| 郭建军, 刘一泽, 邬斌扬, 苏万华.高充量密度重型柴油机燃烧室形状优化数值模拟研究[J].内燃机工程,2021,42(2):72-81. |
| Numerical Simulation of Piston Bowl Optimization for Heavy-Duty Diesel Engines with High Charge Density |
| DOI：10.13949/j.cnki.nrjgc.2021.02.010 |
| Key Words:heavy duty diesel engine piston bowl thermal efficiency charge density |
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| Abstract:To address the poor matching between piston bowl and spray due to in-cylinder charge density being increased, a simulation model of a heavy-duty diesel engine with stepped-lip piston bowl was established with CONVERGR, a computational fluid dynamics software, and was calibrated with the experimental data. The effects of the lip diameter, lip depth, and bottom arc radius of piston bowl on the combustion process and heat transfer loss at low and medium speeds with full load and high charge density were studied, and the shape of piston bowl was optimized to further improve the indicated thermal efficiency. Results show that a relatively flat piston bowl with small lip depth and moderate concave arc radius should be applied when the charge density in the cylinder was higher. The optimization brought higher heat release rate in the later stage of combustion and lower heat transfer loss, making the indicated thermal efficiency increase from 49.00% to 49.47%. At the same time, the NOx emissions were basically unchanged while the soot emissions were reduced by 50%. |
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