摘要
为研究限流细长孔板阻力随孔板几何尺寸的变化规律,在高温高压条件下,以去离子水为工质,对其进行了实验研究。结果表明,质量流量一定时,孔板直径是影响阻力的决定性因素,其次是孔板长度,而与孔板相连的管道直径对阻力基本无影响。以实验数据为基础,对现有孔板阻力计算关联式进行了整理、评价,结果表明现有关联式对本文细长孔板阻力的预测精度不高,适用范围普遍较窄,且部分关联式并未考虑孔板长度对阻力的影响。基于本文实验数据,通过拟合建立了细长孔板阻力的新计算关联式,包括了孔板长度、孔板直径及雷诺数对细长孔板阻力的影响。新建立的阻力关联式具有较高的预测精度,对于长径比为5~70、入口雷诺数为1.5×105~3.0×106的限流细长孔板的阻力特性,预测精度为±15%。本研究为限流细长孔板的设计与应用提供了可靠依据。
To study the resistance characteristics of thin and long throttling orifices with change of geometric size,experimental research was carried out with deionized water under high temperature and high pressure conditions.Experimental results showed that the diameter of orifice is the decisive factor influencing resistance,and the length of orifice has a small influence on resistance;the diameter of the pipe has little influence on the resistance when the mass flow is constant.On the basis of the experimental data,evaluations of the existing orifice resistance calculation correlations were conducted.It is found that the existing correlations with narrow application ranges are not precise,and some correlations do not take the influence of orifice length on its resistance into account.Considering the influences of orifice length,orifice diameter and Reynolds number on the orifice resistance,a new correlation with higher prediction accuracy is presented.This new correlation can be used to accurately predict the resistance characteristics of the orifices with the length-to-diameter ratios between 5 and 70 and the Reynolds number between 1.5×10^5 and 3.0×10^6,providing a reliable basis for the design and application of thin and long throttling orifices.
作者
胡娟娟
李会雄
盛天佑
倪士尧
王耀东
谢恩飞
HU Juanjuan;LI Huixiong;SHENG Tianyou;NI Shiyao;WANG Yaodong;XIE Enfei(State Key Laboratory of Multiphase Flow in Power Engineering,Xi＇an Jiaotong University,Xi＇an 710049,China;China Nuclear Power Engineering Co.Ltd.,Beijing 100000,China;China Nuclear Power Design Co.Ltd.,Shenzhen,Guangdong 518000,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2018年第7期87-93,共7页
Journal of Xi'an Jiaotong University
关键词
限流细长孔板
阻力特性
长径比
关联式
thin and long throttling orifice
resistance characteristic
length-to-diameter ratio
orifice resistance correlation
