發(fā)布時(shí)間：2018-06-05 11:40

  本文選題：混合氣體分離 + 超音速��； 參考：《大連理工大學(xué)》2011年碩士論文

【摘要】：超音速分離技術(shù)(Super Sonic Separator,縮寫(xiě)為3S),是一種將氣體超音速低溫凝結(jié)效應(yīng)和旋流分離技術(shù)相結(jié)合而實(shí)現(xiàn)多組分氣體冷凝分離的混合氣體分離技術(shù)。與傳統(tǒng)的分離技術(shù)相比,具有等熵效率高,結(jié)構(gòu)簡(jiǎn)單,占地面積小,投資費(fèi)用低等優(yōu)點(diǎn)。但是,目前國(guó)內(nèi)外關(guān)于該項(xiàng)技術(shù)的研究報(bào)道很少,距離該技術(shù)的成熟應(yīng)用尚需一段時(shí)間。本文將對(duì)超音速分離器內(nèi)部流動(dòng)行為進(jìn)行研究,并在此基礎(chǔ)上對(duì)裝置結(jié)構(gòu)和操作參數(shù)影響裝置性能的規(guī)律進(jìn)行分析和總結(jié),以便為該技術(shù)的實(shí)際應(yīng)用提供理論依據(jù)和設(shè)計(jì)基礎(chǔ)。建立可描述氣體超音速流動(dòng)的二維數(shù)值模型,為超音速分離器的研究提供理論基礎(chǔ)；分析結(jié)構(gòu)參數(shù)和操作參數(shù)影響超音速分離裝置性能的規(guī)律,為超音速分離器實(shí)際運(yùn)行提供指導(dǎo)；建立超音速分離工藝流程,分析該工藝的優(yōu)缺點(diǎn),驗(yàn)證超音速分離技術(shù)的有效性。本文的主要研究工作及所形成的結(jié)果與結(jié)論如下： ①建立了可以模擬超音速分離器的二維和三維數(shù)值模型,通過(guò)對(duì)兩種模型的結(jié)構(gòu)進(jìn)行對(duì)比表明,二維模型能夠清晰表達(dá)超音速分離器內(nèi)部流動(dòng)狀況,與三維模型的結(jié)果差別不大,可以滿足對(duì)超音速分離器分析的需要。 ②通過(guò)分析噴管出口與喉部面積比、排液口當(dāng)量面積比、排液器內(nèi)傾角、錐芯等結(jié)構(gòu)參數(shù)對(duì)超音速噴管流動(dòng)的影響,得出以下結(jié)論：隨著噴管出口與喉部面積比的增加,噴管中溫降增大,Ma數(shù)平均值增加。面積比過(guò)小,氣流不能保持超音速狀態(tài)；面積比過(guò)大,噴管漸擴(kuò)段內(nèi)將產(chǎn)生激波,均不利于裝置運(yùn)行。一定壓比和面積比的情況下,過(guò)小的排液口當(dāng)量面積比將使得噴管漸擴(kuò)段內(nèi)產(chǎn)生激波,排液口前溫度驟升,不利于超音速分離器低溫冷凝。排液器內(nèi)傾角存在最佳值,增大排液器內(nèi)傾角,噴管工作段內(nèi)的氣流平均馬赫數(shù)減小,平均溫度增加；減小排液器傾角,雖然氣流溫度和馬赫數(shù)變化不大,但是流動(dòng)紊亂程度加劇,損失提高,兩者均不利于裝置形成低溫。通過(guò)對(duì)比有無(wú)錐芯的超音速分離器內(nèi)流場(chǎng)發(fā)現(xiàn),錐芯式超音速分離器結(jié)構(gòu)設(shè)計(jì)時(shí)需校核錐芯的粗細(xì),否則將出現(xiàn)不利于裝置低溫冷凝的現(xiàn)象。 ③通過(guò)分析裝置進(jìn)出口壓比、出口壓力以及旋流強(qiáng)度等操作參數(shù)對(duì)裝置內(nèi)流動(dòng)的影響,得出以下結(jié)論：其他參數(shù)一定,壓比減小,裝置模型內(nèi)氣流的馬赫數(shù)平均值減小,平均溫度增加,不利于裝置低溫冷凝,裝置對(duì)氣流操作條件也更加敏感,因此實(shí)際條件允許的情況下,應(yīng)提高進(jìn)出口的壓比以保障裝置穩(wěn)定運(yùn)行。一定面積比的情況下,適當(dāng)增加出口壓力能有效改善裝置內(nèi)氣流的流動(dòng)性能。通過(guò)改變旋流器的高度,可以實(shí)現(xiàn)超音速分離器裝置旋轉(zhuǎn)速度的增加和減小,是控制超音速分離性能的一種有效途徑。
[Abstract]:Super Sonic Separator (abbreviated as 3SN) is a mixed gas separation technology, which combines the low temperature condensation effect of supersonic gas with the swirl separation technology to realize the condensing separation of multi-component gases. Compared with the traditional separation technology, it has the advantages of high Isentropic efficiency, simple structure, small area and low investment cost. However, there are few reports on this technology at home and abroad, and it is still some time before its mature application. In this paper, the internal flow behavior of supersonic separator is studied, and on this basis, the influence of device structure and operating parameters on the performance of the device is analyzed and summarized in order to provide the theoretical basis and design basis for the practical application of the technology. A two-dimensional numerical model for describing supersonic gas flow is established, which provides a theoretical basis for the study of supersonic separators, and analyzes the effects of structural and operational parameters on the performance of supersonic separators. It provides guidance for the practical operation of supersonic separator, establishes supersonic separation process, analyzes its advantages and disadvantages, and verifies the effectiveness of supersonic separation technology. The main research work and the results and conclusions are as follows: 1 A two-dimensional and three-dimensional numerical model is established to simulate supersonic separators. The comparison of the structures of the two models shows that the two models can be used to simulate supersonic separators. The two-dimensional model can clearly express the internal flow situation of supersonic separator, which is not different from the result of three-dimensional model, and can meet the needs of supersonic separator analysis. 2 by analyzing the ratio of nozzle outlet to throat area, The effect of the equivalent area ratio of the outlet, the inclination angle of the drain and the cone core on the flow of the supersonic nozzle is discussed. The following conclusions are drawn: with the increase of the area ratio of the nozzle outlet to the throat, the average value of Ma number increases with the increase of the temperature drop in the nozzle. If the area ratio is too small, the airflow can not be kept supersonic, and if the area ratio is too large, shock waves will be produced in the expanding section of the nozzle, which is not conducive to the operation of the device. Under the condition of certain pressure ratio and area ratio, a small equivalent area ratio of the outlet will cause shock waves in the expanding section of the nozzle, and the temperature before the outlet will rise suddenly, which is not conducive to the cryogenic condensation of the supersonic separator. There is an optimum value of dip angle in the effluents. When the inclination angle increases, the average Mach number and mean temperature in the nozzle working section decrease, and the inclination angle decreases, although the air flow temperature and Mach number do not change much. However, the degree of flow disorder and loss are increased, both of which are not conducive to the formation of low temperature. By comparing the flow field of supersonic separator with or without cone core, it is found that the thickness of cone core should be checked in the structural design of supersonic separator with cone core, otherwise, the phenomenon of low temperature condensation will appear. 3 by analyzing the inlet and outlet pressure ratio of the device, The influence of operating parameters such as outlet pressure and swirl intensity on the flow in the device is obtained. The following conclusions are drawn: the other parameters are constant, the pressure ratio decreases, the Mach number average of the air flow in the device model decreases, and the average temperature increases. It is unfavorable to the low temperature condensation of the device and more sensitive to the air flow operating conditions, so the pressure ratio of the inlet and outlet should be increased to ensure the stable operation of the device if the actual conditions permit. Under the condition of a certain area ratio, properly increasing the outlet pressure can effectively improve the flow performance of the airflow in the device. By changing the height of the cyclone, the rotation speed of the supersonic separator can be increased and decreased, which is an effective way to control the supersonic separation performance.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH237.5

【引證文獻(xiàn)】

相關(guān)博士學(xué)位論文 前2條

1 劉恒偉;超音速分離管的研發(fā)及其流動(dòng)與傳熱傳質(zhì)特性的研究[D];北京工業(yè)大學(xué);2006年

2 馬慶芬;旋轉(zhuǎn)超音速凝結(jié)流動(dòng)及應(yīng)用技術(shù)研究[D];大連理工大學(xué);2009年

，

本文編號(hào)：1981867