重力有压流长距离输水可靠性模拟

Simulation for Reliability of Pressured Gravity Water Transportation in Long Distance

摘要:

以重力有压流长距离输水系统为研究对象，采用水厂需水量满足程度作为系统可靠性的量化指标，建立输水系统可靠性模型，模拟分析了连通管间距对输水系统可靠性的影响.算例结果表明，随着连通管数目的增加，系统可靠度趋于稳定；同一连通管间距下，输水距离越大，系统可靠度越低；随连通管间距的减小，输水距离导致的可靠度差距逐渐减小.在保证输水系统可靠度要求的前提下，定量测算了不同输水距离下连通管间距的参考值，为科学设计长距离重力有压流输水系统，提高系统可靠性提供依据和参考.

Abstract:

By studying the pressured gravity water transportation in long distance, a reliability model was proposed with the fulfillment of water demand (the ratio between water delivered and water demand) as the reliability (Re) quantitative index. A case study was made of the model in simulating the system reliability variety in different connection pipe distance(CPD) during failure states due to the unavailability of a pipe by taking into account the probability of the failure events. The result shows as the number of the connection pipes goes on, the system reliability begins to stabilize; with the same connection pipe distance, a longer transportation distance results in a lower system reliability and the reliability difference caused by transportation distance reduces with the decreasing of the connection pipe distance. Based on the above, the connection pipe distance was quantitatively calculated under the required reliability of the long distance pressured gravity water transfer system, then, the reference value of the connection pipe distance was proposed during different transportation distances, which provides the basis for improving the long distance water transportation.