，结晶冻堵

CLC Number:

TH134

LI Shuxun (李树勋), SHEN Hengyun^* (沈珩云), LIU Bincai (刘斌才),HU Yinggang (胡迎港), MA Tingqian (马廷前). Pressure Pulse Response of High Temperature Molten Salt Check Valve Hit by Crystal Particles[J]. J Shanghai Jiaotong Univ Sci, 2024, 29(2): 271-279.

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