核动力工程
覈動力工程
핵동력공정
NUCLEAR POWER ENGINEERING
2010年
1期
52-56
,共5页
小尺度%环形流道%阻力特性%计算式
小呎度%環形流道%阻力特性%計算式
소척도%배형류도%조력특성%계산식
Small scale%Annuli%Resistance characteristic%Formula
为确定小尺度环形流道间隙尺寸对流体阻力特性的影响,以水为工质,分别在滞流区和湍流区对间隙为0.540～2.685 mm的水平环形通道单相流体摩擦阻力特性进行实验研究.结果表明,小尺度环形通道的流体阻力特性与理论分析有明显的差异.摩擦系数随环形流道间隙的减小而减小,且流态转捩点较常规尺寸提前.当环形通道间隙大于2.5 mm时流体的流动特性符合常规尺寸的特性.依据实验结果,给出了窄缝环形通道的流体阻力预测式.
為確定小呎度環形流道間隙呎吋對流體阻力特性的影響,以水為工質,分彆在滯流區和湍流區對間隙為0.540～2.685 mm的水平環形通道單相流體摩抆阻力特性進行實驗研究.結果錶明,小呎度環形通道的流體阻力特性與理論分析有明顯的差異.摩抆繫數隨環形流道間隙的減小而減小,且流態轉捩點較常規呎吋提前.噹環形通道間隙大于2.5 mm時流體的流動特性符閤常規呎吋的特性.依據實驗結果,給齣瞭窄縫環形通道的流體阻力預測式.
위학정소척도배형류도간극척촌대류체조력특성적영향,이수위공질,분별재체류구화단류구대간극위0.540～2.685 mm적수평배형통도단상류체마찰조력특성진행실험연구.결과표명,소척도배형통도적류체조력특성여이론분석유명현적차이.마찰계수수배형류도간극적감소이감소,차류태전렬점교상규척촌제전.당배형통도간극대우2.5 mm시류체적류동특성부합상규척촌적특성.의거실험결과,급출료착봉배형통도적류체조력예측식.
Experimental investigations of water flow friction in horizontal annuli, with gap sizes of 0.540～2.685 mm, were carried out to determine the effect of gap sizes on the flow resistance characteristics, and the test involved the laminar and turbulent flow regimes. The results showed that of the characteristics of the fluid friction resistance of small scale annuli were obviously different with the theoretical results. The critical Reynolds number in small-scale annuli was slightly less than in normal size annul, but when the gap size is above 2.5 mm, flow resistance characteristics accord with normal size annuli. The flow resistance coef-ficient formula of narrow annuli were established based on the experiment results.
