排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)前段(duan)。一(yi)般車上用(yong)的(de)(de)排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)大致(zhi)上是(shi)(shi)(shi)(shi)這(zhe)樣的(de)(de):排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)歧管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(由(you)于溫(wen)度較(jiao)高 一(yi)般是(shi)(shi)(shi)(shi)采用(yong)鑄鐵件)裝在(zai)發動(dong)機(ji)的(de)(de)缸蓋上(排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)氣(qi)(qi)(qi)(qi)門以(yi)后(hou)(hou)(hou)),然后(hou)(hou)(hou)有一(yi)段(duan)減震用(yong)的(de)(de)金屬軟(ruan)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(里(li)面(mian)也是(shi)(shi)(shi)(shi)密封的(de)(de)),再后(hou)(hou)(hou)面(mian)就是(shi)(shi)(shi)(shi)一(yi)根比(bi)(bi)較(jiao)大的(de)(de)直管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(這(zhe)根比(bi)(bi)較(jiao)粗大的(de)(de)直管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)是(shi)(shi)(shi)(shi)中間(jian)的(de)(de)過度管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan),即(ji)連(lian)接排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)歧管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)和第一(yi)個消(xiao)(xiao)(xiao)音器(qi)(qi)之間(jian)的(de)(de)連(lian)接管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)。從(cong)這(zhe)里(li)開始(shi),排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)就是(shi)(shi)(shi)(shi)普通鋼管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)或鐵管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan),但(dan)是(shi)(shi)(shi)(shi)比(bi)(bi)較(jiao)粗大)。后(hou)(hou)(hou)面(mian)是(shi)(shi)(shi)(shi)消(xiao)(xiao)(xiao)音器(qi)(qi),消(xiao)(xiao)(xiao)音器(qi)(qi)是(shi)(shi)(shi)(shi)個外閉內空的(de)(de)一(yi)個結構(gou),里(li)面(mian)為(wei)一(yi)個進(jin)氣(qi)(qi)(qi)(qi),一(yi)個排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)。進(jin)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)在(zai)消(xiao)(xiao)(xiao)音器(qi)(qi)內部(bu),有很多洞(看到里(li)面(mian)會覺(jue)得像篩子一(yi)樣的(de)(de)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)子),使從(cong)發動(dong)機(ji)排(pai)(pai)(pai)進(jin)消(xiao)(xiao)(xiao)音器(qi)(qi)的(de)(de)氣(qi)(qi)(qi)(qi)流速(su)度降低。使消(xiao)(xiao)(xiao)音器(qi)(qi)內部(bu)形成(cheng)一(yi)個儲氣(qi)(qi)(qi)(qi)室(shi),然后(hou)(hou)(hou)由(you)另一(yi)只與消(xiao)(xiao)(xiao)音器(qi)(qi)進(jin)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)相同的(de)(de)排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)排(pai)(pai)(pai)進(jin)第二(er)消(xiao)(xiao)(xiao)音器(qi)(qi),原理同樣。經過第二(er)節消(xiao)(xiao)(xiao)音器(qi)(qi)以(yi)后(hou)(hou)(hou),才會將廢(fei)氣(qi)(qi)(qi)(qi)排(pai)(pai)(pai)入大氣(qi)(qi)(qi)(qi)中,而排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)中的(de)(de)回壓,也就是(shi)(shi)(shi)(shi)靠消(xiao)(xiao)(xiao)音器(qi)(qi)這(zhe)種儲氣(qi)(qi)(qi)(qi)室(shi)來形成(cheng)。
排氣管的作用就是把廢氣從引擎燃燒室排出,其實通常人們都認為排氣越暢順越好,其實非也。引擎的排氣由于發動機的工作原理,排氣的氣浪是一波一波地排出的,大家把手放在排氣管后就可以感覺到。如果排氣管的直徑較小,那么排出氣浪的每一波都會在排氣管內部形式較大的壓力,當這一波氣浪在排氣管中開始向外排放時,對后一波氣浪就會形成一個負壓力,也就是大家所說的回壓。
這個回壓的大小決定了引擎的最佳排氣領域,如果回壓越大,引擎在低轉速的氣浪由于受前一波氣浪的影響,就會越快被前一波氣浪的負壓力吸出,也就是說排氣效果越好,但是當引擎到達高轉速時,由于排氣管的直徑較小,造成的就是排氣管內的壓力不但不能盡快吸出下一波氣浪,反而對每一波浪的排出造成了相當的阻力,而且每一波氣浪之間互相影響,造成排氣不暢順,從而降低了引擎的性能,這個時候,選用直徑較大的排氣管就會起到較好的效果。
2015年11月16日,東風小(xiao)康旗下風光370車型(xing)正式上市,新(xin)車前(qian)期率先(xian)推出三(san)款車型(xing),分別為精英(ying)型(xing)居家(jia)版、精英(ying)型(xing)旅行(xing)版和(he)尊享型(xing),采用“5+2”座椅布局(ju),均搭載1.5L發動機(ji)
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