CAJ | 학술논문

在长距离有压输水系统中,空气阀防护水锤的效果往往与其进排气流量系数密切相关,而通常在进行空气阀的进排气流量计算时认为进排气流量系数为常量。研究通过分析比较空气阀排气性能规范实测数据与理论计算结果,得出空气阀的排气流量系数是随着阀内外压差的变化而变化的,应是一动态的系数,且工程实例计算结果表明排气流量系数采用固定值和动态值得到的空气阀的进排气特性有明显差别,从而为更准确模拟长距离有压输水系统的水力过渡过程提供技术依据。
재장거리유압수수계통중,공기벌방호수추적효과왕왕여기진배기류량계수밀절상관,이통상재진행공기벌적진배기류량계산시인위진배기류량계수위상량。연구통과분석비교공기벌배기성능규범실측수거여이론계산결과,득출공기벌적배기류량계수시수착벌내외압차적변화이변화적,응시일동태적계수,차공정실례계산결과표명배기류량계수채용고정치화동태치득도적공기벌적진배기특성유명현차별,종이위경준학모의장거리유압수수계통적수력과도과정제공기술의거。
In the long pressure water delivery system,the effect of air valve for water hammer protection is often closely related with its discharge coefficient,and usually the discharge coefficient is regarded as constant when flow for outflow and inflow air valve is calculated.By the analysis and comparison between the measured data of exhaust performance of air valve and the result of theoretical calculation in this study,it concludes that the discharge coefficient for the outflow orifice,changing with the variation of pressure difference inside and outside of the air valve,it should be a dynamic coefficient,And the calculation result of the engineering example also shows intake and exhaust performance of air valve using a fixed discharge coefficient have significant differences with using a dynamic one,consequently provides technical support for more accurate simulation on hydraulic transition process in long distance pressure water delivery system.