内燃机
內燃機
내연궤
INTERNAL COMBUSTION ENGINES
2012年
4期
8-12
,共5页
柴油机%燃烧噪声%压力振荡%声学理论
柴油機%燃燒譟聲%壓力振盪%聲學理論
시유궤%연소조성%압력진탕%성학이론
diesel engine%combustion noise%pressure oscillation%acoustic theory
为研究内燃机燃烧噪声产生的机理，建立了能描述燃烧室结构特征的声模态计算模型。利用FORTRAN语言进行编程，将KIVA源程序与声一振软件SYSNOISE相结合，开展多点激励下的燃烧室燃烧压力振荡的计算。初步研究了燃烧室空腔模态及压力场的特性和变化规律。研究结果表明，燃烧室空腔模态随着发动机工作过程气体温度的急剧上升而增大，燃烧压力振荡开始于燃烧初期的预混合燃烧并随喷油提前角的增加而增大。
為研究內燃機燃燒譟聲產生的機理，建立瞭能描述燃燒室結構特徵的聲模態計算模型。利用FORTRAN語言進行編程，將KIVA源程序與聲一振軟件SYSNOISE相結閤，開展多點激勵下的燃燒室燃燒壓力振盪的計算。初步研究瞭燃燒室空腔模態及壓力場的特性和變化規律。研究結果錶明，燃燒室空腔模態隨著髮動機工作過程氣體溫度的急劇上升而增大，燃燒壓力振盪開始于燃燒初期的預混閤燃燒併隨噴油提前角的增加而增大。
위연구내연궤연소조성산생적궤리，건립료능묘술연소실결구특정적성모태계산모형。이용FORTRAN어언진행편정，장KIVA원정서여성일진연건SYSNOISE상결합，개전다점격려하적연소실연소압력진탕적계산。초보연구료연소실공강모태급압력장적특성화변화규률。연구결과표명，연소실공강모태수착발동궤공작과정기체온도적급극상승이증대，연소압력진탕개시우연소초기적예혼합연소병수분유제전각적증가이증대。
There is still no definite theory about the role because of complicacy of the acoustic wave in cylinder during combustion. Base on the characters of the chamber, an acoustic model is built. Coupled with kiva and acoustic software SYSNOISE by fortran language, the responses of pressure wave is calculated in the combustion chamber under multi-point stimulation. Preliminary studying on the pressure field＇s character is carried out. It is found that the modes of combustion chamber rise up with the chamber temperature. The results indicate that the pressure oscillation starts from the premixed combustion and the pressure rise up with the fuel injection timing.
