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重型直噴柴油機(jī)縮口燃燒室結(jié)構(gòu)特點(diǎn)與評(píng)價(jià)
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    摘要:

    定量評(píng)價(jià)缸內(nèi)瞬態(tài)氣流特性,，定義了渦流強(qiáng)度保持性概念,。利用CFD軟件FIRE對柴油機(jī)縮口直噴燃燒室內(nèi)的氣流分布特性進(jìn)行了數(shù)值計(jì)算,，在此基礎(chǔ)上根據(jù)流場隨曲軸轉(zhuǎn)角變化特性的計(jì)算結(jié)果,，用Matlab軟件計(jì)算了瞬態(tài)的渦流強(qiáng)度保持性，由此分析燃燒室結(jié)構(gòu)對渦流強(qiáng)度保持性的影響,。同時(shí)試驗(yàn)研究了渦流強(qiáng)度保持性與噴射系統(tǒng)參數(shù),、進(jìn)氣渦流匹配時(shí)對柴油機(jī)性能的影響,。結(jié)果表明，通過燃燒室結(jié)構(gòu)控制渦流強(qiáng)度保持性,，并與其他參數(shù)優(yōu)化匹配后在動(dòng)力性,、經(jīng)濟(jì)性保持不變的前提下，可有效地改善柴油機(jī)的排放特性,。

    Abstract:

    The swirl intensity retention is defined to evaluate the transient flow characteristics in cylinder. The flow field in reentrant combustion chambers for heavy-duty automotive DI diesel engines is simulated and analyzed by software FIRE provided by AVL Co. The swirl intensity retention is calculated by Matlab from the simulation data. Based on this, the optimized experiments for matching between the fuel injection system and combustion chambers with different reentrant diameter have been done. The results show that by selecting different size of reentrant combustion chamber, the flow field in combustion chamber can be organized effectively and the optimized intake swirl intensity can be found, and through optimization matching with injection system parameters and flow characteristics in combustion chamber, the engine performance and emissions can be improved effectively.

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林學(xué)東,王海軍,萬曉東,于丹.重型直噴柴油機(jī)縮口燃燒室結(jié)構(gòu)特點(diǎn)與評(píng)價(jià)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2007,38(3):56-60.[J]. Transactions of the Chinese Society for Agricultural Machinery,2007,38(3):56-60.

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