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      風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)機(ji)和(he)風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)筒(tong)(tong)(tong)的(de)(de)(de)(de)關系見(jian)圖3-360在(zai)風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)機(ji)進(jin)口(kou)有一(yi)個收縮段(duan)(duan) 將塔(ta)體和(he)風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)機(ji)相(xiang)連。收縮段(duan)(duan)后(hou)為機(ji)殼，在(zai)機(ji)殼上(shang)方接(jie)一(yi)段(duan)(duan)擴 散(san)筒(tong)(tong)(tong)，也就(jiu)是所說的(de)(de)(de)(de)風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)筒(tong)(tong)(tong)。風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)簡的(de)(de)(de)(de)作(zuo)用有二：①減(jian)小(xiao)(xiao)氣流出(chu) 口(kou)的(de)(de)(de)(de)動能(neng)損(sun)失；②減(jian)小(xiao)(xiao)或防止從(cong)冷卻塔(ta)排(pai)出(chu)的(de)(de)(de)(de)濕熱空(kong)氣，又(you)流回到塔(ta)進(jin)風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)口(kou)，重新進(jin)入塔(ta)內，以保定螺(luo)旋槳制造廠生產的(de)(de)(de)(de)直徑(jing)Q=8m的(de)(de)(de)(de)風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)機(ji)為例，4 葉片，轉(zhuan)速(su)(su)z2=149r/min,葉片角度15。,風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)G=180X 104m3/ h,全壓(ya) />=196. 13Pa(20mmH2O),功率(lv) 140kWo 過風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)凈面(mian)積 >1 — 46- 7m2,風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)速(su)(su) v= 10. 7m/s,空(kong)氣密度 1- 2kg/m3,動壓(ya) = $W = 6& 69Pa(7mmH2O)。靜壓(ya)和(he)全壓(ya)的(de)(de)(de)(de)比(bi),= 13/20 = 0.65,與前已指(zhi)出(chu)的(de)(de)(de)(de)要求相(xiang)比(bi)，顯得(de)偏小(xiao)(xiao)。改變這種情況(kuang)的(de)(de)(de)(de) 辦法就(jiu)是在(zai)風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)機(ji)上(shang)面(mian)加風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)筒(tong)(tong)(tong)，風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)筒(tong)(tong)(tong)為一(yi)個擴散(san)筒(tong)(tong)(tong)，使(shi)加風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)筒(tong)(tong)(tong)后(hou)岀(chu)塔(ta)氣流速(su)(su)度減(jian)小(xiao)(xiao)，即氣流動能(neng)損(sun)失減(jian)小(xiao)(xiao)。在(zai)電動機(ji)功率(lv) 不變的(de)(de)(de)(de)條件下，能(neng)量(liang)損(sun)失減(jian)小(xiao)(xiao)，則有效的(de)(de)(de)(de)風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)機(ji)動壓(ya)和(he)靜壓(ya)增加，風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)量(liang)增大。對于圖3-39所示的(de)(de)(de)(de)直線擴散(san)風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)筒(tong)(tong)(tong)，文獻〔11〕 中給岀(chu)了兩種圓錐角0=14。和(he)20。，不同風(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)(feng)簡高度的(de)(de)(de)(de)試驗結果，見(jian)表3-160