本文關鍵詞： 離心風機 氣動性能 降噪 加熱管 換熱性能　出處：《合肥工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：為克服狹長復雜風道的阻力,洗烘一體機的烘干系統(tǒng)采用大壓頭的離心風機進行氣流驅動;為增強傳熱效果,采用高功率的加熱管束進行加熱。但逼仄狹小的烘干風道極大制約了離心風機的氣動性能,加之風道輪廓的不合理,大大增強了離心風機的氣動噪聲;而光滑的加熱管束雖然產生的流動阻力較小,但同樣造成加熱管傳熱性能的削弱。為了合理匹配離心風機的流場和加熱管的傳熱特性,增強風機氣動性能,降低風機氣動噪聲,提高加熱管傳熱性能,本文以滾筒洗衣機的烘干系統(tǒng)為研究對象,對離心風機的流場及噪聲特性和加熱管束的傳熱特性進行了相關研究。首先,采用數值模擬方法,通過FLUENT軟件對滾筒洗衣機烘干風道內離心風機的運行工況進行模擬,獲取了風機的流場信息;其次,通過分析風機流場信息得知制約風機氣動性能的因素是蝸殼、蝸舌及流道輪廓,分別對其進行優(yōu)化設計,并結合氣動噪聲理論對噪聲進行研究;之后,針對氣動性能和氣動噪聲的研究結果,提出風機和流道的綜合設計,發(fā)現改進模型相比原型風機全壓提升23.05%,效率提升20.11%,總噪聲值下降了3.61 dB(A);最后,采用數值模擬方法研究了改進模型下加熱管束的直徑、行距列距、排布方式、截面形狀和表面形狀對其傳熱特性的影響,發(fā)現在產生較小流動阻力的前提下,僅在改變加熱管的截面形狀和表面形狀時,其傳熱性能相對原型得以提高。另外,為證明改進模型的風機氣動性能和氣動噪聲相對原型具有較優(yōu)的設計效果,制作原型和改進模型的烘干風道,并配合離心風機進行裝配。分別測試二者全工況下的風機性能曲線,發(fā)現改進模型下的離心風機的全壓及效率曲線遠遠優(yōu)于原型。分別將原型和改進模型裝配到滾筒洗衣機烘干系統(tǒng)內,并在半消聲室內進行洗衣機烘干工況的氣動噪聲測試,發(fā)現改進模型的整機噪聲相對原型降低了2.54 dB(A)。實驗結果證明了數值模擬方法的可靠準確。
[Abstract]:In order to overcome the drag of narrow and complicated air duct, the drying system of the integrated washing and drying machine is driven by centrifugal blower with large pressure head, in order to enhance the effect of heat transfer, The high power heating tube bundle is used to heat the centrifugal fan, but the narrow and narrow drying air duct greatly restricts the aerodynamic performance of the centrifugal fan, and the air duct profile is unreasonable, which greatly enhances the aerodynamic noise of the centrifugal fan. The smooth heating tube bundle, although the flow resistance is small, also results in the weakening of the heat transfer performance of the heating pipe. In order to reasonably match the flow field of the centrifugal fan and the heat transfer characteristics of the heating pipe, enhance the aerodynamic performance of the fan and reduce the aerodynamic noise of the fan, In order to improve the heat transfer performance of heating pipe, the flow field and noise characteristics of centrifugal fan and the heat transfer characteristic of heating tube bundle are studied in this paper, taking the drying system of drum washing machine as the research object. Firstly, the numerical simulation method is used. The flow field information of the fan is obtained by simulating the operating condition of the centrifugal fan in the dryer duct of the drum washing machine by using FLUENT software. Secondly, through analyzing the flow field information of the fan, the author finds out that the factor restricting the fan's aerodynamic performance is the volute. The contour of cochlear tongue and channel are optimized, and the noise is studied in combination with the theory of pneumatic noise. Then, according to the research results of aerodynamic performance and aerodynamic noise, the comprehensive design of fan and channel is put forward. It is found that compared with the prototype fan, the improved model is 23.05, the efficiency is increased 20.11, the total noise value is reduced by 3.61 dB / An. Finally, the diameter, row spacing and arrangement of the heating tube bundles under the improved model are studied by numerical simulation. The influence of cross section shape and surface shape on heat transfer characteristics shows that the heat transfer performance of the heating tube can be improved by changing the cross section shape and surface shape of the heating tube only when the flow resistance is small. In order to prove that the aerodynamic performance and aerodynamic noise of the improved model have better design effect than the prototype, the prototype is made and the drying duct of the improved model is made. And combined with centrifugal fan assembly. Test the fan performance curves under both conditions, It is found that the full pressure and efficiency curve of centrifugal fan under the improved model is much better than the prototype. The prototype and the improved model are respectively assembled into the drum washing machine drying system, and the aerodynamic noise of the washing machine drying condition is tested in the semi-anechoic chamber. It is found that the whole machine noise of the improved model can be reduced by 2.54 dBU / AU relative to the prototype. The experimental results show that the numerical simulation method is reliable and accurate.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM925.33

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