权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Measurement System for Sealing Performance

密封性能测量系统的开发

基本信息

批准号：
07558279
负责人：
ARITOMI Masanori
金额：
$ 4.03万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07558279/
关键词：
Fluid dynamics Molecular dynamics Molecular flow Viscous flow Choked flow Gas leakage rate Transport od radioactive materials Storage of spent fuels ガスの微小漏洩使用済燃料の中間貯蔵

项目摘要

(1) Gas leakage rates of 10^<-4> to 0.1cm^3/s from very narrow orifices and capillaries were investigated. It can be seen from the results that choked and free expansion jet flow rates from a very narrow orifice can be evaluated by the correlations used for a narmally sized orifice, and that for gas leakage rates of 10^<-4> to 0.1cm^3/s which is closely related to the sealing performance of transport casks of radioactive materials, both choked and molecular flows can be ignored but friction loss of laminar flows considering gas expansion effect governs the flow.(2) Gas leakage rates were investigated from leak paths simulated dy scratches on an O-ring surface. It is clarified from the results that their simulated leak paths including multiple leak paths can be approximated by a circular channel and by introducing the eigenvalue of leak paths (D^4/a).(3) A measurement system of gas leakage rates, which measures directly gas flow rates using a capillary as a sensor, was developed. This system can be measure the leakage flow rates of 10^<-4> to 10^<-2>cm^3/s required for the preshipment test to transport casks of radioactive materials for a short period.(4) Another measurement system of gas leakage rates, which measures pressure decreasing rates, was developed. This system can measure them simultaneously at multiple points with high accuracy,(5) The other measurement system of very small gas leakage rates less than 10^<-4>cm^3/s was developed, which exhaust gas inflowing through a narrow tube only on low temperature surface for a short period.

(1)研究了10 cm~(-4)~0.1 cm~(-3)S气体从极窄的气孔和毛细血管中的漏气率。结果表明，从一个很窄的小孔中获得的堵塞和自由膨胀射流流量可以用一个正常尺寸的小孔的关联式来估算，对于与放射性物质运输桶的密封性能密切相关的10~0.1 cm^3/S的气体泄漏率来说，堵塞和分子流都可以忽略不计，但考虑气体膨胀效应的层流流动的摩擦损失是流动的主要因素。(2)通过模拟O形环表面的刮痕泄漏路径，研究了气体泄漏率。结果表明，通过引入泄漏路径的特征值(D^4/a)，可以用一个圆形通道来近似模拟包含多个泄漏路径的气体泄漏路径。(3)研制了一种以毛细管为传感器直接测量气体流量的气体泄漏率测量系统。该系统可以测量短期运输放射性材料装船前试验所需的10^~(-4)~10^~(-2)cm~(-3)/S的泄漏流量。(4)研制了另一套气体泄漏率测量系统。该系统可多点同时测量，测量精度高。(5)研制了气体泄漏率小于10℃~(-4)cm~(-3)/S的极小气体泄漏率测量系统，使废气只在低温表面通过窄管短时间流入。