基金Supported by the Program for New Century Excellent Talents in University(NECT-11-0826) the National Natural Science Foundation of China(NSFC 51279037)+1 种基金 the Fundamental Research Funds for the Central Universities(HEUCFZ13) the Postdoctoral Science-research Developmental Foundation of Heilongjiang Province(LBH-Q12126)Acknowledgement The authors gratefully acknowledge vice Professor Yong Shi and Jun Sun's help in fuel injection experiment.