| 冷先银,隆武强,冯立岩,董全,李海鹰,王向军,余勇新,王爱国〖〗.喷射率对柴油机性能和排放影响数值模拟研究[J].,2011,(2):180-187 |
| 喷射率对柴油机性能和排放影响数值模拟研究 |
| Numerical simulation research into effects of injection rates on performances and emissions of diesel engine |
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| DOI：10.7511/dllgxb201102005 |
| 中文关键词: 柴油机 靴型喷油率 性能 排放 |
| 英文关键词: diesel engine boot-type injection rates performance emissions |
| 基金项目:国家部委预先研究资助项目(A1420060212). |
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| 中文摘要: |
| 为了以较低的成本降低中速大功率船用柴油机的NO x 排放,开发了一种可实现靴型燃油喷射规律的调压孔式喷油泵．利用三维CFD软件AVL FIRE v8.5对某大功率中速船用柴油机的缸内流动、混合气形成和燃烧过程进行了模拟计算,分析了调压孔式喷油泵的靴型喷射规律在2种负荷、3种喷油定时下对柴油机性能和排放的影响．结果表明:所用靴型喷射规律可以获得比原机更低的NO x 排放,其中Boot1规律可以获得更好的 φ (NO x )- φ (碳烟)折中关系,而Boot2规律可以获得更好的 φ (NO x )-\%b\% i折中关系；确保靴型喷射规律的后期喷油率较高,有利于降低柴油机的碳烟排放和油耗．在一台6缸柴油机上进行了台架试验,证明了数值模拟预测结果的可信性． |
| 英文摘要: |
| To reduce the NO x emissions from medium speed marine diesel engines with low costs, a pressure-modulating-hole type fuel pump was developed, which could provide boot-type injection rates. 3D CFD package AVL FIRE v8.5 was used to simulate the in-cylinder gas flow, fuel-air mixing and combustion processes of a medium speed, high-power marine diesel engine. And the effects of the boot-type injection rates provided by the new pumps on the performance and emissions at 2 loads with 3 injection timings of the engine were analyzed. The simulation results indicate that, lower NO x emissions are obtained with the boot-type injection rates, among which the injection rate Boot1 can produce better \%φ\%(NO x )-\%φ\%(soot) compromise relationship, while injection rate Boot2 can produce better \%φ\%(NO x )-\%b\% i compromise relationship. Moreover, assuring the higher injection rates at the later stages of the boot-type injection is beneficial to reducing the soot emission and fuel consumption of the diesel engine. Bench tests were performed in a 6-cylinder diesel engine, and the results verify that the numerical simulation prediction is reliable. |
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