header n. 1.制造釘頭[工具頭]的人[機(jī)械]。 2.〔口語〕劊子手,斷頭機(jī);割穗機(jī)。 3.【機(jī)械工程】通水管,通汽管;集管;(鍋爐的)聯(lián)管箱。 4.【建筑】露頭磚,露頭石;半端梁擱柵。 5.〔口語〕頭朝下一跳[跌落]。 6.(足球的)頭頂球。 take a header off a ladder 從梯子上倒栽下來。
On the basis of the reptured tube at the final superheater of no . 4 boiler in yangluo power plant, the " tee junction effect " of terminal header on flux distribution in superheater was analysed, a mathematical model was founded to calculate the tube temperature and evaluate the lifespan of superheater and some measures to prevent eddy current in the area near the tee junction were put forward 摘要分析了進(jìn)口等徑三通對過熱器管流量分配的影響,建立了過熱器壁溫計算模型,并以華能陽邏電廠4號爐高溫過熱器爆管為例,對渦流效應(yīng)的大小進(jìn)行了分析,提出了消除渦流效應(yīng)的措施。