【摘要】：采用試驗與數(shù)值模擬相結(jié)合的方法,對不同材質(zhì)水翼的空化水彈性響應(yīng)及其振動特性進行了分析.試驗中,采用高速攝像技術(shù)觀測不同空化階段的空穴形態(tài),應(yīng)用多普勒激光測振儀測量水翼的振動速度.采用k-ωSST湍流模型和Zwart空化模型對流場進行數(shù)值模擬,并建立兩自由度結(jié)構(gòu)模型,基于混合耦合算法實現(xiàn)流固耦合數(shù)值模擬計算.試驗結(jié)果表明,水翼的振動幅度在云狀空化階段達到最大,水翼的振動主頻與空泡脫落頻率一致,并隨空化數(shù)減小而降低.數(shù)值預(yù)測結(jié)果與試驗結(jié)果吻合較好,能較準(zhǔn)確地捕捉附著型空穴的生長、脈動以及云狀空穴的斷裂脫落過程,主要振動頻率與相應(yīng)空泡脫落頻率一致.受水翼彈性變形和結(jié)構(gòu)水彈性響應(yīng)的影響,彈性材料水翼吸力面的空泡發(fā)展更為復(fù)雜,空泡脫落過程伴隨著大尺度空泡團的二次附著與脫落,且空泡團容易發(fā)生破碎,形成水氣混合狀,其結(jié)構(gòu)振動特性和流激振動頻譜成分也更加復(fù)雜.
[Abstract]:The cavitation hydroelastic response and vibration characteristics of hydrofoil with different materials are analyzed by means of experiment and numerical simulation. In the experiment, high-speed camera technology was used to observe the shape of holes in different cavitation stages, and Doppler laser vibrometer was used to measure the vibration velocity of hydrofoil. The k-蠅-SST turbulence model and the Zwart cavitation model are used to simulate the flow field, and the two-degree-of-freedom structure model is established. The fluid-solid coupling numerical simulation is realized based on the hybrid coupling algorithm. The experimental results show that the vibration amplitude of the hydrofoil reaches its maximum in the cloud cavitation stage. The main vibration frequency of the hydrofoil is consistent with that of the cavitation shedding frequency, and decreases with the decrease of the cavitation number. The numerical prediction results are in good agreement with the experimental results, and can accurately capture the growth, pulsation and fracture and shedding processes of the attached holes, and the main vibration frequencies are consistent with the corresponding cavitation shedding frequencies. Influenced by the elastic deformation of hydrofoil and the hydroelastic response of the structure, the development of cavitation on the suction surface of hydrofoil is more complicated. The process of cavitation shedding is accompanied by the secondary attachment and shedding of large-scale bubble clusters, and the cavitation clusters are prone to fragmentation. The structure vibration characteristics and flow-induced vibration spectrum components are more complex because of the formation of water-gas mixture.
【作者單位】： 北京理工大學(xué)機械與車輛學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51306020) 四川大學(xué)水力學(xué)與山區(qū)河流開發(fā)保護國家重點實驗室開放課題
【分類號】：O35
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本文編號：2455776