本文選題：空調(diào)開式軸流風(fēng)扇 + 單向流固耦合��； 參考：《華中科技大學(xué)》2015年碩士論文

【摘要】：開式軸流風(fēng)機(jī)廣泛應(yīng)用于分體式空調(diào)室外機(jī)中,其無蝸殼的結(jié)構(gòu)形式是造成風(fēng)扇在工作時(shí)其內(nèi)流場與常規(guī)軸流風(fēng)機(jī)內(nèi)流場之間存在較大差異的主要原因。因此改善開式軸流風(fēng)扇性能、提高穩(wěn)定性問題愈來愈受到科技人員的關(guān)注。開式軸流風(fēng)扇在運(yùn)轉(zhuǎn)時(shí),其葉片同時(shí)受到氣動(dòng)力、離心力和彈性力等多種力的耦合作用,而在實(shí)際工作中難以通過試驗(yàn)的方法來研究耦合場力對(duì)葉片振動(dòng)的影響。為改善空調(diào)開式軸流風(fēng)扇的振動(dòng)性能,本文基于單向流固耦合理論,通過數(shù)值模擬和試驗(yàn)相結(jié)合,對(duì)一款開式軸流風(fēng)扇的氣動(dòng)性能、結(jié)構(gòu)強(qiáng)度以及共振進(jìn)行研究,旨在為開式軸流風(fēng)扇的氣動(dòng)性能和結(jié)構(gòu)振動(dòng)的預(yù)測提供指導(dǎo)。本文完成如下工作:(1)對(duì)一款空調(diào)開式軸流風(fēng)扇開展了一系列性能試驗(yàn),研究不同轉(zhuǎn)速、不同流量工況對(duì)風(fēng)扇性能的影響。基于Fluent軟件對(duì)該開式軸流風(fēng)扇模型進(jìn)行流場建模,在參考性能試驗(yàn)條件的基礎(chǔ)上對(duì)該風(fēng)扇模型進(jìn)行氣動(dòng)性能的預(yù)測,并將性能預(yù)測結(jié)果與試驗(yàn)結(jié)果進(jìn)行對(duì)比,驗(yàn)證了流場數(shù)值模擬方法的可靠性。(2)以ANSYS Workbench為平臺(tái),采用單向流固耦合計(jì)算方法,將在流場中得到的開式軸流風(fēng)扇葉片表面的氣動(dòng)力施加到結(jié)構(gòu)模型上,并加載旋轉(zhuǎn)約束,得到了風(fēng)扇葉片在不同工況下的應(yīng)力分布和結(jié)構(gòu)變形,并與非流固耦合工況下葉片的應(yīng)力分布和結(jié)構(gòu)變形進(jìn)行了對(duì)比。結(jié)果表明,葉片最大變形量位于葉尖部位,最大應(yīng)力位于葉根前緣吸力面?zhèn)?并且葉片的安全系數(shù)遠(yuǎn)遠(yuǎn)大于材料的許用安全系數(shù)。(3)基于BruelKjaer-Pulse分析平臺(tái)得到開式軸流風(fēng)扇葉片自由狀態(tài)下的模態(tài)頻率,與基于Modal模塊得到的計(jì)算模態(tài)頻率進(jìn)行對(duì)比,驗(yàn)證了該模態(tài)計(jì)算方法的可靠性;分別對(duì)空調(diào)開式軸流風(fēng)扇進(jìn)行非流固耦合模態(tài)和流固耦合模態(tài)的計(jì)算,并將上述三種模態(tài)下葉片的各階固有頻率和模態(tài)振型進(jìn)行對(duì)比。結(jié)果表明離心力和流場氣動(dòng)力都不同程度的增加了風(fēng)扇葉片的模態(tài)頻率。對(duì)流固耦合狀態(tài)下葉片的共振特性分析表明該開式軸流風(fēng)扇的設(shè)計(jì)有效地避開了共振。該單向流固耦合研究為空調(diào)開式軸流風(fēng)扇的氣彈穩(wěn)定性預(yù)測提供經(jīng)驗(yàn)和指導(dǎo)。
[Abstract]:The open type axial fan is widely used in the outdoor air conditioners of the split type air conditioner. The main reason for the difference between the inner flow field of the fan and the flow field in the conventional axial flow fan is the main cause of the difference between the inner flow field of the fan and the flow field in the conventional axial flow fan. Therefore, the problem of improving the performance of the open axial fan and improving the stability is getting more and more attention of the scientific and technical personnel. During the operation of an axial fan, the blade is coupled with a variety of forces, such as aerodynamic force, centrifugal force and elastic force, and it is difficult to study the effect of coupling field force on blade vibration in practical work. In order to improve the vibration performance of an open axial flow fan, this paper is based on the unidirectional fluid solid coupling theory and through the numerical value. The aerodynamic performance, structural strength and resonance of an open axial fan are studied by the combination of simulation and experiment. The purpose is to provide guidance for the aerodynamic performance and structural vibration prediction of open axial fan. The following work is completed in this paper: (1) a series of performance tests are carried out on an open axial fan with air conditioning, and the different rotational speeds are studied. The effect of the same flow condition on the performance of the fan. Based on the Fluent software, the model of the open axial flow fan is modeled. On the basis of the reference performance test conditions, the aerodynamic performance of the fan model is predicted, and the performance prediction results are compared with the test results, and the reliability of the numerical simulation method is verified. (2) ANS On the platform of YS Workbench, the aerodynamic force of an open axial fan blade on the flow field is applied to the structure model, and the rotation constraint is loaded. The stress distribution and structural deformation of the fan blade under different working conditions are obtained, and the stress distribution and the junction of the blade under the non fluid solid coupling condition are obtained. The results show that the maximum deformation of the blade is located at the tip of the blade, and the maximum stress is located on the side of the suction surface of the front of the blade, and the safety factor of the blade is far greater than the allowable safety factor of the material. (3) based on the BruelKjaer-Pulse analysis platform, the modal frequency of the free state of the open axial fan blade is obtained, and it is based on the Moda. The calculated modal frequency of the L module is compared, and the reliability of the modal calculation method is verified. The non fluid solid coupling mode and the fluid solid coupling mode of the open axial flow fan are calculated respectively, and the natural frequencies of the blades are compared with the modal modes in the three modes. The results show that the centrifugal force and the flow field are aerodynamic. The modal frequency of the fan blade is increased in varying degrees. The analysis of the resonance characteristics of the blade in the convective solid coupling state shows that the design of the open axial fan effectively avoids the resonance. The unidirectional fluid solid coupling study provides experience and guidance for the aeroelastic stability prediction of the open axial flow fan in the air conditioning.

【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】：2015
【分類號(hào)】：TU83

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