本文選題：彎掠軸流風(fēng)機(jī) + 變型設(shè)計(jì)�。� 參考：《華中科技大學(xué)》2011年碩士論文

【摘要】：軸流風(fēng)機(jī)廣泛地應(yīng)用于各個(gè)行業(yè)并起著核心的作用，高效率、低噪聲的軸流風(fēng)機(jī)已有一些成熟的模型，但是每種型號(hào)的風(fēng)機(jī)都有其特定的最佳工況，當(dāng)被用于其他場(chǎng)合時(shí)就會(huì)出現(xiàn)規(guī)格或性能不匹配的問(wèn)題�；趶澛虞S流風(fēng)機(jī)的優(yōu)越性，本文將彎掠軸流風(fēng)機(jī)應(yīng)用于變壓器冷卻的高溫環(huán)境中，并提出了一種變型設(shè)計(jì)的方法解決性能不匹配的問(wèn)題。 獲得已有彎掠軸流風(fēng)機(jī)的結(jié)構(gòu)尺寸及試驗(yàn)數(shù)據(jù)，確定旋轉(zhuǎn)區(qū)域、進(jìn)口風(fēng)道、出口風(fēng)道等計(jì)算區(qū)域，，建立計(jì)算模型并進(jìn)行網(wǎng)格劃分，選擇合適的計(jì)算方法，對(duì)彎掠軸流風(fēng)機(jī)模型進(jìn)行了定常數(shù)值模擬并預(yù)測(cè)其外部性能。將預(yù)測(cè)及試驗(yàn)得到的風(fēng)機(jī)全壓-流量性能曲線在同一坐標(biāo)系中進(jìn)行比較，驗(yàn)證所選的數(shù)值模擬方法的正確性。 為滿足給定的流量和全壓要求，利用變型設(shè)計(jì)方法得到了彎掠軸流風(fēng)機(jī)的五種結(jié)構(gòu)方案A/B/C/D/E，采用同樣的計(jì)算方法預(yù)測(cè)它們的全壓-流量及全壓效率-流量性能曲線，篩選出了滿足流量和全壓要求且效率較高的B/E風(fēng)機(jī)。對(duì)五種風(fēng)機(jī)的葉輪軸向和徑向特征流面上的全壓和速度流線分布特性進(jìn)行了分析，進(jìn)一步驗(yàn)證了所篩選風(fēng)機(jī)的優(yōu)越性。E風(fēng)機(jī)葉輪加工完成后在進(jìn)口試驗(yàn)臺(tái)進(jìn)行了性能試驗(yàn)，驗(yàn)證篩選出的風(fēng)機(jī)可以滿足流量及全壓要求。 以穩(wěn)態(tài)流場(chǎng)為基礎(chǔ)，采用大渦模擬（LES）結(jié)合Lighthill聲類比的改進(jìn)方程——FW-H聲學(xué)模型的方法對(duì)篩選出的B/E風(fēng)機(jī)進(jìn)行非定常計(jì)算及氣動(dòng)噪聲預(yù)測(cè)。比較了遠(yuǎn)場(chǎng)噪聲測(cè)點(diǎn)D處聲壓級(jí)的預(yù)測(cè)值及試驗(yàn)值。分析了以葉輪表面作為噪聲源時(shí)B/E風(fēng)機(jī)的渦流噪聲頻譜特性，研究了風(fēng)機(jī)三維非定常內(nèi)部流場(chǎng)中旋渦分布特性，并探討了風(fēng)機(jī)旋轉(zhuǎn)區(qū)域內(nèi)部聲壓級(jí)的分布規(guī)律，證明E風(fēng)機(jī)滿足給定的噪聲要求。進(jìn)一步探討了E風(fēng)機(jī)在不同轉(zhuǎn)速時(shí)旋轉(zhuǎn)區(qū)域內(nèi)部不同位置氣動(dòng)噪聲的時(shí)域和頻域特性。 最后結(jié)合本文工作的總結(jié)及不足之處，提出了對(duì)彎掠軸流風(fēng)機(jī)氣動(dòng)噪聲進(jìn)行深入研究的方向。
[Abstract]:Axial flow fans are widely used in various industries and play a core role. High efficiency, low noise axial flow fans have some mature models, but each type of fan has its own specific optimal conditions.Specifications or performance mismatches occur when used in other situations.Based on the superiority of the bending-swept axial fan, this paper applies the bending-swept axial fan to the high temperature environment of transformer cooling, and puts forward a variant design method to solve the problem of performance mismatch.The structural dimensions and experimental data of the existing bending-swept axial fan are obtained, and the calculation areas such as rotation area, inlet air passage and outlet duct are determined, and the calculation model is established and meshed, and the appropriate calculation method is selected.The steady numerical simulation and the prediction of the external performance of the bending-swept axial fan model are carried out.The predicted and tested total pressure-flow performance curves of the fan are compared in the same coordinate system to verify the correctness of the numerical simulation method.In order to meet the requirements of given flow rate and total pressure, the five structural schemes A / B / C / D / E of the bending-swept axial flow fan are obtained by using the modified design method, and their total pressure-flow and total pressure-efficiency / flow performance curves are predicted by the same calculation method.The B / E fan with high efficiency is selected to meet the demand of flow and pressure.The distribution characteristics of total pressure and velocity streamline on the axial and radial characteristic flow surfaces of the impeller of five kinds of fans were analyzed, and the superiority of the selected fan was further verified. The performance tests were carried out on the imported test bed after the processing of the impeller of the selected fan.Verify that the selected fan can meet the flow and pressure requirements.Based on the steady flow field, the unsteady calculation and aerodynamic noise prediction of the selected B / E fan are carried out by using the improved equation of large eddy simulation (les) and Lighthill acoustic analogy (FW-H acoustic model).The predicted and experimental values of sound pressure level at point D of far field noise are compared.The eddy current noise spectrum characteristics of B / E fan with impeller surface as the noise source are analyzed. The vortex distribution characteristics in the three-dimensional unsteady flow field of the fan are studied, and the distribution law of sound pressure level in the fan rotating region is discussed.It is proved that the E fan satisfies the given noise requirement.The time-domain and frequency-domain characteristics of aerodynamic noise at different positions in the rotating region of E fan at different rotational speeds are further discussed.Finally, combined with the summary and deficiency of this paper, the research direction of aerodynamic noise of bending-swept axial fan is put forward.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH432.1

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