制动工况下液力偶合器涡轮轴向漩涡流场试验分析

轴向漩涡流动是研究液力偶合器能量损耗的重要基础。该文基于粒子图像测速技术采集制动工况下液力偶合器轴向漩涡流场图像,通过图像处理技术识别并提取液力偶合器外壁面上特殊几何结构所呈现的光学特征,完成流动图像动态标定。利用霍夫变化直线检测算法识别泵轮轴向流场流速方向,通过图像互相关算法并采用查询窗口偏移技术提取涡轮轴向漩涡流场结构,应用误矢量识别算法检测错误流速矢量并予以剔除,获得优化的流动图谱。研究结果表明：泵轮轴向流场中液流是一种复合加速运动;涡轮轴向流场中液流是一种多尺度漩涡流动,主流区域上流速值为0.2-0.4 m/s,叶片与壁面组成的角隅区域上形成小尺度涡旋,角隅区域上流速值为0.6-1.1...

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Bibliographic Details
Published in农业工程学报 Vol. 33; no. 8; pp. 69 - 75
Main Author 柴博森 项玥 马文星 赵恩鹏 寇尊权
Format Journal Article
LanguageChinese
Published 吉林大学机械科学与工程学院,长春,130022%吉林省产品质量监督检验院,长春,130103 2017
Subjects
偶合器
动态标定
图像处理
查询窗口偏移
涡流
粒子图像测速
轴向漩涡
边缘检测
image processing
动态标定
dynamic calibration
轴向漩涡
particle image velocimetry
涡流
偶合器
coupling
interrogation window offset
vortex flow
边缘检测
查询窗口偏移
axial vortex
图像处理
粒子图像测速
edge detection
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2017.08.009

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Summary:轴向漩涡流动是研究液力偶合器能量损耗的重要基础。该文基于粒子图像测速技术采集制动工况下液力偶合器轴向漩涡流场图像,通过图像处理技术识别并提取液力偶合器外壁面上特殊几何结构所呈现的光学特征,完成流动图像动态标定。利用霍夫变化直线检测算法识别泵轮轴向流场流速方向,通过图像互相关算法并采用查询窗口偏移技术提取涡轮轴向漩涡流场结构,应用误矢量识别算法检测错误流速矢量并予以剔除,获得优化的流动图谱。研究结果表明：泵轮轴向流场中液流是一种复合加速运动;涡轮轴向流场中液流是一种多尺度漩涡流动,主流区域上流速值为0.2-0.4 m/s,叶片与壁面组成的角隅区域上形成小尺度涡旋,角隅区域上流速值为0.6-1.1 m/s。上侧叶片与泵轮、涡轮交界面处的角隅区域上存在与主流循环流动方向相同的小尺度涡旋,涡量数值为？8 s？1,此处涡旋将促进液力能量的传递与转换,其他3个角隅区域上的涡旋方向与此相反,涡量数值分别为13、15和20 s？1,由于该局部区域小尺度涡与主循环涡的相互混合作用,引起流动迟缓,造成能量损耗。试验研究结果将为液力偶合器轴向漩涡流动现象提供有价值的参考依据。
Bibliography:11-2047/S
Axial vortex is a kind of special relative flow within the adjacent blades of hydrodynamic coupler.The distribution of flow field structure and its evolution law are considered as the important foundation for the research on the internal energy losses of hydrodynamic coupler.Transparent square cavity hydrodynamic coupler model prototype made by plexiglass was taken as the experimental measurement object.Axial vortex flow images of hydrodynamic coupler under braking condition were collected based on particle image velocimetry.In order to improve the quality of flow images,image preprocessing was used to identify the flow characteristics of particles in flow images.In order to get a better image calibration result,a special geometric structure of hydrodynamic coupler was taken as an external calibration object.The calibration images were acquired with high-definition CCD（charge coupled device）camera,and then optical characteristics of the special geometry structure were identified and extracted by imag
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.08.009