本文關(guān)鍵詞：三維屋面積雪分布的數(shù)值仿真與風洞試驗研究　出處：《西南交通大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 風致雪漂移 數(shù)值模擬 風洞試驗 兩相流 準靜態(tài)方法 屋面 積雪分布

【摘要】：突如其來的風雪災(zāi)害會給人們的生產(chǎn)生活帶來巨大的威脅,屋面上大量的不均勻雪荷載會致使房屋結(jié)構(gòu)坍塌。本文回顧了國內(nèi)外的相關(guān)研究,歸納、總結(jié)了風致雪漂移的基礎(chǔ)理論,從數(shù)值仿真和風洞試驗兩方面入手,著重研究屋面積雪分布特征,提出了一種數(shù)值模擬方法。本文主要完成了如下幾個方面的工作:(1)建立了一種基于FLUENT提供的Mixture兩相流模型和準靜態(tài)方法的數(shù)值模擬方法,并同時考慮了積雪預(yù)鋪和休止角的影響。使用文獻中的二維平屋面模型做二維模擬,對這種數(shù)值仿真方法進行驗證。(2)對三維平屋面進行數(shù)值仿真,分析平屋面屋面粒子深度分布特征和模型高寬比對模型屋面粒子深度分布的影響。(3)對三維雙坡屋面進行數(shù)值仿真,分析雙坡屋面粒子深度分布特征和屋面坡度對屋面粒子深度分布的影響。(4)從幾何、啟動條件、運動以及時間等方面,分析研究風致雪漂移風洞試驗應(yīng)該滿足的相似率。(5)使用石英砂作為雪模型的粒子,對三個不同高寬比的三維平屋面和兩個不同坡度的雙坡屋面進行風洞試驗。試驗中分別測定了不同名義風速下的流場特征和石英砂的休止角,對兩組模型進行了若干組工況下的屋面積雪分布的風洞試驗,分別測定了不同風速、不同時間的屋面粒子深度分布,分析不同高寬比對平屋面屋面粒子深度分布的影響和屋面坡度對雙坡屋面粒子深度分布的影響。(6)將積雪分布的數(shù)值仿真結(jié)果與風洞試驗的相關(guān)結(jié)果進行對比分析。
[Abstract]:Sudden snow disasters will bring a great threat to people's production and life, and a large number of uneven snow loads on the roof will lead to the collapse of the housing structure. This paper reviews the relevant studies at home and abroad, summarized. The basic theory of wind-induced snow drift is summarized in this paper. From the aspects of numerical simulation and wind tunnel test, the characteristics of snow cover distribution in roof are studied emphatically. A numerical simulation method is proposed in this paper. The main work of this paper is as follows: 1). A numerical simulation method based on Mixture two-phase flow model and quasi-static method provided by FLUENT is established. At the same time, the effects of snow prelay and angle of repose are considered. The 2D flat roof model in literature is used to do two-dimensional simulation, and the numerical simulation method is verified. 2) the three-dimensional flat roof is numerically simulated. The characteristics of particle depth distribution in flat roof and the influence of model height to width ratio on the depth distribution of roof particles are analyzed. The characteristics of particle depth distribution on double slope roof and the influence of roof gradient on the depth distribution of roof particles are analyzed. (4) from geometry, starting condition, motion and time, etc. The similarity rate to be satisfied in wind drift wind tunnel test is analyzed. 5) the quartz sand is used as the particle of snow model. Wind tunnel tests were carried out on three three dimensional flat roofs with different aspect ratios and two double sloping roofs with different slopes. The flow field characteristics and the angle of repose of quartz sand under different nominal wind speeds were measured respectively. Wind tunnel tests of snow cover distribution on roof under several working conditions were carried out in two groups of models, and the depth distribution of roof particles with different wind speed and time was measured respectively. The influence of height to width ratio on particle depth distribution of flat roof and the influence of roof slope on particle depth distribution of double slope roof are analyzed. The numerical simulation results of snow cover distribution are compared with those of wind tunnel test.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU312.1

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