本文關(guān)鍵詞： 軸流風(fēng)扇 波浪翼型葉片 數(shù)值計(jì)算 氣動(dòng)性能 流動(dòng)控制　出處：《武漢理工大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：軸流風(fēng)扇在工農(nóng)業(yè)生產(chǎn)與生活中普遍使用,風(fēng)扇葉片作為風(fēng)扇的能量交換元件,其形狀直接影響葉片附近的渦流強(qiáng)度,包含著許多復(fù)雜的流動(dòng)機(jī)理,葉片的氣動(dòng)性能直接影響風(fēng)扇的工作效率、運(yùn)行壽命及噪聲。隨著現(xiàn)代生活對(duì)節(jié)能、環(huán)保及低噪等要求日益提高,如何有效提高風(fēng)扇葉片的氣動(dòng)性能,借以提高其工作效率是人們長(zhǎng)期關(guān)注的課題。 本文以軸流風(fēng)扇葉片為研究對(duì)象,以提高其氣動(dòng)性能和降低噪聲為目標(biāo),提出了一種新型的可延緩失速的波浪翼型葉片。通過計(jì)算流體力學(xué)軟件FLUENT對(duì)標(biāo)準(zhǔn)NACA0012翼型和波浪翼型葉片進(jìn)行三維數(shù)值計(jì)算對(duì)比分析,研究了翼型葉片在不同攻角下(0°≤α≤20。)的氣動(dòng)性能及其復(fù)雜的三維流動(dòng)結(jié)構(gòu),同時(shí)進(jìn)一步研究了波浪翼型葉片在提高標(biāo)準(zhǔn)NACA0012翼型葉片升力及延緩其失速方面的物理機(jī)制。研究發(fā)現(xiàn)：與標(biāo)準(zhǔn)NACA0012翼型葉片相比,波浪翼型葉片由于其前后緣及上下表面沿展向呈正弦波浪型變化,延緩了最大截面處前緣的流動(dòng)分離,并使得其在失速區(qū)均得到了更為平緩的升力系數(shù)曲線。在小攻角(a12°)工況下,標(biāo)準(zhǔn)NACA0012翼型葉片的升力系數(shù)稍大,然而當(dāng)攻角增大(a12°)時(shí),波浪翼型葉片升力系數(shù)明顯提高,最高可達(dá)20%。在此基礎(chǔ)上,利用PRO/E構(gòu)建了葉片數(shù)與安裝角相組合的九種軸流風(fēng)扇模型,探討不同翼型葉片數(shù)及安裝角對(duì)軸流風(fēng)扇氣動(dòng)性能的影響機(jī)制,進(jìn)一步討論波浪翼型葉片在工程應(yīng)用方面的可適用性,通過比較風(fēng)扇內(nèi)流場(chǎng)的跡線和護(hù)風(fēng)圈渦量分布,發(fā)現(xiàn)波浪翼型風(fēng)扇并非在本文中的所有參數(shù)下均能改善標(biāo)準(zhǔn)葉片風(fēng)扇的氣動(dòng)性能,只有當(dāng)安裝角大于15°時(shí)才有改善效果,同時(shí)發(fā)現(xiàn)波浪翼型風(fēng)扇在五葉片18°安裝角下的氣動(dòng)性能改善最大。綜上研究表明波浪翼型葉片能夠有效地改善軸流風(fēng)扇氣動(dòng)性能,取得良好的實(shí)際應(yīng)用效果。
[Abstract]:Axial flow fan is widely used in industrial and agricultural production and life. Fan blade as an energy exchange element, its shape directly affects the eddy current intensity near the blade, including many complex flow mechanism. The aerodynamic performance of the blade directly affects the efficiency, service life and noise of the fan. With the increasing requirements of energy saving, environmental protection and low noise in modern life, how to effectively improve the aerodynamic performance of the fan blade. To improve the efficiency of its work is a long-term concern of people. In this paper, the axial flow fan blade as the research object, to improve its aerodynamic performance and reduce noise as the goal. A new type of wave airfoil blade which can delay stall is proposed. The standard NACA0012 airfoil and the wave airfoil blade are calculated and compared with each other by the computational fluid dynamics software FLUENT. The aerodynamic performance and the complex three-dimensional flow structure of airfoil blade with 0 擄鈮，

本文編號(hào)：1469432