發(fā)布時間：2018-03-04 20:45

  本文選題：太陽能利用　切入點：噴射式制冷　出處：《青島大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著經(jīng)濟的發(fā)展,人類對能源的需求越來越大,加上開發(fā)消耗常規(guī)能源帶來的一系列環(huán)境問題,使得新能源開發(fā)利用受到越來越大的關(guān)注。其中,太陽能因其資源豐富、無需運輸、對環(huán)境無任何污染等優(yōu)勢成為了各行業(yè)開發(fā)利用的重點。 太陽能噴射式制冷具有優(yōu)于其他制冷方式的特點,該系統(tǒng)操作簡單,幾乎無運動部件,運行穩(wěn)定,使用壽命長。所以,本文針對太陽能噴射式制冷系統(tǒng)展開研究,以制冷系統(tǒng)中常用的制冷劑為工質(zhì),分析了該系統(tǒng)的整體性能,并對其中的噴射器進行了三維數(shù)值模擬。 本文首先從太陽能噴射式制冷系統(tǒng)性能、蒸汽噴射器的二維與三維數(shù)值模擬等方面綜述了其在國內(nèi)外的發(fā)展與研究現(xiàn)狀,提出了本文研究的主要內(nèi)容；然后理論上分析了該系統(tǒng)的性能隨制冷劑種類、工作參數(shù)的變化趨勢；接著根據(jù)索科洛夫闡述的蒸汽噴射器設(shè)計的原理和方法,對噴射器進行了結(jié)構(gòu)設(shè)計,并利用FLUENT軟件進行三維數(shù)值計算。結(jié)果表明：噴射器的噴射系數(shù)隨著工作流體和引射流體的壓力升高而增大,隨著出口壓力的升高而減��；而且隨著工作流體壓力的升高,噴射系數(shù)的增大趨勢逐漸減弱；引射流體過低或混合流體出口壓力過高時,工作流體都不能引射被引射流體,即噴射器不能工作;噴嘴擴張角在8-16°變化時噴射系數(shù)比較理想；噴嘴的收縮角在30～40°范圍內(nèi)變化時噴射系數(shù)較好；噴射器的喉部截面積比對噴射系數(shù)影響很大,該值過低時噴射器不能工作,過大時噴射系數(shù)迅速降低；流線型結(jié)構(gòu)可以提高噴射器性能,它的彎曲程度對噴射器性能影響很�。粐娮斐隹趲�(dǎo)流段有助于噴射器性能的提高。
[Abstract]:With the development of economy, the demand for energy is increasing. In addition, a series of environmental problems caused by the development and consumption of conventional energy make the development and utilization of new energy receive more and more attention. Among them, solar energy is rich in resources. No need to transport, no pollution to the environment and other advantages have become the focus of development and utilization of various industries. Solar ejector refrigeration has the advantages of simple operation, almost no moving parts, stable operation and long service life. Therefore, the research on solar ejector refrigeration system is carried out in this paper. Based on the refrigerant commonly used in the refrigeration system, the overall performance of the system is analyzed, and the ejector in the system is numerically simulated. Firstly, this paper summarizes the development and research status of solar ejector refrigeration system from the aspects of performance, 2D and 3D numerical simulation of steam ejector, and puts forward the main contents of this paper. Then the change trend of the system performance with the refrigerant type and working parameters is analyzed theoretically, and then the structure of the ejector is designed according to the principle and method of steam ejector designed by Sokolov. The results show that the injection coefficient increases with the pressure of the working fluid and the ejector fluid, decreases with the increase of the outlet pressure, and increases with the increase of the working fluid pressure. The increasing trend of the jet coefficient gradually weakens, when the ejection fluid is too low or the outlet pressure of the mixed fluid is too high, the working fluid can not be ejected into the ejected fluid, that is, the ejector cannot work, and the jet coefficient is ideal when the nozzle expansion angle varies from 8 to 16 擄. The jet coefficient is better when the constriction angle of the nozzle changes in the range of 30 擄40 擄, and the throat sectional area of the injector has a great influence on the jet coefficient. When the value is too low, the ejector can not work, and the jet coefficient decreases rapidly when the nozzle is too large. The streamline structure can improve the performance of the ejector, and its bending degree has little effect on the performance of the ejector, and the nozzle outlet with the diversion section is helpful to improve the performance of the ejector.
【學(xué)位授予單位】：青島大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB657

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