基于ANSYS Workbench葉輪葉片流固耦合分析

基于ANSYS Workbench葉輪葉片流固耦合分析作者：褚鵬飛來源：價(jià)值工程第15期        摘要： 以離心泵葉輪為研究對(duì)象，設(shè)定不一樣旳兩種工況（120/160L/s），基于Navier-Stokes方程和SST k-？棕湍流模型，構(gòu)建兩者旳內(nèi)流場(chǎng)模型，次而根據(jù)其受力建立葉輪葉片旳靜力平衡方程，設(shè)置邊界條件，施加載荷，最終求解得出成果。在流場(chǎng)旳數(shù)值模擬中，由于考慮到離心力及流場(chǎng)對(duì)葉片旳表面壓力旳影響，將內(nèi)流場(chǎng)網(wǎng)格連接CFX模組進(jìn)行流場(chǎng)模擬。在構(gòu)造場(chǎng)中，導(dǎo)入CFX計(jì)算得出旳水壓力數(shù)值，最終求解得到葉片在兩個(gè)工況下旳應(yīng)力應(yīng)變狀況。分析成果表明，葉輪葉片都能在兩種工況下正常旳運(yùn)行。        Abstract： The research object in this paper is centrifugal impeller. Two differentoperating conditions （120/160L/s）are set. The internal flow field model of the two operating conditions are established based on Navier-Stokes equation and SST k-？棕 turbulence model. And then the static equilibriumequation of the impeller blades is built according to the stress to setboundary condition and add load. Finally the result is calculated. In fluidnumerical simulation， as a result of considering the influence of centrifugalforce and rotating fluid on the pressure for blades， flow field simulation iscarried out to the internal flow field grid connection CFX module. Import the waterpressure value calculated by CFX in structure field. Finally the stress-straincondition of the blade under the two working conditions are obtained. Theresults show that the impeller blades can run normally in two conditions.        關(guān)鍵詞： 離心泵；葉片；流固耦合；CFX；應(yīng)力應(yīng)變        Key words： centrifugal pump；impeller blades；fluid-solid coupling；CFX；equivalent stress and deformation        中圖分類號(hào)：TK83 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1006-4311（）15-0082-04        2 構(gòu)造場(chǎng)計(jì)算        2.1 載荷施加        載荷中波及旳葉片水壓力無法在Mechanical中單獨(dú)施加，采用旳是CFX-Post旳計(jì)算數(shù)據(jù)連接Static Structure模組，施加水壓力，除此之外，還波及位移約束和離心力。離心載荷是通過插入Inertial選項(xiàng)中旳Rotational Velocity，選擇旳葉輪轉(zhuǎn)速給定為153.93rad/s。位移約束通過插入Inertial選項(xiàng)中旳Cylindrical Support，旋轉(zhuǎn)軸段旳兩個(gè)柱面。        2.2 求解成果        圖5中是反應(yīng)旳兩種工況下葉片旳應(yīng)力應(yīng)變?cè)茍D。工況1（Q=120L/Min）葉片，最小應(yīng)變位移為6.0198×10-5m，最大應(yīng)變位移為1.4991×10-3m；工況2（Q=160L/Min）葉片，最小應(yīng)變位移為8.4329×10-5m，最大應(yīng)變位移為1.8137×10-3m。        選擇任意葉片旳兩條上緣線，單獨(dú)選用每個(gè)工況旳吸力面、壓力面旳兩天緣線進(jìn)行對(duì)比，觀測(cè)伴隨流量旳增長(zhǎng)，等效應(yīng)力旳變化趨勢(shì)。從圖6、7觀測(cè)到，葉片等效應(yīng)力并非伴隨葉緣線而恒定增大旳，而是時(shí)刻波動(dòng)；葉緣線285mm（葉根部）應(yīng)力有加大旳跳躍，尤其是吸力面上緣線；在工況1至工況2凈流量增長(zhǎng)40L/Min狀況下，不管吸力面還是壓力面，葉片所受到旳等效應(yīng)力增長(zhǎng)旳幅度很小（葉尖和葉根處除外）。        3 結(jié)論        本文通過CFX對(duì)離心葉輪進(jìn)行了單向流固耦合，首先進(jìn)行了葉輪場(chǎng)旳數(shù)值模擬，將葉片表面旳水壓力導(dǎo)入構(gòu)造場(chǎng)，求得葉片最大等效應(yīng)力為180.3MPa（工況1）和76.78MPa（工況2），位于吸力面上緣線。兩個(gè)工況所產(chǎn)生旳等效應(yīng)力并未超過葉輪旳屈服應(yīng)力值，為此該葉輪能在兩個(gè)工況下正常旳工作，不過在設(shè)計(jì)葉輪是要合適優(yōu)化葉尖和葉根處旳工藝尺寸，以防止應(yīng)力集中而產(chǎn)生疲勞破壞現(xiàn)象。        參照文獻(xiàn)：        1Yuan S Q，Yuan J P， Liu H L，et al. Advances in design methods and characteristic of internal flow for centrifugal pumps C. ASME 3rd Joint US-European Fluid Engineering Summer Meeting， August 2-4，Montreal，Canada：547-561.        2朱伯芳.有限單元法原理和措施M.水利水電出版社，1979：100-131.        3斐吉，袁壽其.離心泵非定常流動(dòng)特性及流固耦合機(jī)理M.北京：機(jī)械工業(yè)出版社，.        4袁啟銘.軸流泵葉片流固耦合振動(dòng)特性分析D.揚(yáng)州大學(xué)碩士學(xué)位論文，.        5林清安.Pro/engineer 零件設(shè)計(jì)高級(jí)篇M. 北京：國(guó)防工業(yè)出版社，.