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气动量仪测头流场对发动机连杆测量稳定性的影响分析

魏先杰 龙威 邓伟 王继尧 吴蜜蜜

魏先杰, 龙威, 邓伟, 王继尧, 吴蜜蜜. 气动量仪测头流场对发动机连杆测量稳定性的影响分析[J]. 机械科学与技术, 2021, 40(3): 428-434. doi: 10.13433/j.cnki.1003-8728.20200064
引用本文: 魏先杰, 龙威, 邓伟, 王继尧, 吴蜜蜜. 气动量仪测头流场对发动机连杆测量稳定性的影响分析[J]. 机械科学与技术, 2021, 40(3): 428-434. doi: 10.13433/j.cnki.1003-8728.20200064
WEI Xianjie, LONG Wei, DENG Wei, WANG Jiyao, WU Mimi. Analyzing Influence of Flow Field of Pneumatic Measuring Instrument on Measurement Stability of Engine Connecting Rod[J]. Mechanical Science and Technology for Aerospace Engineering, 2021, 40(3): 428-434. doi: 10.13433/j.cnki.1003-8728.20200064
Citation: WEI Xianjie, LONG Wei, DENG Wei, WANG Jiyao, WU Mimi. Analyzing Influence of Flow Field of Pneumatic Measuring Instrument on Measurement Stability of Engine Connecting Rod[J]. Mechanical Science and Technology for Aerospace Engineering, 2021, 40(3): 428-434. doi: 10.13433/j.cnki.1003-8728.20200064

气动量仪测头流场对发动机连杆测量稳定性的影响分析

doi: 10.13433/j.cnki.1003-8728.20200064
基金项目: 

国家自然科学基金重点项目 51766006

云南省教育厅科学研究基金项目 2021Y113

学生课外学术科技创新基金项目 2020YB048

清华大学摩檫学国家重点实验室开放基金项目 SKLTKF16B02

详细信息
    作者简介:

    魏先杰(1992-), 硕士研究生, 研究方向为流体传动与控制, 815915603@qq.com

    通讯作者:

    龙威, 教授, 硕士生导师, daifor@163.com

  • 中图分类号: O353.1

Analyzing Influence of Flow Field of Pneumatic Measuring Instrument on Measurement Stability of Engine Connecting Rod

  • 摘要: 现有气动量仪在使用过程中出现测量数值不稳定、工件测量磨损等现象。本文分析了气动量仪测量工作原理,对发动机连杆大头孔与大头测头之间的内部流场进行了数值计算和实验测量,发现现有连杆测头的导向面没有形成有效支撑气膜,且在排气槽中气流紊乱,导致测量过程稳定性差,喷嘴端面附近的排气槽边缘会产生局部高压区,导致气阻增大,从而影响测量精度,从而明确了气动量仪测量过程中气膜流场均匀性对测量稳定性的决定性作用。提出了测量稳定性和可靠性更好地双E型排气槽结构测头,通过分析双E型测头内部流动特征,采用双E型排气槽结构测头的压力和流场分布更均匀,气流波动收敛至稳定值,测量波动幅值是现有测头的1/5,有效提高了的测量精度和测量稳定性。
  • 图  1  排气槽内流场示意图

    1.辅助槽   2.喷嘴端面 3.喷嘴  4.排气槽  5.通槽

    图  2  网格数对数值分析结果影响

    图  3  不同气膜厚度下的测量头承载力和气膜刚度

    图  4  不同排气槽宽度的气阻系数曲线图

    图  5  排气槽深度对气阻系数的影响

    图  6  浮标式气动量仪测试平台

    图  7  气动量仪测量头的结构与压力云图

    图  8  测头的压力曲线图

    图  9  检测气膜排气槽内流场特征

    图  10  连杆孔径分布图

    图  11  连杆孔径圆度分布图

    表  1  气动量仪测头结构参数表

    参数 数值
    喷嘴端面直径D1/mm 4.0
    喷嘴下沉量/μm 0~20
    排气槽宽度L1/mm 0.4~10
    竖直排气通槽L2/mm 1.2~10
    排气槽深度h/mm 0.3 ~0.75
    喷嘴直径d/mm 1.5
    下载: 导出CSV

    表  2  气动量仪测头结构优化参数选取表

    优化参数 尺寸
    喷嘴端面直径D1/mm 4.0
    喷嘴下沉量/μm 10
    排气槽宽度L1/mm 6.0
    竖直排气通槽L2/mm 6.0
    排气槽深度h/mm 0.5
    喷嘴直径d/mm 1.5
    下载: 导出CSV
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  • 收稿日期:  2019-10-30
  • 刊出日期:  2021-03-01

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