發(fā)布時間：2018-07-25 17:12

【摘要】：錐閥具有密封性能好、過流能力強、響應快、抗污染能力強等特點,在流體輸送中得到了廣泛的應用。本文在調(diào)研了大量國內(nèi)外有關(guān)文獻資料的基礎(chǔ)上,針對錐閥存在的能量損失大、能量利用率低、噪音大等問題進行了數(shù)值計算與研究。 本文運用PHOENICS流體計算軟件,建立了與實際所用錐閥相同的物理結(jié)構(gòu)和參數(shù)的計算幾何模型,采用了結(jié)構(gòu)化正交局部加密網(wǎng)格,應用了k -ε湍流計算模型,分別對外流式和內(nèi)流式錐閥內(nèi)部流場進行了數(shù)值模擬計算,研究了流量變化、開啟度變化對錐閥流場特性的影響,并利用Sci、Origin等后處理軟件對模擬結(jié)果的數(shù)據(jù)、圖片做了處理,得到了錐閥內(nèi)部流場的速度和壓力分布情況,并對模擬結(jié)果進行了分析,得到能量損失、噪音與流道結(jié)構(gòu)之間的關(guān)系。在此基礎(chǔ)上,對錐閥的流場結(jié)構(gòu)進行優(yōu)化,提出了流道優(yōu)化設(shè)計方案,并進行CFD解析,驗證了其優(yōu)化方案的可行性,同時,在其它條件不變的情況下,研究了流量、開啟度與流量系數(shù)之間的關(guān)系,給出了不同流量下和不同開啟度下的流量系數(shù)變化規(guī)律。 本文的研究結(jié)果,對于分析錐閥的性能、進行流道的結(jié)構(gòu)優(yōu)化和實際工程應用都具有一定的指導作用。
[Abstract]:Cone valve has been widely used in fluid transportation because of its good sealing performance, strong overcurrent capacity, fast response and strong anti-pollution ability. Based on a large number of literatures at home and abroad, this paper has carried out numerical calculation and research on the problems of large energy loss, low energy utilization ratio and large noise in conical valves. In this paper, the computational geometry model of the same physical structure and parameters as the practical cone valve is established by using the PHOENICS fluid calculation software. The structured orthogonal locally encrypted grid is used, and the k-蔚 turbulence calculation model is applied. The internal flow field of external flow valve and internal flow cone valve were numerically simulated, and the effects of flow rate change and opening change on the flow field characteristics of cone valve were studied. The data of simulation results were processed by using SciCon Origin and other post-processing software. The velocity and pressure distribution of the flow field in the cone valve is obtained, and the simulation results are analyzed, and the relationship between energy loss, noise and the flow channel structure is obtained. On this basis, the flow field structure of the conical valve is optimized, the flow channel optimization design scheme is put forward, and the CFD analysis is carried out to verify the feasibility of the optimization scheme. At the same time, the flow rate is studied under the condition that other conditions remain unchanged. The relationship between the opening degree and the flow coefficient, and the variation law of the flow coefficient under the different flow rate and the different opening degree are given. The results of this paper can be used to analyze the performance of conical valve, optimize the structure of flow channel and practical engineering application.
【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH134

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本文編號：2144492