本文關(guān)鍵詞：基于數(shù)值模擬的單轉(zhuǎn)子葉片結(jié)構(gòu)對(duì)小型軸流風(fēng)扇性能的影響　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： 小型軸流風(fēng)扇 單轉(zhuǎn)子 不等節(jié)距葉片 進(jìn)口導(dǎo)葉 靜特性 噪聲 內(nèi)部流動(dòng)特性

【摘要】：小型軸流風(fēng)扇是目前電子產(chǎn)品的主要散熱設(shè)備,其性能直接決定電子產(chǎn)品的運(yùn)行狀況和使用壽命。隨著電子產(chǎn)品向集成化、大功率化方向發(fā)展,散熱需求日益增大,小型軸流風(fēng)扇的通風(fēng)性能和噪聲性能越來越引起人們的重視。因此,非常有必要對(duì)小型軸流風(fēng)扇進(jìn)行結(jié)構(gòu)優(yōu)化,并開展對(duì)其靜特性、氣動(dòng)噪聲和內(nèi)部流動(dòng)特性的分析研究。本文以5葉片單轉(zhuǎn)子小型軸流風(fēng)扇為原型,通過改進(jìn)單轉(zhuǎn)子葉片結(jié)構(gòu)分別設(shè)計(jì)出具有不同最大調(diào)制角位移的不等節(jié)距風(fēng)扇和具有不同進(jìn)口導(dǎo)葉出口角的進(jìn)口導(dǎo)葉風(fēng)扇。基于流場計(jì)算,在滿足靜特性要求的前提下選出降噪效果最好的不等節(jié)距風(fēng)扇和進(jìn)口導(dǎo)葉風(fēng)扇,分別記作模型1和模型2,對(duì)比分析了原型、模型1和原型、模型2的靜特性、氣動(dòng)噪聲和內(nèi)部流動(dòng)特性,完成了原型、模型1、模型2靜特性和噪聲的實(shí)驗(yàn)測試。論文的主要內(nèi)容及成果如下:(1)以5葉片單轉(zhuǎn)子小型軸流風(fēng)扇為原型,根據(jù)葉片角度調(diào)制法設(shè)計(jì)出13種具有不同最大調(diào)制角位移的不等節(jié)距風(fēng)扇,根據(jù)進(jìn)口導(dǎo)葉的設(shè)計(jì)要求設(shè)計(jì)出4種具有不同進(jìn)口導(dǎo)葉出口角的進(jìn)口導(dǎo)葉風(fēng)扇;簡述本文采用的數(shù)值模擬方法。(2)數(shù)值模擬的結(jié)果顯示:在額定工況下,最大調(diào)制角位移等于6°的不等節(jié)距風(fēng)扇和進(jìn)口導(dǎo)葉出口角等于60°的進(jìn)口導(dǎo)葉風(fēng)扇在滿足靜特性要求的前提下具有最優(yōu)的降噪效果,分別記作模型1和模型2。相比于原型,模型1的靜特性基本保持不變,而模型2的靜特性得到明顯提升。(3)流場的研究結(jié)果顯示:近場的噪聲以離散噪聲為主,主要由總壓脈動(dòng)引起,模型1和模型2均可以降低原型的近場離散噪聲;遠(yuǎn)場的噪聲以寬頻噪聲為主,與流場的渦量分布、渦量變化等因素有關(guān),兩種單轉(zhuǎn)子葉片結(jié)構(gòu)對(duì)原型的遠(yuǎn)場寬頻噪聲影響很小。(4)在風(fēng)洞實(shí)驗(yàn)臺(tái)上完成了原型、模型1和模型2的靜特性實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果顯示:數(shù)值模擬具有可靠性,最大調(diào)制角位移為6°的不等節(jié)距葉片沒有明顯改變?cè)偷撵o特性,而安裝出口角為60°的進(jìn)口導(dǎo)葉將原型在額定工況下的靜壓提升了1.8Pa。(5)在半消聲室中完成了原型、模型1和模型2的噪聲測試。實(shí)驗(yàn)結(jié)果顯示:相比于原型,模型1和模型2在風(fēng)扇下游軸向上的最大降噪均位于距離風(fēng)扇100mm的測試點(diǎn),降噪分別達(dá)到1.5dB和1.2dB;對(duì)于距離風(fēng)扇大于等于400mm的軸向測試點(diǎn),優(yōu)化模型的噪聲與原型基本保持一致。綜上所述,合理選擇單轉(zhuǎn)子小型軸流風(fēng)扇葉片的不等節(jié)距分布方式可以在靜特性基本保持不變的前提下降低近場的離散噪聲,而安裝具有適宜出口角的進(jìn)口導(dǎo)葉不僅可以明顯提升單轉(zhuǎn)子小型軸流風(fēng)扇的靜特性,還能降低近場的離散噪聲,改善內(nèi)部流動(dòng)特性。本文將對(duì)高靜特性低噪聲小型軸流風(fēng)扇的單轉(zhuǎn)子葉片結(jié)構(gòu)優(yōu)化提供依據(jù)。
[Abstract]:Small-sized axial fan is the main heat dissipation equipment of electronic products at present. Its performance directly determines the operation status and service life of electronic products. With the development of electronic products towards integration, high-power development. With the increasing demand for heat dissipation, people pay more and more attention to the ventilation performance and noise performance of the small axial fan. Therefore, it is very necessary to optimize the structure of the small axial fan and carry out its static characteristics. Analysis and study of aerodynamic noise and internal flow characteristics. This paper takes a small axial flow fan with a single rotor with 5 blades as the prototype. By improving the structure of single rotor blade, the different pitch fan with different maximum modulation angular displacement and the inlet guide fan with different inlet guide vane outlet angle are designed respectively. The flow field calculation is carried out. On the premise of satisfying the static characteristic requirements, the best noise reduction effect of unequal pitch fan and imported guide vane fan are selected, which are described as model 1 and model 2, respectively. The static characteristics of prototype, model 1 and prototype, model 2 are compared and analyzed. The prototype, model 1, model 2, static characteristics and noise are tested. The main contents and results of this paper are as follows: 1) A 5 blade single rotor small axial flow fan is used as the prototype. According to the blade angle modulation method, 13 kinds of unequal pitch fans with different maximum modulation angular displacement are designed, and 4 kinds of inlet guide vane fans with different inlet guide vane outlet angles are designed according to the design requirements of the imported guide vane. The numerical simulation method adopted in this paper is described briefly. 2) the results of numerical simulation show that: under rated working conditions. The maximum modulated angular displacement is equal to 6 擄with unequal pitch fan and the inlet guide vane fan with inlet guide vane outlet angle equal to 60 擄has the optimal noise reduction effect under the premise of satisfying the static characteristic requirement. Model 1 and model 2. Compared with the prototype, the static characteristics of model 1 remain basically unchanged. The results of model 2 show that the noise in the near field is mainly discrete noise, which is mainly caused by the total pressure pulsation. Both model 1 and model 2 can reduce the near-field discrete noise of the prototype. The far-field noise is mainly wideband noise, which is related to the vorticity distribution and vorticity variation of the flow field. Two single-rotor blade structures have little effect on the far-field wide-band noise of the prototype. The experimental results of model 1 and model 2 show that the numerical simulation is reliable, and the static characteristics of the prototype are not changed obviously when the maximum modulated angular displacement is 6 擄. The inlet guide vane with an outlet angle of 60 擄increases the static pressure of the prototype under rated working condition by 1.8 Pa. 5) and completes the prototype in the semi-anechoic chamber. The experimental results show that the maximum noise reduction of model 1 and model 2 in the downstream axial direction of the fan is located at the test point 100mm from the fan compared with the prototype. The noise reduction is 1.5 dB and 1.2 dB respectively; For the axial test point whose distance fan is greater than 400mm, the noise of the optimized model is basically consistent with the prototype. Reasonable selection of the unequal pitch distribution of a single rotor small axial flow fan blade can reduce the discrete noise in the near field on the premise that the static characteristics remain basically unchanged. The installation of inlet guide vane with suitable outlet angle can not only obviously improve the static characteristics of a small axial flow fan with a single rotor, but also reduce the discrete noise in the near field. In order to improve the internal flow characteristics, this paper will provide the basis for the optimization of the single rotor blade structure of Gao Jing low noise small axial flow fan.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH432.1;TB53

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