自激吸气射流的冲蚀及吸气性能试验研究  

Experimental study on erosion and suction characteristics of self-excited inspiratory jet

作　　者：张明星[1,2] 康勇[1,2] 周勇祥[3] 刘文川[1,2] 王爱华[1,2,4] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072 [2]水射流理论与新技术湖北省重点实验室,湖北武汉430072 [3]中航工业金城南京机电液压工程研究中心,江苏南京211106 [4]武汉大学大学生工程训练与创新实践中心,湖北武汉430072

出　　处：《排灌机械工程学报》2017年第5期375-380,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家863计划项目(2015AA043401)

摘　　要：通过在自激脉冲射流喷嘴振荡腔四周开孔吸入空气,使之形成自激气液射流,以试件冲蚀深度、冲蚀面积和气孔吸气量为衡量标准,研究了不同进气方式、吸气孔直径对自激吸气射流的冲蚀效果和吸气性能的影响.试验结果表明:冲蚀深度和冲蚀面积均随着吸气孔孔径的增大而增大;进气方式、吸气孔直径对冲蚀深度和面积的影响有所不同,冲蚀深度随吸气孔数量的增加而上升,而冲蚀面积受吸气孔的对称性影响较大,非对称进气下的冲蚀面积要明显高于对称进气工况;自激吸气射流具有独特的冲蚀特性,且进气方式对射流形成的冲蚀形貌有较大影响;自激吸气喷嘴的吸气流量具有周期性,且吸气能力随射流工作压力的升高而增强;喷嘴的吸气性能与进气方式、气孔直径有关,单气孔进气时,吸气性能随气孔直径的增大而增强,而多气孔进气时,4 mm孔径的吸气性能最强.A self-excited water -air jet was generated by the sucked air through （our holes through the wall of a resonance chamber in front of a jet nozzle. Experiments were performed on this kind of jet to identify effects of inspiratory modes and diameters of suction holes on the self-excited inspiratory jet by examining erosion depth and damaged area in specimens and inspiratory capacity through the holes. The results show that the erosion depth and damaged area increased with increasing diameter of the suction holes, and the erosion depth increased with the number of holes. Inspiratory modes play an important role in the erosion morphology of specimen and the unique erosion characteristics are observed when air is introduced. Additionally, the damaged area under the asymmetric inlet condition is significantly higher than that under the symmetric inlet condition. The inspiratory flow is periodic, and the inspiratory capacity increased with increasing inlet pressure. The inspiratory modes and the diameter of suction hole affect the inspiratory performance. Particularly, the inspiratory capacity inerease with increasing diameter of the suction holes when only one suction hole is in operation, while the best inspiratory performance is achieved at 4 mm diameter when muhiple suction holes are open.

关 键 词：自激吸气射流 进气方式 气孔直径 吸气性能 冲蚀效果 

分 类 号：S277.9[农业科学—农业水土工程] TV136[农业科学—农业工程]