迷宫型节流件压降的数值模拟研究  

Numerical Analysis on Pressure Drop of the Labyrinth Throttle

作　　者：宋怡 陆道纲[1] 秦亥琦 钟达文[1] 曹琼[1] SONG Yi;LU Dangang;QIN Haiqi;ZHONG Dawen;CAO Qiong(Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学非能动核能安全技术重点实验室,北京102206

出　　处：《核科学与工程》2020年第2期316-324,共9页Nuclear Science and Engineering

摘　　要：迷宫型节流件能够在小空间内实现大压降,因此被广泛应用于钠冷快堆的管道系统中。当选择迷宫型节流件时,在设计过程中评估它的压降是非常有必要的。评估压降通常采用的方法是实验测量,但是实验不仅费时费力,而且难以观察流动细节,近年来,数值模拟已经成为评估压降的常用方法。数值模拟更加便捷,但同时它的准确性受很多因素影响,尤其是湍流模型的选择。另一方面,迷宫型节流件的压降是由很多因素决定的,包括相邻节流板的间距、节流板的高度、节流板的数目和流过节流件的流量。目前关于迷宫型节流件的压降和这些因素之间的关系尚不明确。基于上述认识,本文研究了计算迷宫型节流件压降的数值模拟方法,并且通过数值模拟结果与实验结果的对比,选择了标准k-ε模型为最可信的湍流模型。本文使用经过验证的数值模拟方法,分析了迷宫型节流件的压降随各种因素变化的趋势,最终通过多元回归方法拟合了压降与其各影响因素之间关系的经验公式。Due to its ability to achieve large pressure drop in a small space,labyrinth throttle is well used in the primary cooling system of a sodium-cooled fast reactor to adjust pressure drop.For selection of labyrinth throttle in design,it is necessary to evaluate the pressure drop.Usually the pressure drop is determined by experiment,but it is a time-consuming work.Flow information also cannot be obtained during experiment due to the restriction of measure conditions.As a result,recently numerical simulation becomes a common method for calculation of the pressure drop.Although numerical method is very convenient,its accuracy is affected by many factors,especially the choice of turbulence models.Numerical results have rarely been validated by experiments.On the other hand,pressure drop of labyrinth throttle is determined by various factors,including distance between adjacent plates,height of each plate,number of plates and mass flow rate.Relationship between pressure drop and these factors is still unknown.Based on above recognition,a numerical modeling was studied for simulating the pressure drop,where standard k-ε was selected as the most reliable model via comparison between numerical results and experimental ones.Using the validated numerical modeling,hydraulic characteristics of the labyrinth throttle varying with various factors were analyzed.Empirical formulas for pressure drop changing with these factors were fitted by multiple regression method consequently.

关 键 词：迷宫型节流件 压降 数值模拟 湍流模型 多元回归方法 

分 类 号：TL353[核科学技术—核技术及应用]