CAJ | 학술논문

空气阀是安装在输水管道上的水锤防护装置。空气阀型式和孔径选择不合适，会使空气进入管道不及时而引起汽化现象或管道内的空气快速排放而引起水柱分离再弥合的撞击。为了研究不同型式空气阀的水锤防护效果，运用瞬变流理论和特征线方法，建立空气阀边界条件；用Matlab软件进行数值模拟计算，比较了没有空气阀、单阀孔空气阀和双阀孔空气阀的水锤防护效果。进一步分析了使用双阀孔空气阀时，不同阀孔孔径对水锤防护效果的影响。计算结果表明：安装孔径合适的双阀孔空气阀可以同时达到减小瞬变负压和防止瞬变正压过高的目的。
공기벌시안장재수수관도상적수추방호장치。공기벌형식화공경선택불합괄，회사공기진입관도불급시이인기기화현상혹관도내적공기쾌속배방이인기수주분리재미합적당격。위료연구불동형식공기벌적수추방호효과，운용순변류이론화특정선방법，건립공기벌변계조건；용Matlab연건진행수치모의계산，비교료몰유공기벌、단벌공공기벌화쌍벌공공기벌적수추방호효과。진일보분석료사용쌍벌공공기벌시，불동벌공공경대수추방호효과적영향。계산결과표명：안장공경합괄적쌍벌공공기벌가이동시체도감소순변부압화방지순변정압과고적목적。
Air valve is water hammer protection device installed at water transfer pipes or mains. Improper selection of air valve type and size could lead to the phenomenon of vaporization as the inflow of air entering into the pipes not in time,or the fast expulsion of air in the pipeline indu-cing the separation of water column and close the transient.In order to study the effect of water hammer protection by different types of air valve,the theory of transient and the method of char-acteristics are used to establish the boundary conditions of air vale in this paper.Matlab software is used to carry out numerical simulation calculation and to compare the effects of water hammar potection without airvalve and with single valve oriffice and double-criffice air valves.The effects of water hammar protection by different valves with different diameters are further analyzed when the air valves with double valve oriffice are used.The calculated results indicate installing the ap-propriate oriffice diameter air valve with double-valve oriffice can achieve reducing transient nega-tive pressure and prevent the excessive transiment positive pressure at the same time.