PNF管内层流压降数值计算模型及偏差分析  

Analysis of numerical model and deviation of laminar pressure drop in pipe noncontinuous fluid

作　　者：滕一峰[1,2] 郭少华[1] 陈勇民[2] 陶松垒[2] 

机构地区：[1]中南大学土木工程学院,长沙410075 [2]浙江科技学院土木与建筑工程学院,杭州310023

出　　处：《应用力学学报》2016年第4期672-677,741,共6页Chinese Journal of Applied Mechanics

基　　金：浙江省自然科学基金(Y1100148)

摘　　要：为了建立管道非连续流体（PNF）输送时管内层流压降数值模型,基于牛顿流体和宾汉流体管内层流压降模型,考虑实际工程中气体在管道中低速运动的阻力对PNF输送阻力的影响,对PNF压降模型进行简化。结合工程实践详细分析了PNF管内层流压降近似表达式和相对精确表达式,并分析了二者之间的偏差。结合对工程数据的分析,验证了PNF管内层流压降模型的有效性。结果表明：当PNF流量增大或输送管管径减小时,使用压降近似公式与压降相对精确公式计算出的压降值之间的偏差会减小。通过与实测值对比表明,本文模型较好地描述了PNF输送时的压降。其中压降近似模型的精度更优（计算值与实测值的偏差率为1.16%~8.33%）,且求解更方便。In order to establish the pressure drop numerical model of pipe noncontinuous fluid(PNF) under laminar tube flow transportation, based on the pressure drop numerical model of laminar tube flow in Newtonian fluid and Bingham fluid, and considering the influence of gas resistance while low-speed moving in engineering practice to the PNF transportation, the pressure drop numerical model of PNF is simplified. Combining with engineering practice, the approximation solution formula and the relative exact solution formula of PNF's laminar pressure drop is analyzed and then the deviation between the two solutions is discussed. The validity of the PNF's laminar pressure drop model is verified through analysis of engineering data. The results show the fact that the deviation will decrease while the quantity of flow increases, and also decrease while the radius of the conveying pipe decreases. By comparing the measured value with the calculated value, it can be concluded that the models established describe the pressure drop in PNF transportation very well. The approximate model is better in accuracy and easier to be solved, the deviation between approximate solution and measured value ranges from 1.16% to 8.33% and the deviation between relative exact solution and measured value ranges from 1.96% to 13.33%.

关 键 词：PNF(管道非连续流体) 层流 压降 近似解 相对精确解 

分 类 号：V211.17[航空宇航科学与技术—航空宇航推进理论与工程]