本文選題：射流泵 + 單一變量法��； 參考：《西南石油大學》2017年碩士論文

【摘要】：射流泵是一種利用高速射流作為動力來傳遞動能和質量的流體機械和混合反應設備,其本身沒有運動部件,具有結構簡單、安裝方便、工作可靠、壽命長等優(yōu)點,在許多工藝流程中應用具有優(yōu)越性和不可替代性,在國民經(jīng)濟的發(fā)展中起著重要的作用。但射流泵的缺點是由于工作流體(射流)和被吸流體(引射流體)混合能量損失很大,導致泵的效率較低,這在一定程度限制了射流泵的應用范圍。本文利用有限元軟件FLUENT17.0對液氣射流泵內部流場進行模擬,研究喉嘴距、面積比、噴嘴結構和噴嘴安裝形式等結構形式和不同工況對射流泵流場分布規(guī)律的影響,尋求射流泵效率較高時的結構參數(shù)和合理工況。主要開展以下工作:以單一變量法為基礎,構建不同喉嘴距和面積比下液氣射流泵流體域模型,導入到ICEM-CFD中進行網(wǎng)格劃分并設定射流泵的各種邊界,選擇Mixture多相流模型和標準k-ε湍流模型來進行數(shù)值模擬。利用CFD-Post提取泵內壓力和速度分布云圖,提取進出口壓力和質量流量數(shù)據(jù)。對不同結構尺寸(面積比、喉嘴距)液氣射流泵的流場性能進行比較分析,以效率較優(yōu)為目標,得到較優(yōu)喉嘴距和面積比。在較優(yōu)喉嘴距和面積比下,將余弦、圓錐和圓柱噴嘴的性能進行對比,得出圓柱噴嘴射流泵的壁面壓力變化和軸線上的壓力變化較余弦、圓錐噴嘴射流泵更大,由于工作流體經(jīng)過其收縮斷面,能量損失較大,效率相對余弦、圓錐噴嘴低。余弦和圓錐噴嘴射流泵流場特性相近,考慮到余弦噴嘴不易加工,射流泵采用圓錐噴嘴更合理。在較優(yōu)喉嘴距和面積比下,考察多噴嘴液氣射流泵內部流場特性,設計了圓形三噴嘴、三角形三噴嘴、環(huán)向四噴嘴、中心四噴嘴和六噴嘴這五種多噴嘴射流泵,并使多噴嘴的噴嘴出口總面積等于單噴嘴且在同樣邊界條件下模擬。本次設計的多噴嘴效率整體低于單噴嘴,說明多噴嘴不總是可以提高泵的效率,噴嘴自身的結構和布置形式會影響泵的效率。對比研究了平行六噴嘴和2種傾斜角度不同的聚焦六噴嘴射流泵的效率,得出聚焦多噴嘴可以提高泵的效率,噴嘴傾斜角越大,越有利于射流進行交匯,形成的高速流核區(qū)向前推進的距離越大,越有利于水射流與氣體混合,提高泵的效率。研究不同工況下射流泵的性能,依次改變工作流體壓力和混合流體出口壓力,尋求合理的工況。得出過高或過低工作流體壓力會降低泵的效率;適當減小混合流體出口壓力能提高射流泵的效率,但出口壓力過大會降低泵的效率。所以需要嚴格控制泵的進口壓力和出口壓力,才正常保證泵正常乃至高效運行�？傊�,本文通過對液氣射流泵內部流場進行數(shù)值模擬,對比研究喉嘴距、面積比、噴嘴形狀、噴嘴個數(shù)噴嘴、布置形式和不同工況(不同工作流體壓力和混合流體出口壓力)流場分布規(guī)律,可為射流泵選擇較優(yōu)的結構參數(shù)和合理的運行工況,研究結論可為射流泵的設計提供一定理論依據(jù)。
[Abstract]:The jet pump is a kind of fluid machinery and mixed reaction equipment which uses high speed jet as power to transfer kinetic energy and mass. It has no moving parts in itself. It has the advantages of simple structure, easy installation, reliable work and long life. It has advantages and irreplaceable application in many process processes. It plays a role in the development of the national economy. But the shortcoming of the jet pump is that the loss of the mixing energy of the working fluid (jet) and the absorbed fluid (the ejected fluid) is very low, which leads to the low efficiency of the pump. This restricts the application range of the jet pump to a certain extent. This paper uses the finite element software FLUENT17.0 to simulate the internal flow field of the liquid gas jet pump, and study the throat distance and area. The structure parameters and reasonable working conditions of the jet pump are sought by the structure of the nozzle structure and the nozzle installation form and the different working conditions on the flow field distribution of the jet pump. The following work is carried out mainly: Based on the single variable method, the fluid field model of the liquid gas jet pump under the different throat and area ratio is constructed and introduced into the IC In EM-CFD, the grid is divided and the various boundaries of the jet pump are set, and the Mixture multiphase flow model and the standard k- e turbulence model are selected for numerical simulation. The pressure and velocity distribution in the pump are extracted by CFD-Post, and the pressure and mass flow data are extracted. The flow field of the liquid gas jet pump with different structure scale (area ratio, throat distance) The performance is compared and analyzed. The better throat and area ratio are obtained. Under the better throat and area ratio, the performance of the cosine, cone and cylindrical nozzle is compared, and the wall pressure change of the jet pump and the pressure on the axis are changed to the cosine, the jet pump of the cone nozzle is larger, because of the workflow. Through its contraction section, the energy loss is larger, the efficiency is relative cosine, the conical nozzle is low. The flow field characteristics of the cosine and conical nozzle are similar. Considering that the cosine nozzle is not easy to be machined, the jet pump is more reasonable with the cone nozzle. Under the better throat and area ratio, the flow field characteristics of the multi nozzle liquid gas jet pump are investigated and the circle is designed. Three nozzles, triangular three nozzles, ring four nozzles, center four nozzles and six nozzles are the five multi nozzle jet pumps. The total area of the nozzle outlet is equal to the single nozzle and is simulated under the same boundary conditions. The design of the multi nozzle efficiency is lower than the single nozzle. It is said that the nozzle is not always able to improve the efficiency of the pump. The structure and layout of the body will affect the efficiency of the pump. The efficiency of the parallel six nozzle and 2 different focus six nozzle jet pumps is compared and studied. It is concluded that the focus multiple nozzles can improve the efficiency of the pump. The greater the inclination angle of the nozzle, the more conducive to the convergence of the jet. It is beneficial to the mixing of water jet and gas to improve the efficiency of the pump. To study the performance of the jet pump under different working conditions, to change the pressure of the working fluid and the pressure of the mixed fluid outlet in turn, to find a reasonable working condition. It is concluded that the efficiency of the pump will be reduced by high or low working fluid pressure, and the efficiency of the jet pump can be improved by proper Jian Xiaohun fluid outlet pressure, but the efficiency of the jet pump can be improved. It is necessary to strictly control the inlet pressure and outlet pressure of the pump so as to ensure the normal and efficient operation of the pump. In a word, through the numerical simulation of the internal flow field of the liquid and gas jet pump, this paper compares the throat distance, the area ratio, the nozzle shape, the nozzle number nozzle, the layout form and the different work. The distribution of flow field (different working fluid pressure and mixed fluid outlet pressure) can choose better structural parameters and reasonable operating conditions for the jet pump, and the conclusion can provide a certain theoretical basis for the design of the jet pump.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH38

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本文編號：2002054