**4. Conclusions**

In this paper, the effect of different PCC chamber parameters on the performance and emissions of a marine LP-DF engine was investigated using the 3D CFD simulation: PCC nozzle diameter and PCC nozzle angle. The main conclusions are listed as follows:


**Author Contributions:** H.G. and S.Z. contributed to the case study and the original manuscript. M.S. translated the original manuscript. Y.F. checked the results of the whole manuscript.

**Funding:** This research was supported by the China financial support of Marine Low-Speed Engine Project-Phase I and the National Key R&D Program of China (grant no. 2016YFC0205202).

**Conflicts of Interest:** The authors declare no conflict of interest.
