摘要
气体静压节流器的承载力与稳定性之间是一对矛盾,市售节流器的承载力只适用于小载荷的仪器仪表。为提升节流器承载力并保证流场稳定,设计并制作多微通道式气体静压节流器。该节流器结合小孔节流和环面节流方式,具有二次节流效果,采用分体式、过盈配合而成,设计理念与机械结构上均有显著创新。为测试自制多微通道式气体静压节流器的承载力性能,对复合型节流方式产生的承载力进行近似理论计算,并得到不同供气压力下的理论承载力曲线。通过试验,在不同供气压力下测量该节流器承载力,绘制实测承载力并与理论曲线相较,二者较吻合。选取常用的两种节流面积相近的节流器作为试验参照组,与该节流器进行承载力大小的比对,并分析数据与误差源。试验结果表明,多微通道式气体静压节流器能显著提高承载能力,同样供气压力下,承载力明显大于另外两种节流器,具有较好的工程应用前景。
There is a contradiction between beating capacity and stability of the aerostatic restrictors.The bearing capacity of commercial restrictors applies only to small-load instrumentation.In order to improve the bearing capacity and stable the flow field,an aerostatic restrictor with microchannels has been designed and produced.The said restrictor combines the orifice and torus throttling methods,so it has a secondary throttling effect.Also,it has two individual parts for an interference fit.Therefore,it is radically innovative in both the design concept and the mechanical structure.To test the bearing capacity performance of the self-designed aerostatic restrictor with microcharmels,theoretical approximate calculations of bearing capacity due to compound throttling method are carried out,and theoretical bearing capacity curves under different gas pressure are obtained.The bearing capacity of the said restrictor is measured under different gas pressure through experiments,and compared with the theoretical curves,which are in accordance with the former.Two widely used aerostatic rcstrictors with similar throttling area are selected as controls and compared with the said restrictor in bearing capacity.Besides,the data and the error sources are analyzed.The experimental results demonstrate that the aerostatic restrictors with microcharmels could greatly improve the bearing capacity.Under the same gas pressure,the bearing capacity of the said restrictor is significantly higher than the other two restrictors.Therefore,the aerostatic restrictors with microchannels have promising prospect of engineering application.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2012年第20期135-141,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51075378)
关键词
气体静压节流器
气膜厚度
承载力
静态性能
Aerostatic restrictor Air film thickness Air film stiffness Static performance
