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首页> 外文会议>ASME Internal Combustion Engine Division technical conference >CFD SIMULATIONS OF THE EFFECT OF WATER INJECTION CHARACTERISTICS ON TSCI: ANEW, LOAD-FLEXIBLE, ADVANCED COMBUSTION CONCEPT
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CFD SIMULATIONS OF THE EFFECT OF WATER INJECTION CHARACTERISTICS ON TSCI: ANEW, LOAD-FLEXIBLE, ADVANCED COMBUSTION CONCEPT

机译：注水特性对TSCI影响的CFD模拟：新的，负载灵活，先进的燃烧概念

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Homogeneous Charge Compression Ignition (HCCI) combustion has the potential for high efficiency with very low levels of NOx and soot emissions. However, HCCI has thus far only been achievable in a laboratory setting due to the following challenges: 1) there is a lack of control over the start and rate of combustion, and 2) there is a very limited and narrow operating range. In the present work, the injection of water directly into the combustion chamber was investigated to solve the aforementioned limitations of HCCI. This new advanced combustion mode is called Thermally Stratified Compression Ignition (TSCI). A 3-D CFD model was developed using CONVERGE CFD coupled with detailed chemical kinetics to gain a better understanding of the underlying phenomena of the water injection event in a homogeneous, low temperature combustion strategy. The CFD model was first validated against previously collected experimental data. The model was then used to simulate TSCI combustion and the results indicate that injecting water into the combustion chamber decreases the overall unburned gas temperature and increases the level of thermal stratification prior to ignition. The increased thermal stratification results in a decreased rate of combustion, thereby providing control over its rate. The results show that the peak pressure and gross heat release rate decrease by 37.8% and 83.2%, respectively, when 6.7 mg of water were injected per cycle at a pressure of 160 bar. Finally, different spray patterns were simulated to observe their effect on the level of thermal stratification prior to ignition. The results show that symmetric patterns with more nozzle holes were generally more effective at increasing thermal stratification.
机译：均质充量压缩点火（HCCI）燃烧具有实现高效率的潜力，且NOx和烟尘排放量非常低。然而，由于以下挑战，到目前为止，HCCI只能在实验室环境中实现：1）缺乏对燃烧的开始和速率的控制，并且2）操作范围非常狭窄。在当前工作中，研究了将水直接注入燃烧室以解决HCCI的上述局限性。这种新的先进燃烧模式称为热分层压缩点火（TSCI）。使用CONVERGE CFD和详细的化学动力学方法开发了3-D CFD模型，以更好地理解均匀低温燃烧策略中注水事件的潜在现象。首先针对先前收集的实验数据验证了CFD模型。然后将该模型用于模拟TSCI燃烧，结果表明，向燃烧室注水会降低总的未燃烧气体温度，并增加点火前的热分层水平。热分层的增加导致燃烧速率的降低，从而提供对其燃烧速率的控制。结果表明，在160 bar的压力下每个循环注入6.7 mg的水时，峰值压力和总热释放率分别降低37.8％和83.2％。最后，模拟了不同的喷雾模式，以观察它们对着火前热分层水平的影响。结果表明，带有更多喷嘴孔的对称图案通常在提高热分层方面更有效。

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