CAJ | 학술논문

采用直径75 mm的PVC给水管，建立了山地灌溉管道模型，对有压灌溉管道中凸起管段气囊运动的水力特性进行研究。试验中改变管道中流量，观察管道凸起部位气囊运动情况；通过量测流量、管道动水压强，分析了雷诺数与管道凸起处135°弯头局部阻力系数的关系。结果表明：①随着管道输水流量减小，管道突起部位气囊体积扩大，气囊对管道水流阻力增大；②随着雷诺数增大，管道凸起管段135°弯头局部阻力系数减小，雷诺数小于2．0×104时，局部阻力系数随雷诺数增大而迅速减小，最后趋于稳定。
채용직경75 mm적PVC급수관，건립료산지관개관도모형，대유압관개관도중철기관단기낭운동적수력특성진행연구。시험중개변관도중류량，관찰관도철기부위기낭운동정황；통과량측류량、관도동수압강，분석료뢰낙수여관도철기처135°만두국부조력계수적관계。결과표명：①수착관도수수류량감소，관도돌기부위기낭체적확대，기낭대관도수류조력증대；②수착뢰낙수증대，관도철기관단135°만두국부조력계수감소，뢰낙수소우2．0×104시，국부조력계수수뢰낙수증대이신속감소，최후추우은정。
By using the 75mm PVC water supply pipe,it established the mountainous region irrigation pipe model,and researched the hydraulic characteristics of mountainous irrigation pipe with air movement. In the experiment,it changed the pipe flow and observed the airbag movement of the pipe protruding parts. Through measuring the flow rate and pipe hydrodynamic pressure,it discussed the relationship between the 135 ° elbow local resistance coefficient and Reynolds number. The results show that:a)As the flow rate decreasing,the pipeline airbag volume amplifies and the air bag to pipe flow resistance increases. b)as the Reynolds number increasing,the 135 ° elbow local resistance coefficient decreases. When the Reynolds number is less than 2 × 104 ,the local resistance coefficient decreases rapidly with the increase of the Reynolds number,and finally tends to be stable.