圓中環(huán)沉沙排沙過濾池水工模型試驗與結(jié)構(gòu)優(yōu)化試驗研究
本文選題:圓中環(huán)沉沙排沙過濾池 + 水工模型 ; 參考:《新疆農(nóng)業(yè)大學(xué)》2014年碩士論文
【摘要】:圓中環(huán)沉沙排沙過濾池是一種新型的低耗水率、處理泥沙范圍廣的水沙分離裝置。為了探求沉沙池分離水沙機(jī)理,進(jìn)一步優(yōu)化其結(jié)構(gòu)型式,為其推廣應(yīng)用提供理論依據(jù),,本文利用水工模型試驗研究和數(shù)值模擬相結(jié)合的方法研究了沉沙池內(nèi)部流場和沉沙池內(nèi)泥沙淤積形態(tài)、沉沙池沖沙特性等問題。 主要得到了以下幾個結(jié)論: (1)圓中環(huán)沉沙排沙過濾池在出水流量為1m3/s,含沙濃度為0.45kg/m3的條件下連續(xù)運(yùn)行422.5小時,池內(nèi)泥沙淤積量為180m3,占沉沙池有效容積的37.6%;沖沙耗水率為1.9%。 (2)通過對三種不同工況下(中心出水環(huán)堰加高30cm、50cm、80cm)裝置運(yùn)行情況的對比分析說明,不同中心出水環(huán)堰的加高對沉沙池有著不同的影響。中心出水環(huán)堰加高50cm的試驗結(jié)果較為有利,改變原有沉沙池內(nèi)流速分布,保持沉沙池內(nèi)左右90°兩側(cè)流速分布相近的前提下,縮小了0°與180°方向的流速差值,較好的平均了池內(nèi)流速分布。渾水試驗時,池內(nèi)泥沙淤積均勻。 (3)通過對圓中環(huán)沉沙排沙過濾池清水流場的三維數(shù)值模擬,發(fā)現(xiàn)在池內(nèi)左側(cè)45°及右側(cè)45°方向存在漩渦,不利于裝置沉沙排沙。
[Abstract]:Circular sediment filter tank is a new type of water and sediment separation device with low water consumption rate and a wide range of sediment treatment. In order to find out the mechanism of sediment separation, to optimize its structure, and to provide theoretical basis for its popularization and application, In this paper, the hydraulic model test and numerical simulation are used to study the internal flow field of the sediment tank, the sediment deposition form in the sediment tank, and the sand basin scouring Saudi Arabia, etc. The main conclusions are as follows: 1) under the condition of water discharge rate of 1 m3 / s and sediment concentration of 0.45kg/m3, the silt accumulation in the circular ring sediment filter tank is 180 m3, which accounts for 37.6% of the effective volume of sediment sink, and the water consumption rate of the sediment is 1.9% under the condition of water discharge rate of 1 m3 / s and sediment concentration of 0.45kg/m3. 2) by comparing and analyzing the operation of three different working conditions (30 cm / 50 cm ~ (80 cm), it is shown that the heightening of different center outlet ring Weir has different influence on the sediment sink. The experimental results of increasing 50cm in the central outlet cofferdam are more favorable, the velocity distribution in the original sediment tank is changed, and the velocity distribution of the left and right sides of the sediment tank is kept close, and the velocity difference between 0 擄and 180 擄is reduced, and the velocity difference between 0 擄and 180 擄is reduced. The average velocity distribution in the tank is better. In the muddy water test, the silt deposition in the pond is uniform. 3) through the three-dimensional numerical simulation of the clear water flow field in the circular sink-sediment filter tank, it is found that there are swirls in the left and right 45 擄direction of the tank, which is unfavorable to the installation.
【學(xué)位授予單位】:新疆農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TV149
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