【摘要】：基于FLUENT軟件,通過合理設(shè)置上、下游水池進(jìn)出口邊界條件滿足管道水頭在虹吸過程中保持不變的要求,在流量未知、虹吸過程中管道上下游水位保持恒定條件下模擬虹吸管道過流能力及流場特性。應(yīng)用標(biāo)準(zhǔn)k-ε模型和VOF方法對安裝高度為1m,不同管道上下游水位條件下虹吸流動過程進(jìn)行數(shù)值模擬。計算出虹吸管過流能力、速度場、壓降隨水頭的變化規(guī)律。將計算結(jié)果與物理試驗結(jié)果相比可知,隨上、下游水位差增大,管道過流能力和壓降值增大,速度場和壓降特性與有壓管流一般規(guī)律相符。流量計算值與實測值最大相對誤差為2.00%,最小相對誤差為0.72%,壓降計算值與實測值最大相對誤差為4.86%,最小相對誤差為0.36%。表明所選的數(shù)學(xué)模型、邊界條件的設(shè)置方法合理可行,該方法可用來模擬流量未知、管道上下游水位已知時非駝峰式虹吸管的流動特征。
[Abstract]:Based on FLUENT software, the inlet and outlet boundary conditions of downstream pool can meet the requirement of keeping the pipe head unchanged in the siphon process, and the flow rate is unknown. In the process of siphon, the flow field and overcurrent capacity of the siphon pipe are simulated under the condition of constant upstream and downstream water level. The standard k- 蔚 model and VOF method are used to simulate the siphon flow process under different upstream and downstream water levels at a height of 1 m. The variation law of siphon overcurrent capacity, velocity field and pressure drop with water head is calculated. Comparing the calculated results with the physical test results, it can be seen that with the increase of the upstream and downstream water level difference, the overcurrent capacity and the pressure drop value of the pipeline increase, and the velocity field and pressure drop characteristics are consistent with the general law of the pressure pipe flow. The maximum relative error between the calculated flow value and the measured value is 2.00, the minimum relative error is 0.722, the maximum relative error between the calculated value and the measured value is 4.86, and the minimum relative error is 0.36. This method can be used to simulate the flow characteristics of the non-hump siphon when the flow rate is unknown and the water level of the upper and lower reaches of the pipeline is known.
【作者單位】： 新疆農(nóng)業(yè)大學(xué)水利與土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51369031)
【分類號】：TV135

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