中文摘要：

针对长距离有压输水系统的特点,从基本的空气动力学方程入手,分析推导了空气阀的数学模型,并采用水锤计算的特征线方法,进行了空气阀水锤防护的实例分析。同时,探讨了进排气系数对空气阀运行特性和水锤防护效果的影响。计算结果表明,计算模型可以准确地模拟空气阀在水力过渡过程中的进排气特性,空气阀的进排气系数等设计参数对空气阀的水锤防护效果有显著影响。同时,通过合理的布置空气阀,可以有效地抑制输水系统中液柱分离现象的发生,保证输水系统安全。

英文摘要：

Mathematic model of air valve is deduced for long water supply system based on aerodynamic equations.Function of air valve for water hammer protection is analyzed with method of characteristics through practical engineering example.The influence of air admitting and exhausting coefficient on air valve operational characteristics and water hammer protecting result is discussed.The computing results indicate the mathematic model can simulate characteristics of air admission and exhaust in hydraulic transient ...