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基于分形理論的雙燃料發(fā)動(dòng)機(jī)Nox排放模擬計(jì)算
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    摘要:

    在雙區(qū)噴霧卷吸模型的基礎(chǔ)上，建立了一個(gè)基于皺折火焰面分形理論的雙燃料發(fā)動(dòng)機(jī)準(zhǔn)維模型，來描述雙燃料發(fā)動(dòng)機(jī)氣缸內(nèi)的湍流燃燒、火焰?zhèn)鞑ニ俣鹊热紵F(xiàn)象以及排放性能，其中包括滯燃期子模型、噴霧卷吸子模型、燃燒和火焰?zhèn)鞑プ幽Ｐ?。利用該模型，?duì)一臺(tái)生物制氣—柴油雙燃料發(fā)動(dòng)機(jī)燃燒過程進(jìn)行了模擬計(jì)算，預(yù)測(cè)雙燃料發(fā)動(dòng)機(jī)的Nox排放特性。預(yù)測(cè)計(jì)算結(jié)果與實(shí)測(cè)值的相對(duì)誤差小于5%。供油提前角提前，生物制氣—柴油雙燃料發(fā)動(dòng)機(jī)Nox排放量增加；相同工況下引燃柴油量減小時(shí)，Nox排放量減小。

    Abstract:

    A quasidimensional combustion model for a dualfuel engine was developed based on a doublezone fuel spray entrainment model, which uses fractal theory to describe the geometry of flamelets in turbulent combustion and its propagation as well as its emission performance. The doublezone fuel spray entrainment model is consisted of ignition delay model, fuel spray and air entrainment model, and flame propagation model. Subsequently, the simulation for combustion processes in a biogas diesel dualfuel engine was conducted on to forecast its Nox emission characteristics. The relative error between the simulated results and experimental data is no more than 5%. The Nox emission of the biogas diesel dualfuel engine increases with the increase of pilot fuel quantity and the advancement of fuel delivery advance angle.  

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湯東,銀銘強(qiáng),來超峰,羅福強(qiáng).基于分形理論的雙燃料發(fā)動(dòng)機(jī)Nox排放模擬計(jì)算[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2008,39(9):1-5.[J]. Transactions of the Chinese Society for Agricultural Machinery,2008,39(9):1-5.

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