【摘要】：液環(huán)泵因為具有構造簡單、等溫壓縮、使用維修便利、適合應用于抽吸和壓縮易燃易爆氣體,被普遍應用于化工、煤礦、制藥、石化、發(fā)電、飲食以及廢氣的回收等行業(yè)范圍中。由于其廣泛的使用性能,研究者們對其做了深入細致的分析研究,通過研究了解得知,對液環(huán)泵性能產生影響的結構參數(shù)有很多,如葉輪、殼體型線、吸氣口的形狀大小、排氣口的位置形狀及噴射器等,這些都可能嚴重影響液環(huán)泵的性能。但是這些年,國內外研究者大多只是對液環(huán)泵的內部流動數(shù)值計算以及噴射器的影響,做了大量的研究,可是就殼體型線對液環(huán)泵性能的影響,這方面的分析研究還不是很充分。因此,本文的主要工作是通過優(yōu)化液環(huán)泵的殼體型線,以達到優(yōu)化液環(huán)泵性能的目的。提出一種新的液環(huán)泵殼體型線的變形控制方法,結合響應面方法,進行液環(huán)泵殼體型線的優(yōu)化研究。主要工作內容和成果如下:1.提出了一種新的液環(huán)泵殼體型線的變形控制方法——基于直接自由曲面變形的液環(huán)泵殼體型線的變形控制方法,根據試驗設計要求,結合直接自由曲面變形方法的數(shù)學原理,構建有效的變形函數(shù),從而實現(xiàn)對殼體型線直接的、精確的參數(shù)化變形控制。2.根據響應面分析法。在控制變量空間上,對殼體型線進行試驗設計,并結合直接自由曲面變形方法進行殼體型線的變形控制。得到了液環(huán)泵殼體型線與其進口真空度和效率之間的關系,實現(xiàn)了對液環(huán)泵進口真空度及效率的優(yōu)化。算例結果表明:殼體型線對液環(huán)泵水力性能有較大的影響,在一定范圍內可實現(xiàn)泵效率及進口真空度提高,具有較大吸氣區(qū)面積擴散比的殼體型線所對應的液環(huán)泵具有較高的進口真空度,在試驗設計變量空間,泵的效率隨其進口真空度的增大近似呈線性下降趨勢。3.根據提出的直接自由曲面變形控制方法,編寫了基于直接自由曲面變形方法的液環(huán)泵殼體型線的變形控制計算程序,該方法可以比較理想的實現(xiàn)對物體的形狀變形。并編寫了液環(huán)泵殼體型線的響應面優(yōu)化分析程序,可以快速便捷實現(xiàn)對液環(huán)泵殼體型線的優(yōu)化。4.對液環(huán)泵殼體優(yōu)化結果表明液環(huán)泵的進口真空度在吸氣區(qū)始端隨著葉輪與殼體內壁間距的增大而減小,在吸氣區(qū)末端隨著葉輪與殼體內壁間距的增大而增大,進口真空度隨著吸氣區(qū)始端與末端間流道面積比值的增大而增大。效率的變化規(guī)律與之相反。
[Abstract]:Because of its simple structure, isothermal compression, convenient operation and maintenance, the liquid ring pump is suitable for suction and compression of flammable and explosive gases, and is widely used in chemical, coal, pharmaceutical, petrochemical, power generation, Food and waste gas recovery and other industries in the scope. Because of its extensive performance, the researchers have made a thorough and detailed analysis and study of it. Through the study, we know that there are many structural parameters that affect the performance of the liquid ring pump, such as the shape of the impeller, the shell line, and the suction port. The position and shape of the vent and ejector, which may seriously affect the performance of the liquid ring pump. However, in recent years, most researchers at home and abroad have done a lot of research on the numerical calculation of the internal flow of the liquid ring pump and the influence of the ejector, but on the influence of the shell line on the performance of the liquid ring pump, Analytical research in this area is not sufficient. Therefore, the main work of this paper is to optimize the performance of the liquid ring pump by optimizing the shell shape line of the liquid ring pump. A new deformation control method for the shape line of the liquid ring pump shell is proposed. The optimization of the shape line of the liquid ring pump shell is studied by combining the response surface method. The main contents and results are as follows: 1. A new deformation control method for the shape line of the liquid ring pump shell is presented, which is based on the deformation of the direct free surface. According to the requirements of the experimental design and the mathematical principle of the deformation method of the direct free surface, the deformation control method of the liquid ring pump shell shape line based on the deformation of the direct free surface is proposed. The effective deformation function is constructed to realize the direct and accurate parameterized deformation control of the shell profile. 2. According to response surface analysis. In the control variable space, the shell profile is tested and designed, and the deformation control of the shell profile is carried out with the method of direct free-form surface deformation. The relationship between the shape line of the liquid ring pump shell and its inlet vacuum degree and efficiency is obtained, and the inlet vacuum degree and efficiency of the liquid ring pump are optimized. The calculation results show that the shell line has a great influence on the hydraulic performance of the liquid ring pump, and the pump efficiency and inlet vacuum can be improved within a certain range. The liquid ring pump corresponding to the shell shape line with larger area diffusion ratio of suction area has higher inlet vacuum. In the experimental design variable space, the efficiency of the pump approximately decreases linearly with the increase of the inlet vacuum. 3. According to the direct free surface deformation control method, the deformation control calculation program of the liquid ring pump shell shape line based on the direct free surface deformation method is compiled. This method can realize the shape deformation of the object perfectly. The response surface optimization analysis program of the liquid ring pump shell shape line is compiled, which can quickly and conveniently realize the optimization of the liquid ring pump shell shape line. 4. The results of shell optimization show that the inlet vacuum of the liquid ring pump decreases with the increase of the distance between the impeller and the inner wall of the shell in the suction zone, and increases with the increase of the distance between the impeller and the inner wall of the shell at the end of the suction zone. The inlet vacuum increases with the increase of the flow channel area ratio between the beginning and the end of the suction zone. The law of change of efficiency is opposite to it.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB752

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