Abstract:On the basis of experimental study of cavitation erosion,silt abrasion and their synergetic erosion on hydrofoil,the mechanism of silt abrasion enhanced by cavitation in hydraulic machinery was analyzed combined with the testing and processing of cavitation structure in silt laden water flow.The erosion patterns were obtained by the contrastive analysis of microscopic appearance in different positions of the hydrofoil surface on three testing conditions and the flow factors which cause different erosion patterns were determined.The characteristics and law of behaviors of cavitation structure on hydrofoil were obtained by analysis and processing of cavitation structure images.The different mechanisms of silt abrasion enhanced by cavitation at the two stages of development of cavitation cavity and collapse of cavitation cloud are put forward by the analysis of erosion patterns and cavitation behaviors on hydrofoil.During the cavitation development stage,the silt particles are accelerated by cavitation cavity.During the cavitation cloud collapse stage,the silt particles are accelerated heavily by pressure wave or micro-jet.The synergetic erosion ability is strengthened by the actions on particles during the two stages.The viewpoints were verified by the experimental results of erosion depth of silt abrasion and their synergetic erosion on hydrofoil
[1]Li S C,Carpenter P W. Anti erosion turbine: Cavitation and silt synergetic erosion [ C ] // Proceedings of the 9th International Symposium on Transpoort Phenomena and Dynamics of Rotating Machinery, 2002 : 10 - 14.[2]铁占续 黄建德.含沙水汽蚀对离心泵损伤的试验研究[J].化工设备与管道,2000,37(3):42-44.[3]Li S C. Cavitation enhanc, ement in silt erosion: Obsta- eles and way forward[ C] //Proceedings of the 5th Inter- national Symposium on Cavitation ,2003 : 1 - 6.[4]韩伟 董志勇 俞小伟 等.掺气条件下空化特性的高速摄影分析[J].水动力学研究与进展:A辑,2010,25(3):352-358.[5]张涛 陈次昌 陈丰.空蚀磨损及其联合作用研究进展[J].排灌机械,2006,24(4):47-53.[6]Li S C. Cavitation enhancement of silt erosion: An envi-sagcd micro model [i J ]. Wear, 2006,260 ( 9 ) : 1145 - 1 150.[7]Dungtan P J,l,i S C. Cavitation enhancement of silt Erosion Numerieal sludies [ J ]. Wear, 2010,268 ( 7/8 ) : 946 - 954.[8]Borkcnl B M ,Arora M, Ohl C D,et al. The acceleration.f solid partieles subjected to cavitation nucleation [J]. Journal Fluid Mechanics, 2008,610 : 157 - 182.[9]张涛 陈次昌 夺丹.低固相含量液流中磨蚀翼型空化特性研究[J].西南石油大学学报自然科学版,2009,31(6):152-155.[10]张勤昭 曹树良 陆力.高比转速混流泵导叶设计计算[J].农业机械学报,2008,39(2):73-76.[11]张涛 陈次吕 郭清.含沙水流中翼制空蚀磨损试验[J].农业机械学报,2010,41(11):31-37.[12]Dular M,Stoffel B, Sirok B. Development of a cavitation erosion model [ J ]. Wear, 2006,261 ( 5/6 ) : 642 - 655.