6. CONCLUSION

　

With the newly developed Stratified Fuel Injection System, which injects a small amount of light fuel (10%) both before and after the main injection of a low-grade fuel, the whole combustion process can be improved. The effectiveness of such a stratified injection system can be explained well with the help of fuel spray simulation.

　

References

[2] Amsden, A.A. et al.: KIVA-2. : A computer program for chemically reactive flows with sprays. Los Alamos National Laboratory, Manual, 1989.

　

Acknowledgment

The authors would like to thank the Petroleum Energy Center (PEC) Japan for its cooperation. We also thank the students of the Laboratory of Engine & Combustion (ECO) of the Kyushu University.

　

Table 1: Specification of test engine (H-170)

Fig. 1: Heat release rates of BFOs in engine test run (test engine: H-170)

Fig. 2: Photos of combustion in visual engine

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