基于三維數(shù)值模擬的后向離心通風(fēng)機(jī)葉片葉型研究
本文關(guān)鍵詞:基于三維數(shù)值模擬的后向離心通風(fēng)機(jī)葉片葉型研究 出處:《浙江理工大學(xué)》2017年碩士論文 論文類型:學(xué)位論文
更多相關(guān)文章: 離心通風(fēng)機(jī) 葉片設(shè)計 葉片進(jìn)口邊 速度分布法 載荷分布法 三元葉片
【摘要】:作為提供氣體動力的重要設(shè)備,在國民經(jīng)濟(jì)中,離心通風(fēng)機(jī)在鋼鐵、能源、電力、煤礦、化工等眾多專業(yè)領(lǐng)域中被廣泛應(yīng)用。但由于受國內(nèi)研發(fā)水平、制造工藝等多種因素的影響,現(xiàn)行離心通風(fēng)機(jī)的工作效率并不高。近年來,人們已經(jīng)逐步意識到提高能源的利用率對于經(jīng)濟(jì)社會的可持續(xù)發(fā)展至關(guān)重要。因此,從節(jié)約資源的角度來說,設(shè)計一款運(yùn)行效率較高的離心通風(fēng)機(jī)顯得極為重要。為了研究如何提高離心通風(fēng)機(jī)的運(yùn)行效率,本文研究使用的風(fēng)機(jī)是合作單位提供的4-79-7C型離心通風(fēng)機(jī),主要采用計算軟件來對該型通風(fēng)機(jī)的流場進(jìn)行模擬計算,通過分析原始通風(fēng)機(jī)的流場情況,來對離心通風(fēng)機(jī)的葉片進(jìn)行改進(jìn)與設(shè)計。本論文的主要研究內(nèi)容有以下的三個部分:(1)使用計算模擬軟件對4-79-7C型離心通風(fēng)機(jī)的運(yùn)行工況進(jìn)行計算,并研究了不同葉片出口邊角度這一參數(shù),分析其對該型離心通風(fēng)機(jī)性能的影響。研究結(jié)果顯示,當(dāng)葉片進(jìn)口邊的角度為6°的時候,此時的離心通風(fēng)機(jī)的模型相比于原模型在額定工況附近的靜壓效率得到了提高;同時發(fā)現(xiàn),越靠近風(fēng)機(jī)輪蓋處的截面,氣體流動的損失越大,為后續(xù)對該通風(fēng)機(jī)葉片的優(yōu)化改進(jìn)提供了前期基礎(chǔ)。(2)根據(jù)該型離心通風(fēng)機(jī)內(nèi)部流動的特點,在不改變?nèi)~輪寬度和葉輪高度的情況下,分別采用速度分布法和載荷分布法這兩種方法來對該型離心通風(fēng)機(jī)的葉片進(jìn)行重新設(shè)計,然后分析對比原風(fēng)機(jī)與采用兩種方法設(shè)計的葉片的風(fēng)機(jī)的性能。結(jié)果發(fā)現(xiàn),采用這兩種方法設(shè)計的風(fēng)機(jī)的總壓與效率與原模型相比都有了顯著的提高,而且采用速度分布法設(shè)計的葉片的效果更好。(3)根據(jù)前兩部分的研究基礎(chǔ)與研究結(jié)論,將第二部分使用速度分布法設(shè)計的風(fēng)機(jī)模型進(jìn)一步優(yōu)化,對葉輪輪蓋處氣流流動不合理的地方提出進(jìn)一步改善的方法。主要對輪蓋側(cè)的葉片型線重新設(shè)計,設(shè)計獲得了三元扭曲形狀的葉片,并通過三維數(shù)值模擬軟件計算優(yōu)化后模型的運(yùn)行工況,來驗證其性能的提高。
[Abstract]:As an important equipment to provide gas power, centrifugal fans are widely used in many professional fields such as steel, energy, electricity, coal mine, chemical industry and so on in the national economy, but due to the level of domestic R & D. Due to the influence of manufacturing process and other factors, the efficiency of centrifugal fan is not high. In recent years, people have gradually realized that improving energy efficiency is very important to the sustainable development of economic society. From the point of view of saving resources, it is very important to design a centrifugal fan with high operating efficiency. In order to study how to improve the operation efficiency of centrifugal fan. The fan studied and used in this paper is 4-79-7C centrifugal ventilator provided by cooperative unit. The flow field of this type fan is simulated and calculated by computer software. The flow field of the original fan is analyzed. To improve and design the blade of centrifugal fan. The operating conditions of 4-79-7C centrifugal fan are calculated by using the computer simulation software. The influence of different angle of blade outlet edge on the performance of centrifugal fan is analyzed. The results show that when the angle of blade inlet edge is 6 擄. Compared with the original model, the static pressure efficiency of the centrifugal fan is improved. At the same time, it is found that the closer the cross-section of the fan wheel cover, the greater the loss of gas flow, which provides a preliminary foundation for further optimization and improvement of the fan blade. (2) according to the characteristics of internal flow of this type centrifugal fan. Without changing the width and height of the impeller, the speed distribution method and the load distribution method are used to redesign the blade of the centrifugal fan. The results show that the total pressure and efficiency of the blower designed by the two methods are significantly improved compared with the original model. And the blade designed by velocity distribution method has better effect. According to the research foundation and conclusion of the first two parts, the fan model designed by the velocity distribution method in the second part is further optimized. The method of further improvement is put forward for the unreasonable air flow in the impeller cover. The blade profile of the cover side of the impeller is redesigned and the three dimensional twisted blade is designed. The improved performance of the model is verified by calculating the operating conditions of the optimized model by the three dimensional numerical simulation software.
【學(xué)位授予單位】:浙江理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TH432
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