管道式喷灌系统水力计算的ESM方法

ESM method for hydraulic analysis of sprinkler irrigation system

针对管道式喷灌系统的水力计算,剖析了目前采用的有限元法和Hathoot进步法等数解法的优点和局限性,结合进步法、退步法的计算思路,提出一种可以求解干管双向布置管道式喷灌系统的水力计算方法———改进步进法(ESM)。给出了详细的水力计算步骤及计算机流程图,并给出了实例。计算结果表明,ESM方法的水力学关系式准确和干管双向布置喷灌系统的水力学边界条件清晰,可有效解决干管双向布置的管道式喷灌系统的流量水头计算问题。

In order to improve the hydraulic analysis method of a sprinkler irrigation system, the characteristics of the finite element method, the forward step method and the other numerical methods were evaluated in this paper. By introducing the idea of the forward-step method and the back-step method, a new numerical method, ESM（extented stepwise method）, was presented for the hydraulic analysis of a sprinkler irrigation system with bilateral main-pipes arrangement. This method is an extension of the stepwise method. A computer program employing this technique was de- signed so as to provide sprinkler outflows and pressure head distributions of the system. The numerical example demonstrates that the analytical procedure is simple and accurate for the hydraulic analysis of a sprinkler irrigation system with bilateral main-pipes arrangement.