| 壁面粗糙度对水平后台阶气粒两相流动影响的PDPA实验研究 |
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| 引用本文： | 张夏,周力行.壁面粗糙度对水平后台阶气粒两相流动影响的PDPA实验研究[J].工程热物理学报,2004(Z1). |
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| 作者姓名： | 张夏 周力行 |
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| 作者单位： | 清华大学工程力学系 清华大学工程力学系 北京 中国科学院力学研究所国家微重力实验室 北京 |
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| 基金项目： | 国家重点基础研究专项经费资助项目子课题(No.G1999-0222-08)，中国科学院知识创新工程重要方向项目(KJCX2-SW-L05) |
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| 摘 要： | 用相位多普勒颗粒测速仪(PDPA)测量了颗粒的平均与脉动速度,研究了壁面粗糙度对水平后台阶气粒两相流动的影响。研究结果表明,壁面粗糙度减小颗粒纵向平均速度,增大颗粒纵向和横向脉动速度。壁面粗糙度对流场中不同位置处颗粒运动影响的强弱不同,其中逆流区处较弱,下游处较强。壁面粗糙度对不同粒径颗粒运动影响的强弱不同,其中对细颗粒的影响较弱且被局限在壁面附近,对粗颗粒的影响较强且扩散到整个流场。
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| 关 键 词： | PDPA测量 气粒两相流动 颗粒-壁面碰撞 壁面粗糙度 |
PDPA MEASUREMENTS OF THE EFFECT OF WALL ROUGHNESS ON GAS-PARTICLE FLOWS IN A HORIZONTAL BACKWARD-FACING STEP |
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| ZHANG Xia ZHOU Li-Xing.PDPA MEASUREMENTS OF THE EFFECT OF WALL ROUGHNESS ON GAS-PARTICLE FLOWS IN A HORIZONTAL BACKWARD-FACING STEP[J].Journal of Engineering Thermophysics,2004(Z1). |
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| Authors: | ZHANG Xia ZHOU Li-Xing |
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| Abstract: | The effect of wall roughness on gas-particle flows in a horizontal backward-facing step is studied using a phase-Doppler particle anemometer (PDPA) by measuring the mean and RMS particle velocities. The results show that the wall roughness reduces the longitudinal mean velocity and increases the longitudinal and transverse fluctuation velocities. The effect of roughness on particle motion in the recirculation zone is weaker than that in the fully developed flow region. The effect of roughness for small particles is weaker and is restricted only in the near-wall region, while the effect of roughness for large particles is stronger and diffuses to the whole flow field. |
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| Keywords: | PDPA measurements gas-particle flows particle-wall collisions wall roughness |
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