本文選題：整體葉輪　切入點(diǎn)：分流葉片　出處：《南京航空航天大學(xué)》2012年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：葉輪機(jī)械作為主要部件廣泛應(yīng)用在航空航天航海、地面推進(jìn)系統(tǒng)、能源動(dòng)力、石油化工等行業(yè)。帶分流葉片整體葉輪在工作狀態(tài)下內(nèi)部流動(dòng)特性復(fù)雜，強(qiáng)度和振動(dòng)問(wèn)題是導(dǎo)致故障的主要原因。本文實(shí)現(xiàn)了一種帶分流葉片整體葉輪的實(shí)體模型重建，分析了該重建葉輪的氣動(dòng)特性、強(qiáng)度和振動(dòng)模態(tài)以及單向流固耦合場(chǎng)對(duì)強(qiáng)度和模態(tài)的影響。論文的主要工作內(nèi)容和取得的成果如下： 1、利用Imageware及UG軟件，采用基于特征提取的重建方法，實(shí)現(xiàn)了一種帶分流葉片葉輪的實(shí)體模型重建，并給出了具體的重建方案。 2、利用ANSYS Workbench及自帶的CFX軟件分析了重建葉輪的氣動(dòng)特性，繪制了葉輪流量特性曲線。結(jié)果表明重建葉輪的流場(chǎng)分布均勻、從進(jìn)口到出口處壓力增加均勻，在設(shè)定轉(zhuǎn)速及背壓下葉輪壓比高、效率高，葉輪設(shè)計(jì)優(yōu)良。當(dāng)葉輪轉(zhuǎn)速較高時(shí)，葉輪尾緣處出現(xiàn)一定程度的回流和漩渦。 3、使用ANSYS Workbench軟件分析了葉輪的強(qiáng)度及模態(tài)。分析給出了葉輪的最高安全轉(zhuǎn)速，低周疲勞臨界轉(zhuǎn)速及臨界轉(zhuǎn)速。結(jié)果表明重構(gòu)葉輪最大應(yīng)力出現(xiàn)在葉輪下端面靠近中心孔的輪轂處，葉片上最大應(yīng)力集中在葉片前緣靠近葉根處。葉片前緣靠近葉尖處振動(dòng)時(shí)振幅最大，發(fā)生局部共振的可能性最大，在非定常氣動(dòng)力載荷以及其它激振力的長(zhǎng)期作用下，葉片前緣處容易形成高周疲勞斷裂。 4、運(yùn)用ANSYS Workbench軟件分析了葉輪在流固耦合場(chǎng)下的強(qiáng)度及模態(tài)。分析結(jié)果表明氣動(dòng)力對(duì)葉輪的強(qiáng)度有一定影響，氣動(dòng)力導(dǎo)致葉輪的應(yīng)力增大，然而葉輪的變形有微小的減少；同時(shí)，流固耦合場(chǎng)對(duì)葉輪模態(tài)影響不大，可以忽略。
[Abstract]:Impeller machinery is widely used in aerospace navigation, ground propulsion system, energy power, petrochemical industry and so on. The strength and vibration problems are the main causes of the failure. In this paper, a solid model reconstruction of the integral impeller with shunt blade is realized, and the aerodynamic characteristics of the reconstructed impeller are analyzed. The influence of strength and vibration mode and unidirectional fluid-solid coupling field on strength and mode. 1. By using the software of Imageware and UG, a reconstruction method based on feature extraction is used to reconstruct the solid model of impeller with shunt blade, and the concrete reconstruction scheme is given. 2. The aerodynamic characteristics of the reconstructed impeller are analyzed by using ANSYS Workbench and CFX software. The flow characteristic curve of the reconstructed impeller is drawn. The results show that the flow field of the reconstructed impeller is uniform, and the pressure increases uniformly from the inlet to the outlet. The impeller pressure ratio is high, the efficiency is high and the impeller design is good under the fixed speed and back pressure. When the impeller speed is high, there is a certain degree of backflow and swirl at the tail edge of the impeller. 3. The strength and mode of impeller are analyzed by ANSYS Workbench software, and the maximum safe rotational speed of impeller is given. The results show that the maximum stress of the reconstructed impeller occurs at the hub near the center hole on the bottom end of the impeller. The maximum stress on the blade is concentrated at the front edge of the blade near the root of the blade. The amplitude of the front edge of the blade near the tip of the blade is the largest, and the possibility of local resonance is the greatest. Under the long-term action of unsteady aerodynamic load and other exciting forces, It is easy to form high cycle fatigue fracture at the leading edge of blade. 4. The strength and mode of impeller under fluid-solid coupling field are analyzed by ANSYS Workbench software. The results show that aerodynamic force has certain influence on the strength of impeller, aerodynamic force causes the stress of impeller to increase, but the deformation of impeller decreases slightly. The fluid-solid coupling field has little effect on impeller modes and can be neglected.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：TH136;TP391.72

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