| 周昕毅，李铁.船用低速机模型实验中相似比例的有效边界及影响[J].内燃机工程,2021,42(2):9-15. |
| Limits and Effects of Similarity Ratio in Scaled Model Experiments of Marine Low-Speed Diesel Engines |
| DOI：10.13949/j.cnki.nrjgc.2021.02.002 |
| Key Words:diesel engine scaled model experiment similarity limit heat transfer loss combustion emission |
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| Abstract:In order to study the application of scaled model experiments in marine diesel engines, the limit of similarity ratio was clarified based on a marine low-speed diesel engine with 340 mm bore diameter. Then, the similarity of heat transfer loss, in-cylinder temperature distribution, in-cylinder pressure, heat release rate, indicated thermal efficiency and emissions was studied under different similarity ratios with three scaling laws. The results show that the in-cylinder pressure, indicated thermal efficiency and normalized NOx emissions increase with the increase of bore diameter, while the normalized soot emissions decrease with the increase of bore diameter. The prediction accuracy of the scaled model experiments decreases with the increase of the bore diameter difference, and the exponential function can be used to reflect the relationship between the design parameters and similarity ratios. |
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