發(fā)布時(shí)間：2018-06-05 14:17

  本文選題：雙螺桿壓縮機(jī) + 內(nèi)部流場仿真　； 參考：《陜西理工大學(xué)》2017年碩士論文

【摘要】：空氣因其輸送方便、無污染的特點(diǎn)被廣泛應(yīng)用于雙螺桿壓縮機(jī)中,雙螺桿空氣壓縮機(jī)設(shè)備應(yīng)運(yùn)而生,成為農(nóng)業(yè)、工業(yè)、能源等眾多行業(yè)的新寵。但由于其內(nèi)部結(jié)構(gòu)復(fù)雜、空間狹小,空氣的真實(shí)流動(dòng)難以通過實(shí)驗(yàn)測量,于是吸引了許多業(yè)內(nèi)人士對其內(nèi)部空氣流動(dòng)特性進(jìn)行研究;此外,現(xiàn)代計(jì)算機(jī)技術(shù)的發(fā)展彌補(bǔ)了這一缺陷,通過計(jì)算機(jī)軟件對壓縮機(jī)內(nèi)部流場進(jìn)行數(shù)值模擬可有效追蹤氣體在其內(nèi)部的真實(shí)流動(dòng)情況。轉(zhuǎn)子副是螺桿壓縮機(jī)的核心部件,其運(yùn)動(dòng)形態(tài)主要取決于轉(zhuǎn)子所處的流場環(huán)境,反之,流場特性又影響著轉(zhuǎn)子的運(yùn)動(dòng)形態(tài)。為確保轉(zhuǎn)子系統(tǒng)安全工作,進(jìn)一步提高螺桿壓縮機(jī)的工作性能。通過SolidWorks建立轉(zhuǎn)子的三維虛擬模型,采用Fluent對壓縮機(jī)內(nèi)部流場進(jìn)行仿真計(jì)算,并得到轉(zhuǎn)子副在流固耦合下的熱變形分布,從而為合理設(shè)置轉(zhuǎn)子補(bǔ)償間隙提供了依據(jù)。主要內(nèi)容安排如下:1.建立了雙螺桿壓縮機(jī)內(nèi)部流場的計(jì)算域模型。基于流體流動(dòng)理論,結(jié)合壓縮機(jī)的實(shí)際運(yùn)行工況,得到壓縮機(jī)內(nèi)部流場的計(jì)算域模型:進(jìn)氣通道、壓縮腔和排氣通道。2.雙螺桿壓縮機(jī)內(nèi)部流場分析。采用Mesh模塊對流體模型進(jìn)行網(wǎng)格劃分,在Fluent中進(jìn)行相應(yīng)的動(dòng)網(wǎng)格、邊界條件和求解條件設(shè)置,最終得到不同時(shí)刻氣流場壓力、速度、溫度的分布規(guī)律。3.雙螺桿轉(zhuǎn)子的流固耦合熱力變形分析�；诹鞴恬詈狭W(xué)分析理論,結(jié)合熱力學(xué)原理對轉(zhuǎn)子建立流固耦合傳熱模型,得到轉(zhuǎn)子在溫度場和力場綜合作用下的變形分布。4.壓縮機(jī)泄漏機(jī)理分析。從轉(zhuǎn)子形成原理分析壓縮機(jī)的間隙分布并建立相應(yīng)的泄露模型,提出四種間隙補(bǔ)償方法并結(jié)合陜西漢江機(jī)床有限公司轉(zhuǎn)子加工實(shí)驗(yàn)進(jìn)行研究。本文基于流體力學(xué)、空氣動(dòng)力學(xué)理論,結(jié)合熱力學(xué)原理,借助計(jì)算機(jī)軟件對雙螺桿壓縮機(jī)進(jìn)行建模仿真,實(shí)現(xiàn)了對其內(nèi)部空氣流動(dòng)的有效追蹤。分析結(jié)果對優(yōu)化壓縮機(jī)結(jié)構(gòu)、改善壓縮機(jī)性能有一定的參考價(jià)值。
[Abstract]:Air is widely used in twin-screw compressor because of its convenient transportation and no pollution. The equipment of twin-screw air compressor has emerged as the times require, and has become a new favorite in many industries such as agriculture, industry, energy and so on. However, due to its complex internal structure and narrow space, it is difficult to measure the real flow of air through experiments, so it attracts many people in the industry to study its internal air flow characteristics; in addition, The development of modern computer technology makes up for this defect. Numerical simulation of the internal flow field of compressor can effectively track the real flow of gas in the compressor by computer software. Rotor pair is the core component of screw compressor, and its motion pattern mainly depends on the flow field environment of the rotor. On the contrary, the flow field characteristics affect the rotor motion pattern. In order to ensure the safety of rotor system, the working performance of screw compressor is further improved. The three-dimensional virtual model of rotor is established by SolidWorks, and the flow field of compressor is simulated by fluent, and the thermal deformation distribution of rotor pair under fluid-solid coupling is obtained, which provides the basis for setting rotor compensation clearance reasonably. The main contents are as follows: 1. The calculation domain model of internal flow field of twin screw compressor is established. Based on the fluid flow theory and combined with the actual operating conditions of the compressor, the computational domain models of the internal flow field of the compressor are obtained: intake channel, compression chamber and exhaust channel. Analysis of internal flow field of twin screw compressor. Mesh module is used to mesh the fluid model, and the corresponding moving mesh, boundary condition and solution condition are set in fluent. Finally, the distribution law of pressure, velocity and temperature of air flow field at different time is obtained. Analysis of fluid-solid coupled Thermodynamic deformation of Twin-screw rotor. Based on the theory of fluid-solid coupling mechanics and thermodynamics, the fluid-solid coupling heat transfer model of rotor is established, and the deformation distribution of rotor under the combined action of temperature field and force field is obtained. Mechanism analysis of compressor leakage. According to the principle of rotor formation, the clearance distribution of compressor is analyzed and the corresponding leakage model is established. Four kinds of gap compensation methods are put forward and combined with the rotor machining experiment of Shaanxi Hanjiang Machine tool Co., Ltd. Based on the theory of hydrodynamics and aerodynamics and the principle of thermodynamics, this paper models and simulates the twin screw compressor with the aid of computer software, and realizes the effective tracing of the internal air flow. The analysis results have certain reference value for optimizing compressor structure and improving compressor performance.
【學(xué)位授予單位】：陜西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH45

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