外文翻譯--離心泵葉輪出口流量測量(中文(更新版)
【正文】 量測量 離心泵葉輪出口流量測量 SoonSam Hong, ShinHyoung Kang* School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151 742, Korea ABSTRACT： Discharge flows from a centrifugal pump impeller with a specific speed of 150 [rpm, ma/min, m] were experimentally investigated. A large axisymmetric collector instead of a volute casing was installed to obtain circumferentially uniform flow, . without interaction of the impeller and the volute. The unsteady flow was measured at the impeller exit and vaneless diffuser using a hot film probe and a pressure transducer. The flow at impeller exit showed pronounced jetwake flow patterns. The wake, which was on the suction/hub side at high flow rate, became enlarged pitchwisely on both the hub and the shroud side as the flow rate decreases. The pitchwise nonuniformity of the flow rapidly decreased along the downstream and the non uniformity almost disappeared at radius ratio of for medium flow rate. The mean vaneless diffuser flow was reasonably predicted using a one dimensional analysis when an empirical constant was used to specify the skin friction coefficient. The data can be used for a centrifugal pump impeller design and validation of CFD codes and flow modeling. 摘要： 對特定轉(zhuǎn)速為 150 [rpm, m^3/min,m]的離心泵的流量進(jìn)行了實(shí)驗(yàn)研究。這些數(shù)據(jù)可以用于離 心泵葉輪的設(shè)計(jì)，以及驗(yàn)證的 CFD 代碼和流動造型。 Inoue 和 Cumpsty (1984)測量了無葉片和帶葉片擴(kuò)散器的詳細(xì)流程。安裝了一個(gè)軸對稱的搜集室來代替螺旋式，所以流量是沿周向均勻的，除了葉片間的不穩(wěn)定。本實(shí)驗(yàn)轉(zhuǎn)速被逆變器控制，并固定在 300rpm。兩個(gè)速度組件在徑向和圓周方向上的量也被測量，因?yàn)檩S向分量被認(rèn)為非常的小。從熱膜 5 探頭或壓力換能器的非穩(wěn)態(tài)信號一起獲取的觸發(fā)信號，然后由合奏平均技術(shù)進(jìn)行數(shù)據(jù)還原。典型的噴氣尾流模式可以在圖中觀察的到，其 中示出的速度分量超過兩個(gè)葉片節(jié)距，壓力側(cè)上的徑向速度高于吸入側(cè)。進(jìn)一步的減少流量到 ?? ，會造成護(hù)罩側(cè)上的尾跡進(jìn)一步被放大。圖 9 示出了在三個(gè)流速測量的平均流量。為了查看流量變化的一般視圖，側(cè)翼流量再次變?yōu)槠骄髁?，如圖 10 所示。 圖 10 變化的平均值 (a)切向速度 (b)流動角及 (c)滑移系數(shù)： ?rr 圖 11 示出了半徑平均流量的變化，當(dāng)流速 ?? 。 Japikse(1982)使用了以下形式的皮膚摩擦系數(shù)： 5 0 . 2( 1 .8 1 0 / )fC k X R e? (1) 其中 Re 為雷諾數(shù)定義為 2/Re Cb v? 。節(jié)距方向 13 的非均勻性的流量減小是由于噴墨和尾跡在下游的混合，并且非均勻性幾乎消失在r/r2=,
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