本文選題：離心風(fēng)機蝸殼 + 參數(shù)優(yōu)化��； 參考：《沈陽工業(yè)大學(xué)》2014年碩士論文

【摘要】：為解決通信基站內(nèi)電子設(shè)備發(fā)熱大問題，通常不間斷地使用空調(diào)降溫，新風(fēng)節(jié)能系統(tǒng)可以引進室外新鮮冷空氣降溫，減少空調(diào)運行時間達(dá)到降低能耗效果。離心風(fēng)機是新風(fēng)節(jié)能系統(tǒng)中進風(fēng)的主要動力組件，為了提高風(fēng)機的性能，對離心風(fēng)機進行了三維流場仿真及氣動噪聲的預(yù)測，針對離心風(fēng)機蝸殼的效率及結(jié)構(gòu)進行了優(yōu)化。 在對離心風(fēng)機蝸殼整體設(shè)計的基礎(chǔ)上，根據(jù)已有的葉輪，結(jié)合工業(yè)風(fēng)機和空調(diào)風(fēng)機蝸殼的技術(shù)要求進行參數(shù)計算，考慮蝸舌對風(fēng)機效率的影響，以蝸舌的半徑及蝸舌間隙為參數(shù)，通過參數(shù)化建模得到多組不同的模型。利用了FLUENT數(shù)值模擬軟件對離心風(fēng)機的內(nèi)部三維流場進行了數(shù)值計算，，并對其進行了分析。計算了多組模型離心風(fēng)機的平均增長率，最終選擇蝸舌半徑系數(shù)0.04，間隙系數(shù)0.055為最優(yōu)模型，比初始風(fēng)機的效率增長了1.268%。 對離心風(fēng)機氣動噪聲進行預(yù)測，經(jīng)過計算流體力學(xué)(CFD)計算，得到蝸殼表面的偶極子聲源，根據(jù)FW-H方程的求解，模擬了離心風(fēng)機在產(chǎn)生的氣動噪聲，得到入口及出口處監(jiān)測點的聲壓級，并通過實驗測試進行了驗證。蝸殼中蝸舌處的氣動噪聲為主要聲源，其參數(shù)的改變對風(fēng)機的噪聲具有一定的影響。 由于蝸殼材料使用EPS泡沫板，在大流量下氣體的沖擊可能導(dǎo)致的蝸型改變甚至疲勞破壞，產(chǎn)生的蝸殼振動還會使蝸殼效率降低、流量下降。為了使風(fēng)機更加平穩(wěn)運行，降低蝸殼振動，需要對離心風(fēng)機蝸殼的整體結(jié)構(gòu)進行優(yōu)化。使用ANSYSWorkbench協(xié)同仿真平臺，進行了考慮內(nèi)部流場和蝸殼振動相互作用的雙向流固耦合數(shù)值計算，模擬了離心風(fēng)機蝸殼在受到風(fēng)機氣流非定常壓力下的動力響應(yīng)。在蝸殼的初始設(shè)計模型的前蓋面使用加強筋加固，加厚蝸舌部分。結(jié)果表明，優(yōu)化后的蝸殼總變形和等效應(yīng)力都有明顯的減少，解決了蝸殼在蝸舌處的應(yīng)力集中現(xiàn)象，同時有效地改善了風(fēng)機前蓋面和出口處的振動。
[Abstract]:In order to solve the heat problem of electronic equipment in communication base station, air conditioning is usually used uninterruptedly. The fresh air energy saving system can introduce outdoor fresh cold air to cool down, reduce the operating time of air conditioning and reduce energy consumption. Centrifugal fan is the main power component of inlet air in the fresh air energy saving system. In order to improve the performance of the fan, the three-dimensional flow field simulation and aerodynamic noise prediction of the centrifugal fan are carried out, and the efficiency and structure of the spiral case of the centrifugal fan are optimized. On the basis of the whole design of centrifugal fan volute, according to the existing impeller, combined with the technical requirements of industrial fan and air conditioner fan volute, the effect of cochlear tongue on fan efficiency is considered. Taking the radius of cochlear tongue and the gap of cochlear tongue as parameters, many different models were obtained by parameterized modeling. The three-dimensional flow field of centrifugal fan is numerically calculated and analyzed by using FLUENT software. The average growth rate of multi-group centrifugal fan is calculated. Finally, the cochlea radius coefficient 0.04 and the clearance coefficient 0.055 are selected as the optimal model, which increases the efficiency of the initial fan by 1.268%. The aerodynamic noise of centrifugal fan is predicted, and the dipole sound source on the surface of volute is obtained by computational fluid dynamics (CFD) calculation. According to the solution of FW-H equation, the aerodynamic noise produced by centrifugal fan is simulated. The sound pressure levels at the inlet and outlet monitoring points were obtained and verified by experimental tests. The aerodynamic noise of the cochlea tongue in the volute is the main sound source, and the change of its parameters has a certain effect on the noise of the fan. Because the EPS foam plate is used in the volute material, the cochlea shape may change or even fatigue damage can be caused by the gas shock under the large flow rate, and the volute vibration will also reduce the volute efficiency and the flow rate. In order to make the fan run more smoothly and reduce the vibration of the volute, it is necessary to optimize the whole structure of the volute of centrifugal fan. In this paper, a bidirectional fluid-solid coupling numerical calculation considering the interaction between internal flow field and volute vibration is carried out on the ANSYSWorkbench platform. The dynamic response of centrifugal fan volute under unsteady pressure is simulated. The front cover of the initial design model of the volute is strengthened with stiffeners, and the tongue part is thickened. The results show that the total deformation and equivalent stress of the optimized volute are obviously reduced, the stress concentration phenomenon of the volute in the cochlea tongue is solved, and the vibration of the front cover and outlet of the fan is effectively improved.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TH432

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