Simplified Computation Equation for the Pressure of the Fluctuating Water Flow in PVC Pipes

脈動水流在PVC管道中振幅壓力簡化計算公式

10.6937/TWC.202203_70(1).0005

張凱(KAI ZHANG)；朱德蘭(DELAN ZHU)

Simplified computation equation ； Pressure ； Fluctuating water flow ； PVC pipe ； 簡化計算公式 ； 壓力 ； 脈動水流 ； PVC管道

台灣水利

70卷1期（2022 / 03 / 01）

56 - 65

英文

The application of fluctuating water flow decreases the investment and energy required for irrigation engineering. It also effectively alleviates the clogging of the emitter in drip irrigation engineering and improves the uniformity of water distribution by sprinklers in sprinkling irrigation engineering. This study analyzed the features of pressure of fluctuating water flow over time. On the basis of certain features, by solving both the continuous equation and the motion equation of transient flow, a computation model of amplitude of fluctuating water flow pressure in PVC pipe was established. To reduce the complexity of its solution process, the model was further analyzed, and the relevant influencing factors involved during the computation process of the model were used for experiments. The model was simplified by dimensional analysis of the influencing factors, and a simplified computation equation amplitude of pressure was obtained by regression analysis of experimental data. The verification experiment showed that the average relative error between the measured and the computed value of the pressure amplitude was 5.76%. The experimental results showed that the simplified computation equation achieved high accuracy, which is of great significance for both the application and operation of fluctuating water flow in irrigation engineering.

將脈動水流應用於灌溉工程減少了灌溉工程所需的投資和能耗。有效緩解了滴灌工程中灌水器的堵塞，改善了噴灌工程中噴頭的水量分佈的均勻性。本文分析了脈動水流壓強隨時間的變化特徵。在此基礎上，通過求解瞬變流的連續方程和運動方程，建立了脈動水流在PVC管道中壓強振幅的計算模型。針對模型求解過程複雜的問題，進一步對模型進行分析，並利用模型計算過程中的相關影響因素進行試驗。通過影響因素的量綱分析和試驗資料的回歸分析對模型進行簡化，得到壓強振幅的簡化計算公式。驗證試驗結果表明，壓強振幅的測試值與計算值的平均相對誤差為5.76％。壓強振幅簡化計算公式具有較高的精度，對脈動水流在灌溉工程中的應用和運行具有重要意義。

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