计量学报
計量學報
계량학보
ACTA METROLOGICA SINICA
2010年
1期
9-13
,共5页
计量学%涡轮流量计%数值模拟%安装条件%前导流件%误差漂移
計量學%渦輪流量計%數值模擬%安裝條件%前導流件%誤差漂移
계량학%와륜류량계%수치모의%안장조건%전도류건%오차표이
Metrology%Turbine flowmeter%Numerical simulation%Installation conditions%Upstream stator%Error shift
利用数值计算方法研究了不同安装条件对涡轮流量计性能的影响.计算结果分析表明,安装于流量计前的单弯头、双弯头以及阀门等管道配件都会造成流体速度趋于扁平分布和不对称分布以及产生漩涡流,都是影响流量计计量精度的主要原因.合理布置弯头和阀门开度的方向,使流体通过两者时产生的漩涡流旋转方向相反,则有利于降低流量计进口前漩涡流的强度,减少对流量计测量精度的影响.涡轮流量计的前导流件能有效消除流体速度中的漩涡流分量,但在校正速度分布的不对称性和扁平性方面效果并不显著.
利用數值計算方法研究瞭不同安裝條件對渦輪流量計性能的影響.計算結果分析錶明,安裝于流量計前的單彎頭、雙彎頭以及閥門等管道配件都會造成流體速度趨于扁平分佈和不對稱分佈以及產生漩渦流,都是影響流量計計量精度的主要原因.閤理佈置彎頭和閥門開度的方嚮,使流體通過兩者時產生的漩渦流鏇轉方嚮相反,則有利于降低流量計進口前漩渦流的彊度,減少對流量計測量精度的影響.渦輪流量計的前導流件能有效消除流體速度中的漩渦流分量,但在校正速度分佈的不對稱性和扁平性方麵效果併不顯著.
이용수치계산방법연구료불동안장조건대와륜류량계성능적영향.계산결과분석표명,안장우류량계전적단만두、쌍만두이급벌문등관도배건도회조성류체속도추우편평분포화불대칭분포이급산생선와류,도시영향류량계계량정도적주요원인.합리포치만두화벌문개도적방향,사류체통과량자시산생적선와류선전방향상반,칙유리우강저류량계진구전선와류적강도,감소대류량계측량정도적영향.와륜류량계적전도류건능유효소제류체속도중적선와류분량,단재교정속도분포적불대칭성화편평성방면효과병불현저.
Installation effects on the performance of turbine flowmeters are investigated using numerical simulation method. Results from numerical analysis show that flow disturbances caused by pipe configurations such as single bend, out-of-plane double bends and valves may produce flat, asymmetry and swirl velocity profiles, thus leading to the meter reading error. Placing bends and valves in good locations so that swirls generated as flow pass through them rotate in contrary directions is useful to reduce the swirling intensity so as to lower installation effects on flowmeter measurement accuracy. The upstream stator shows very good performance in terms of swirl, but the flatness and asymmetry relative efficiencies are not very high.
