通道形状对活塞冷却油腔内工作流体阻力及流动特性的影响
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摘要
为揭示通道形状对活塞冷却油腔内工作流体的阻力及流动特性的影响,将冷却油腔的直壁通道改为波壁通道,并采用压力差和可视化的方法对通道内工作流体的阻力及流动特性展开了实验研究。压力差实验结果表明,与水在直壁通道内的流动相比,水在波壁通道内层湍转捩点大大提前,将非牛顿流体替换水作为工作流体后,层湍转捩点再次提前;可视化实验结果表明,波壁通道内工作流体在雷诺数较低时就可呈现不稳定流动形态。为在较低雷诺数下继续强化活塞冷却油腔内的热质传递,进一步开展了脉动流场下非牛顿流体在波壁通道内的流动特性实验和数值模拟研究,结果表明:脉动流场的操作参数对波壁通道内非牛顿流体的流动不稳定率有较大影响,且影响了通道内非牛顿流体的质量传递。
In order to reveal the effects of channel shape on resistances and flow characteristics of working fluids in piston cooling oil cavities, a straight wall channel was changed into the wave-walled channel, and experimental studies were carried out by pressure difference and visualization methods. The experimental results of pressure difference show that the water in wave-wall channel leads to an earlier transition point of laminar flow to turbulence compared with the flow of water in straight wall channel, and the transition point is brought forward again when non-Newtonian fluid is as the working fluids instead of water. The experimental results of visualization show that the working fluid in the wave-wall channel may observe the unstable flow pattern when the Reynolds number is low. In order to further enhance the process of heat and mass transfer at low Reynolds numbers, the flow characteristics of non-Newtonian fluid in the wave-walled channel were studied under pulsating flow field by experiments and numerical simulation. The results show that the operation parameters of the pulsating flow field have significant influences on instability rate of flow for non-Newtonian in the wave-wall channel, and further impact on the mass transfer.
In order to reveal the effects of channel shape on resistances and flow characteristics of working fluids in piston cooling oil cavities, a straight wall channel was changed into the wave-walled channel, and experimental studies were carried out by pressure difference and visualization methods. The experimental results of pressure difference show that the water in wave-wall channel leads to an earlier transition point of laminar flow to turbulence compared with the flow of water in straight wall channel, and the transition point is brought forward again when non-Newtonian fluid is as the working fluids instead of water. The experimental results of visualization show that the working fluid in the wave-wall channel may observe the unstable flow pattern when the Reynolds number is low. In order to further enhance the process of heat and mass transfer at low Reynolds numbers, the flow characteristics of non-Newtonian fluid in the wave-walled channel were studied under pulsating flow field by experiments and numerical simulation. The results show that the operation parameters of the pulsating flow field have significant influences on instability rate of flow for non-Newtonian in the wave-wall channel, and further impact on the mass transfer.
引文
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[3] 文均,王东方,雷基林,等.活塞内冷油腔的振荡传热特性及位置的研究 [J].中国机械工程,2019,30(6):672-679.WEN Jun,WANG Dongfang,Lei Jilin,et al.Oscillatory Heat Transfer Characteristics and Location of Cold Oil Chamber in Piston [J].China Mechanical Engineering,2019,30(6):672-679.
[4] 陈威,黎源源,林俊.凹槽微通道铜-水纳米流体传热与流动分析 [J].中国机械工程,2014,25(17):2277-2282.CHEN Wei,LI Yuanyuan,LIN Jun.Heat Transfer and Flow Analysis of Copper-water Nanofluids in Grooved Microchannels [J].China Mechanical Engineering,2014,25(17):2277-2282.
[5] 常伟,连文磊,宣益民.旋转热管流动和传热数值模拟[J].工程热物理学报,2015,36(7):1524-1527.CHANG Wei,LIAN Wenlei,XUAN Yimin.Numerical Simulation of Flow and Heat Transfer in a Rotating Heat Pipe [J].Journal of Engineering Thermophysics,2015,36(7):1524-1527.
[6] 王丹,宫本希,王永庆,等.正弦波纹流道中流体流动和传热特性研究 [J].机械设计与制造,2014(10):102-104.WANG Dan,GONG Benxi,WANG Yongqing,et al.Study on Fluid Flow and Heat Transfer Characteristics in Sinusoidal Corrugated Flow Channel [J].Mechanical Design and Manufacturing,2014(10):102-104.
[7] 贾宝菊,孙发明,卞永宁,等.波壁管内的脉动流动及传质强化的数值模拟 [J].化工学报,2009,60(1):6-14.JIA Baoju,SUN Faming,BIAN Yongning,et al.Numerical Simulation of Pulsating Flow and Mass Transfer Enhancement in a Corrugated Tube [J].Journal of Chemical Industry,2009,60(1):6-14.
[8] 贾宝菊,马宗豪,卞永宁.利用电化学方法测量波壁管内的质量传递速率 [J].实验力学,2009,24(1):42-48.JIA Baoju,MA Zonghao,BIAN Yongning.Measurement of Mass Transfer Rate in Wave-wall Tube by Electrochemical Method [J].Experimental Mechanics,2009,24(1):42-48.
[9] 张亮,原亚东,孙志强,等.波壁管几何尺寸对流动与传热特性的影响 [J].热科学与技术,2018,17(4):283-289.ZHANG Liang,YUAN Yadong,SUN Zhiqiang,et al.Influence of Geometric Dimensions of Wave-wall Tube on Flow and Heat Transfer Characteristics [J].Thermal Science and Technology,2018,17(4):283-289.
[10] ZHANG Liang,BIAN Yongning,BAI Minli.Fluid Flow and Mass Transfer Characteristics of Water and Polyacrylamide Solution [J].Experimental Thermal and Fluid Science,2013,46:191-198.
[11] AFZAL A,KIM K Y.Flow and Mixing Analysis of Non-Newtonian Fluids in Straight and Serpentine Micro-channels [J].Chemical Engineering Science,2014,116:263-274.
[12] 张钧波,张敏.幂律非牛顿流体在偏心圆环管中流动和传热的数值计算 [J].江苏科技大学学报,2014,28(5):461-465.ZHANG Junbo,ZHANG Min.Numerical Calculation of Flow and Heat Transfer of Power-law Non-newtonian Fluid in Eccentric Annular Tube [J].Journal of Jiangsu University of Science and Technology,2014,28(5):461-465.
[13] 易妍妍,王智慧,杨超,等.静止非牛顿流体中气泡生成过程的传质 [J].化工学报,2015,66(11):4335-4341.YI Yanyan,WANG Zhihui,YANG Chao,et al.Mass Transfer of Bubble Formation in a Stationary Non-Newtonian Fluid [J].Journal of Chemical Industry,2015,66(11):4335-4341.
[14] 王立军,张宏方,王德民.影响聚合物溶液流变性能的因素分析[J].大庆石油学院学报,2002,26(4):16-18.WANG Lijun,ZHANG Hongfang,WANG Demin.Analysis of the Factors that Affect the Rheological Property of Polymer Solution[J].Journal of Daqing Petroleum Institute,2002,26(4):16-18.