Limits and Effects of Similarity Ratio in Scaled Model Experiments of Marine Low-Speed Diesel Engines

周昕毅; 李铁

doi:10.13949/j.cnki.nrjgc.2021.02.002

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Limits and Effects of Similarity Ratio in Scaled Model Experiments of Marine Low-Speed Diesel Engines

更新时间：2026-04-16

- Limits and Effects of Similarity Ratio in Scaled Model Experiments of Marine Low-Speed Diesel Engines
- Vol. 42, Issue 2, Pages: 9-15(2021)
- 作者机构：
  
  1. 上海交通大学海洋工程国家重点实验室,上海,200240
  2. 上海交通大学动力装置与自动化研究所,上海,200240
- 作者简介：
- 基金信息：
- DOI：10.13949/j.cnki.nrjgc.2021.02.002
  CLC：
- Published：2021
- 稿件说明：
移动端阅览
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.

周昕毅, 李铁. Limits and Effects of Similarity Ratio in Scaled Model Experiments of Marine Low-Speed Diesel Engines[J]. 2021, 42(2): 9-15.
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. DOI： 10.13949/j.cnki.nrjgc.2021.02.002.

周昕毅, 李铁. Limits and Effects of Similarity Ratio in Scaled Model Experiments of Marine Low-Speed Diesel Engines[J]. 2021, 42(2): 9-15. DOI： 10.13949/j.cnki.nrjgc.2021.02.002.

摘要

为探究相似比例模型实验在船用柴油机中的应用，基于一台缸径为340 mm的船用低速柴油机讨论了模型实验中相似比例的有效边界，随后仿真研究了3种相似法则在不同相似比例下对传热损失、缸内温度分布、缸压、放热率、指示热效率和排放的预测结果。结果表明：缸压、指示热效率和正规化NOx 排放随缸径的增加而升高，正规化碳烟排放随缸径的增加而降低；相似比例模型实验的预测精度随缸径差异的增大而减小，指数函数可用来映射主要设计目标与相似比例的关系。

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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