基于PIV实验的巷道调节风窗流场特征研究
发布时间：2018-11-08 18:28
【摘要】：在矿井通风中,调节风窗是调整和优化井下通风系统必不可少的调节设施之一,而因调节风窗的局部阻力影响导致风流在流经调节风窗之后流场分布甚为复杂而紊乱,使得矿井通风中的相关参数测试不准确而导致通风系统优化不合理。传统的接触式定点流速测量技术因测试时对流场产生干扰,导致测不准而不能真实反映井下瞬态流场分布特征。本文利用粒子图像测速仪(PIV)对巷道调节风窗模型流场进行实验测试,结合数值模拟及实验矿井相互验证和比较,可以反映调节风窗巷道全流场瞬态速度以及时均速度分布结构,获得巷道流场纵向截面风流分布特征及调节风窗相关参数的关系式,为生产现场及调节风窗研究工作者提供指导。PIV实验和数值模拟结果表明,巷道风流经过调节风窗之前风流流场基本不变,而经过调节风窗之后风流流场变得异常紊乱,在调节风窗下隅角产生形态不一的回流旋涡区;风流经过调节风窗后的回流区长度与巷道入口风流速度大小无关,与断面比基本呈对数关系;调节风窗的局部阻力系数受雷诺数的影响较小,而断面比对局部阻力系数的影响较大,且二者呈线性递减关系,并得到拟合函数关系式。在理论和实验研究的基础上,利用回流区长度及局部阻力系数关系式对实验矿井中的调节风窗进行验证测试,结果表明,实验矿井测试所得的调节风窗回流区长度值与PIV实验所得关系式计算值基本相符;调节风窗局部阻力的实验测试值与局部阻力系数公式计算所得局部阻力值的相对误差较小,验证了局部阻力系数ξ函数关系式的正确性,可将此关系式应用于井下生产现场调节风窗局部阻力的测定。
[Abstract]:In mine ventilation, adjusting air window is one of the necessary adjustment facilities for adjusting and optimizing underground ventilation system. However, the distribution of air flow field after flow through the adjusting air window is very complicated and disordered because of the influence of local resistance of regulating air window. The measurement of relevant parameters in mine ventilation is not accurate and the optimization of ventilation system is unreasonable. The traditional contact fixed-point velocity measurement technique can not truly reflect the distribution characteristics of transient flow field in the downhole due to the interference of the flow field during the measurement, which leads to the uncertainty of the measurement. In this paper, the particle image velocimeter (PIV) is used to test the flow field of the wind window model of roadway, and the numerical simulation is combined with the experimental mine to verify and compare each other. It can reflect the structure of adjusting the transient velocity of the whole flow field and the structure of the velocity distribution in time, and obtain the relationship between the air flow distribution characteristics of the longitudinal section of the tunnel flow field and the relevant parameters of adjusting the wind window. The results of PIV experiment and numerical simulation show that the airflow field of roadway is basically unchanged before the air window is adjusted, but the airflow field becomes abnormal after adjusting the wind window. At the lower corner of the adjusting window, the reflux vortex region with different forms is produced. The length of the return zone after adjusting the wind window has nothing to do with the velocity of the air flow at the entrance of the roadway, but a logarithmic relationship with the cross section ratio. The influence of Reynolds number on the local drag coefficient of the regulating wind window is small, while the influence of the section ratio on the local resistance coefficient is greater, and the relationship between them is linear decreasing, and the fitting function relationship is obtained. On the basis of theoretical and experimental research, the relationship between the length of the reflux zone and the local resistance coefficient is used to verify and test the regulating air window in the experimental mine. The results show that, The length of the reflux zone of the adjusting air window obtained from the test mine is basically in accordance with the calculated value of the relation formula obtained by the PIV experiment. The relative error between the experimental test value and the local resistance coefficient formula calculated by adjusting the local resistance of the wind window is relatively small, which verifies the correctness of the functional formula of the local resistance coefficient 尉. The relationship can be applied to the determination of local resistance of air window in downhole production.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD724
本文编号：2319309
[Abstract]:In mine ventilation, adjusting air window is one of the necessary adjustment facilities for adjusting and optimizing underground ventilation system. However, the distribution of air flow field after flow through the adjusting air window is very complicated and disordered because of the influence of local resistance of regulating air window. The measurement of relevant parameters in mine ventilation is not accurate and the optimization of ventilation system is unreasonable. The traditional contact fixed-point velocity measurement technique can not truly reflect the distribution characteristics of transient flow field in the downhole due to the interference of the flow field during the measurement, which leads to the uncertainty of the measurement. In this paper, the particle image velocimeter (PIV) is used to test the flow field of the wind window model of roadway, and the numerical simulation is combined with the experimental mine to verify and compare each other. It can reflect the structure of adjusting the transient velocity of the whole flow field and the structure of the velocity distribution in time, and obtain the relationship between the air flow distribution characteristics of the longitudinal section of the tunnel flow field and the relevant parameters of adjusting the wind window. The results of PIV experiment and numerical simulation show that the airflow field of roadway is basically unchanged before the air window is adjusted, but the airflow field becomes abnormal after adjusting the wind window. At the lower corner of the adjusting window, the reflux vortex region with different forms is produced. The length of the return zone after adjusting the wind window has nothing to do with the velocity of the air flow at the entrance of the roadway, but a logarithmic relationship with the cross section ratio. The influence of Reynolds number on the local drag coefficient of the regulating wind window is small, while the influence of the section ratio on the local resistance coefficient is greater, and the relationship between them is linear decreasing, and the fitting function relationship is obtained. On the basis of theoretical and experimental research, the relationship between the length of the reflux zone and the local resistance coefficient is used to verify and test the regulating air window in the experimental mine. The results show that, The length of the reflux zone of the adjusting air window obtained from the test mine is basically in accordance with the calculated value of the relation formula obtained by the PIV experiment. The relative error between the experimental test value and the local resistance coefficient formula calculated by adjusting the local resistance of the wind window is relatively small, which verifies the correctness of the functional formula of the local resistance coefficient 尉. The relationship can be applied to the determination of local resistance of air window in downhole production.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD724
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