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重型直噴柴油機縮口燃燒室結(jié)構(gòu)特點與評價
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    摘要:

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

    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.重型直噴柴油機縮口燃燒室結(jié)構(gòu)特點與評價[J].農(nóng)業(yè)機械學(xué)報,2007,38(3):56-60.[J]. Transactions of the Chinese Society for Agricultural Machinery,2007,38(3):56-60.

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