發(fā)布時(shí)間：2018-01-03 14:35

  本文關(guān)鍵詞：長(zhǎng)喉頸文丘里喉部取壓位置對(duì)濕氣測(cè)量模型影響的試驗(yàn)研究　出處：《機(jī)械工程學(xué)報(bào)》2014年12期 　論文類型：期刊論文

  更多相關(guān)文章： 濕氣測(cè)量 長(zhǎng)喉頸文丘里 取壓位置 虛高模型 液氣質(zhì)量比 不確定度

【摘要】：文丘里流量計(jì)廣泛應(yīng)用于濕氣流量測(cè)量領(lǐng)域。為探索長(zhǎng)喉頸文丘里管喉部取壓位置對(duì)其濕氣測(cè)量模型的影響,從理論上對(duì)其各個(gè)部分壓力降進(jìn)行研究。設(shè)計(jì)內(nèi)徑為50 mm、節(jié)流比為0.4的文丘里試驗(yàn)樣機(jī),取壓位置距離喉部入口分別為喉部直徑的0.5倍、3.75倍和7倍。在天津大學(xué)流量實(shí)驗(yàn)室雙閉環(huán)中壓濕氣裝置上進(jìn)行試驗(yàn)驗(yàn)證。試驗(yàn)壓力為0.2~0.8 MPa,干度為0.5~1。根據(jù)試驗(yàn)數(shù)據(jù),針對(duì)不同的喉部取壓位置,分析虛高梯度與L-M參數(shù)之間的關(guān)系;同時(shí)分析差壓比K參數(shù)靈敏度與液氣質(zhì)量比qml/qmg之間的關(guān)系,發(fā)現(xiàn)虛高和K參數(shù)均受喉部取壓位置的影響。建立基于K參數(shù)、Froude數(shù)、氣液密度比的虛高模型和液氣質(zhì)量比模型,通過(guò)迭代算法求出氣相和液相流量。分析基于不同取壓位置的測(cè)量模型對(duì)濕氣兩相流氣相和液相流量預(yù)測(cè)結(jié)果誤差和不確定度的影響,得出取壓位置為距離喉部入口3.75倍喉部直徑時(shí)效果最好的結(jié)論,該位置模型氣相測(cè)量不確定度為5.06%,液相為2.15%。
[Abstract]:Venturi Flowmeter is widely used in the field of moisture flow measurement. The experimental prototype of Venturi with 50 mm inner diameter and 0.4 throttle ratio is designed. The pressure position is 0.5 times of the throat diameter from the entrance of the throat. 3. 75 times and 7 times. The test was carried out on a double closed loop medium pressure wet air device in the flow Laboratory of Tianjin University. The test pressure was 0. 2 ~ 0. 8 MPa and the dryness was 0. 5 ~ 1. According to the test data. The relationship between the virtual height gradient and the L-M parameters is analyzed according to the different pressure extraction positions of the larynx. At the same time, the relationship between the sensitivity of K parameter of differential pressure ratio and the ratio of liquid to gas mass qml/qmg is analyzed. It is found that the virtual height and K parameter are affected by the pressure position of larynx, and the Froude number based on K parameter is established. The virtual height model of gas-liquid density ratio and the liquid-gas mass ratio model. The flow rate of gas phase and liquid phase is calculated by iterative algorithm, and the influence of measurement model based on different pressure position on the error and uncertainty of prediction result of gas and liquid flow in wet gas two-phase flow is analyzed. The conclusion that the pressure position is 3.75 times of laryngeal diameter from the throat entrance is the best. The uncertainty of gas phase measurement is 5.06 and the liquid phase is 2.15.
【作者單位】： 天津大學(xué)電氣與自動(dòng)化工程學(xué)院;天津大學(xué)天津市過(guò)程檢測(cè)與控制重點(diǎn)實(shí)驗(yàn)室;中國(guó)石油天然氣股份有限公司規(guī)劃總院;國(guó)家石油天然氣大流量計(jì)量站成都分站;
【基金】：國(guó)家自然科學(xué)基金(60974118) 國(guó)家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃,2007AA04Z180)資助項(xiàng)目
【分類號(hào)】：TH814
【正文快照】： 0前言濕氣作為氣液兩相流的一種特殊形態(tài),廣泛存在于自然界和工業(yè)領(lǐng)域中。ISO/TR11583[1]界定的濕氣為氣相體積分?jǐn)?shù)大于等于95%的氣液兩相流。近幾十年來(lái),由于傳統(tǒng)工業(yè)和新興工業(yè)的急速發(fā)展,對(duì)濕氣氣液兩相流的測(cè)量技術(shù)提出了越來(lái)越高的要求,同時(shí)也推動(dòng)了該項(xiàng)技術(shù)更加深入快速

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 張強(qiáng);徐英;張濤;;基于長(zhǎng)喉徑文丘里管的雙差壓濕氣流量測(cè)量[J];天津大學(xué)學(xué)報(bào);2012年02期

2 徐英;張強(qiáng);于磊;段玉晗;李濤;;利用雙差壓式節(jié)流裝置測(cè)量濕氣[J];儀器儀表學(xué)報(bào);2010年08期

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

1 方立德;盧慶華;李小亭;張計(jì)科;何青;張W，

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