【摘要】：隨著城市建設(shè)的快速發(fā)展,大空間、大容量、大跨度的建筑數(shù)量持續(xù)增加,傳統(tǒng)的重力排水由于排水量較小、排水管道較多、懸吊管需要設(shè)置坡度等原因,已不能完全滿(mǎn)足現(xiàn)代大型建筑屋面排水的需求,許多工程開(kāi)始采用排水性能更加優(yōu)良的虹吸雨水排水系統(tǒng),但現(xiàn)有虹吸排水系統(tǒng)的設(shè)計(jì)校核方法是基于滿(mǎn)管流狀態(tài)進(jìn)行的,對(duì)于虹吸的啟動(dòng)和形成過(guò)程了解還不夠深入。而且現(xiàn)有系統(tǒng)中懸吊管長(zhǎng)度均是依據(jù)屋面結(jié)構(gòu)進(jìn)行設(shè)計(jì),沒(méi)有考慮到對(duì)虹吸排水性能的影響,規(guī)范中也沒(méi)有針對(duì)懸吊管長(zhǎng)度的相關(guān)限制。本文主要針對(duì)虹吸形成過(guò)程的系統(tǒng)參數(shù)動(dòng)態(tài)變化規(guī)律以及管道系統(tǒng)中懸吊管長(zhǎng)度的校核方法進(jìn)行研究。論文首先對(duì)虹吸排水系統(tǒng)進(jìn)行理論分析,總結(jié)虹吸排水系統(tǒng)的形成條件和判斷標(biāo)準(zhǔn),提出虹吸排水的性能指標(biāo);搭建單斗虹吸排水系統(tǒng)實(shí)驗(yàn)臺(tái),采用間接測(cè)量法研究不同補(bǔ)水量條件下系統(tǒng)參數(shù)的動(dòng)態(tài)變化規(guī)律,根據(jù)補(bǔ)水量(大流量工況:Q80%,中流量工況:55%Q80%,小流量工況:30%Q55%)把流態(tài)及管道參數(shù)變化分為三個(gè)類(lèi)型,并應(yīng)用文獻(xiàn)測(cè)試數(shù)據(jù)進(jìn)行驗(yàn)證。其次,采用STAR-CCM+軟件,VOF方法建立虹吸排水系統(tǒng)數(shù)值計(jì)算模型,對(duì)大流量工況下的虹吸形成過(guò)程進(jìn)行模擬,通過(guò)對(duì)管內(nèi)流態(tài)變化過(guò)程、系統(tǒng)參數(shù)曲線(xiàn)變化趨勢(shì)、虹吸啟動(dòng)時(shí)間、最大排水量與實(shí)驗(yàn)結(jié)果的對(duì)比,證明了數(shù)值計(jì)算方法的準(zhǔn)確性和可行性;同時(shí),選取管道結(jié)構(gòu)參數(shù)對(duì)虹吸啟動(dòng)時(shí)間進(jìn)行了影響因素敏感性分析,結(jié)果表明:懸吊管長(zhǎng)度、立管直徑、懸吊管管徑、尾管長(zhǎng)度4個(gè)因素對(duì)虹吸啟動(dòng)時(shí)間影響較大,提出了應(yīng)用上游管道體積來(lái)簡(jiǎn)化計(jì)算虹吸啟動(dòng)時(shí)間的思路。最后,針對(duì)現(xiàn)有虹吸排水系統(tǒng)懸吊管較長(zhǎng)的問(wèn)題,提出了懸吊管長(zhǎng)度校核方法。該方法基于伯努利方程、連續(xù)性方程等理論計(jì)算方法以及數(shù)值計(jì)算結(jié)果修正得到懸吊管長(zhǎng)度與最大排水量(Q-L2)、懸吊管長(zhǎng)度與虹吸啟動(dòng)時(shí)間(T1-L2)的簡(jiǎn)化計(jì)算模型,把這兩個(gè)結(jié)論作為懸吊管長(zhǎng)度的限制條件,再根據(jù)當(dāng)?shù)氐臍庀髼l件、屋面結(jié)構(gòu)、天溝尺寸等參數(shù)進(jìn)一步綜合得到懸吊管的最大長(zhǎng)度L2,為工程設(shè)計(jì)提供參考。
[Abstract]:With the rapid development of urban construction, the number of large space, large capacity and large span buildings continues to increase. Many projects have started to adopt siphon Rain Water drainage system with better drainage performance, but the design and checking method of existing siphon drainage system is based on the condition of full pipe flow. The process of siphon initiation and formation is not well understood. The length of suspension pipe in the existing system is designed according to the roof structure without considering the influence on the siphon drainage performance and there is no restriction on the length of the suspension pipe in the code. In this paper, the dynamic variation of system parameters in siphon forming process and the method of checking the length of suspended pipe in pipeline system are studied. Firstly, the paper analyzes the siphon drainage system theoretically, summarizes the forming conditions and judgment criteria of the siphon drainage system, puts forward the performance index of siphon drainage system, builds a single bucket siphon drainage system experimental platform, The dynamic variation of system parameters under different recharge conditions is studied by indirect measurement method. According to the quantity of water supply (large flow condition: Q 80, middle flow condition: 55 Q 80, small flow condition: 30 Q 55%), the variation of flow state and pipeline parameters is divided into three types. And use the literature test data to verify. Secondly, a numerical model of siphon drainage system is established by using STAR-CCM software. The siphon forming process is simulated under the condition of large flow rate. The variation process of flow state in pipe, the change trend of system parameter curve, and the siphon start-up time are analyzed. The comparison between the maximum displacement and the experimental results proves the accuracy and feasibility of the numerical method, and the sensitivity analysis of the influence factors on the siphon start-up time by selecting the structural parameters of the pipe shows that: the length of the suspended pipe, Four factors, such as riser diameter, suspended pipe diameter and tail tube length, have great influence on the siphon start-up time. This paper puts forward a way to simplify the calculation of siphon start-up time by using upstream pipe volume. Finally, aiming at the problem of long suspension pipe in existing siphon drainage system, a method for checking the length of suspension pipe is put forward. Based on Bernoulli equation, continuity equation and numerical results, the simplified calculation models of suspension pipe length and maximum displacement (Q-L2), suspension pipe length and siphon start-up time (T1-L2) are obtained. These two conclusions are taken as the limiting conditions of the length of the suspended pipe, and the maximum length of the suspended pipe L _ 2 is further synthesized according to the local meteorological conditions, roof structure and gutter size, which provides a reference for the engineering design.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU823

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本文編號(hào)：2146468