排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)前(qian)段。一(yi)(yi)(yi)般(ban)(ban)車上用(yong)(yong)的(de)(de)(de)排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)大致(zhi)上是(shi)這(zhe)樣的(de)(de)(de):排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)歧管(guan)(guan)(guan)(guan)(guan)(由于(yu)溫度較(jiao)(jiao)高 一(yi)(yi)(yi)般(ban)(ban)是(shi)采用(yong)(yong)鑄鐵件(jian))裝在發動機(ji)的(de)(de)(de)缸蓋上(排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)氣(qi)(qi)(qi)(qi)門以(yi)后),然(ran)后有(you)一(yi)(yi)(yi)段減震(zhen)用(yong)(yong)的(de)(de)(de)金屬軟管(guan)(guan)(guan)(guan)(guan)(里面(mian)(mian)也是(shi)密封的(de)(de)(de)),再(zai)后面(mian)(mian)就是(shi)一(yi)(yi)(yi)根比(bi)較(jiao)(jiao)大的(de)(de)(de)直管(guan)(guan)(guan)(guan)(guan)(這(zhe)根比(bi)較(jiao)(jiao)粗(cu)大的(de)(de)(de)直管(guan)(guan)(guan)(guan)(guan)是(shi)中間的(de)(de)(de)過度管(guan)(guan)(guan)(guan)(guan),即(ji)連(lian)(lian)接(jie)排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)歧管(guan)(guan)(guan)(guan)(guan)和第(di)(di)一(yi)(yi)(yi)個(ge)消(xiao)(xiao)音(yin)器(qi)之間的(de)(de)(de)連(lian)(lian)接(jie)管(guan)(guan)(guan)(guan)(guan)。從這(zhe)里開始,排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)就是(shi)普通鋼管(guan)(guan)(guan)(guan)(guan)或(huo)鐵管(guan)(guan)(guan)(guan)(guan),但是(shi)比(bi)較(jiao)(jiao)粗(cu)大)。后面(mian)(mian)是(shi)消(xiao)(xiao)音(yin)器(qi),消(xiao)(xiao)音(yin)器(qi)是(shi)個(ge)外閉內空的(de)(de)(de)一(yi)(yi)(yi)個(ge)結構,里面(mian)(mian)為一(yi)(yi)(yi)個(ge)進(jin)氣(qi)(qi)(qi)(qi),一(yi)(yi)(yi)個(ge)排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)。進(jin)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)在消(xiao)(xiao)音(yin)器(qi)內部,有(you)很多洞(看到里面(mian)(mian)會覺得像(xiang)篩子一(yi)(yi)(yi)樣的(de)(de)(de)管(guan)(guan)(guan)(guan)(guan)子),使從發動機(ji)排(pai)(pai)(pai)進(jin)消(xiao)(xiao)音(yin)器(qi)的(de)(de)(de)氣(qi)(qi)(qi)(qi)流速(su)度降(jiang)低。使消(xiao)(xiao)音(yin)器(qi)內部形(xing)成(cheng)一(yi)(yi)(yi)個(ge)儲氣(qi)(qi)(qi)(qi)室,然(ran)后由另一(yi)(yi)(yi)只與消(xiao)(xiao)音(yin)器(qi)進(jin)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)相同(tong)(tong)的(de)(de)(de)排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)排(pai)(pai)(pai)進(jin)第(di)(di)二(er)(er)消(xiao)(xiao)音(yin)器(qi),原理同(tong)(tong)樣。經(jing)過第(di)(di)二(er)(er)節消(xiao)(xiao)音(yin)器(qi)以(yi)后,才(cai)會將廢氣(qi)(qi)(qi)(qi)排(pai)(pai)(pai)入(ru)大氣(qi)(qi)(qi)(qi)中,而排(pai)(pai)(pai)氣(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)中的(de)(de)(de)回壓,也就是(shi)靠消(xiao)(xiao)音(yin)器(qi)這(zhe)種儲氣(qi)(qi)(qi)(qi)室來(lai)形(xing)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。
奧迪 A4L是由一汽大眾公(gong)司制造并(bing)于2003年(nian)4月上市的(de)一款熱(re)門B級車型(xing)(xing),做為(wei)(wei)率先引入長軸(zhou)距(ju)和(he)渦輪(lun)概念的(de)車型(xing)(xing),從(cong)B5到B8,A4L的(de)銷量(liang)一直(zhi)經(jing)久不衰。新款A4L舍棄了淚眼設計,增加(jia)了quattro四(si)驅模式,外形更加(jia)時(shi)尚運動(dong)(dong),動(dong)(dong)力和(he)操控性更加(jia)出眾。車型(xing)(xing)內飾做工精(jing)致,科(ke)技(ji)配置豐富,空間(jian)充裕,在B級車型(xing)(xing)中擁有(you)較好的(de)實用性。一汽奧迪A4分(fen)(fen)三個排(pai)(pai)量(liang)進行銷售,分(fen)(fen)別是1.8T、2.4和(he)3.0。其中1.8T分(fen)(fen)為(wei)(wei)側(ce)影四(si)款,有(you)手動(dong)(dong)基本(ben)(ben)型(xing)(xing)、自動(dong)(dong)基本(ben)(ben)型(xing)(xing)、舒(shu)適(shi)型(xing)(xing)和(he)技(ji)術領(ling)先型(xing)(xing)。2.4排(pai)(pai)量(liang)分(fen)(fen)為(wei)(wei)三款,有(you)舒(shu)適(shi)型(xing)(xing)、舒(shu)適(shi)運動(dong)(dong)型(xing)(xing)和(he)舒(shu)適(shi)尊享型(xing)(xing)。而3.0排(pai)(pai)量(liang)只有(you)一款,并(bing)且加(jia)裝(zhuang)了quattro全時(shi)四(si)驅系統。
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