Influence of dissolved gases on cavitating flow around a two-dimensional hydrofoil
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摘要:
由于工质的特殊性及极端的航空条件,溶解性气体是燃油空化中不可忽略的一个重要因素。为揭示溶解性气体对空化过程的独立作用机制,本研究以常温水为工作介质,对二维Clark Y-11.7%水翼的空化流动特性进行研究,重点关注液体水中溶解氧对流扩散作用及溶解/析出过程,深入探究溶解性气体对基础水翼空化的影响机制。在Schnerr-Sauer空化模型框架下,耦合溶解性气体对流扩散作用及溶解/析出过程,从而构建SS-DG空化模型,并以该空化模型对水翼空化进行数值仿真,结合实验结果,详细分析两种攻角(8°和20°)、3种不同浓度溶解氧条件下溶解性气体对水翼空化形态及水动力学特性的影响。结果表明:液体中不同浓度溶解氧会改变水翼前缘附近空泡形态;两种攻角下,不同浓度溶解氧对水翼升阻力系数的平均值影响较小,但会改变其非稳态特性;此外,由于大尺度流动分离现象出现,20°攻角水翼空化区内溶解氧浓度时均值显著高于相同工况下8°攻角下的溶解氧浓度。
Abstract:Due to the particularity of the working fluid and extreme aviation conditions, dissolved gases are important factors that cannot be ignored in fuel cavitation. To reveal the independent mechanism of dissolved gases in the cavitation process, the cavitating flow characteristics around a two-dimensional Clark Y-11.7% hydrofoil in room-temperature water were investigated. Particular attention was paid to the convection–diffusion behavior of dissolved oxygen in liquid water as well as the dissolution/degassing processes. Using the Clark Y-11.7% hydrofoil as the research object, an in-depth exploration of the influence mechanism of dissolved gases on the fundamental cavitation of a hydrofoil was performed. Within the framework of the Schnerr-Sauer cavitation model, the convection-diffusion effect and dissolution/degassing processes of dissolved gases were coupled to establish the SS-DG cavitation model. Numerical simulations of hydrofoil cavitation were then conducted using this model. Combined with experimental results, the effects of dissolved gases on cavitation structures and hydrodynamic characteristics were analyzed in detail under two angles of attack (8° and 20°) and three different dissolved oxygen concentrations. The results showed that different concentrations of dissolved oxygen in the liquid altered the cavity structure near the leading edge of the hydrofoil. Under both angles of attack, the average lift and drag coefficients were only slightly affected by dissolved oxygen concentration, but its presence modified the unsteady characteristics. In addition, due to large-scale flow separation, the time-averaged dissolved oxygen concentration in the cavitation region at a 20° angle of attack was significantly higher than that at 8° under the same conditions.
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Key words:
- aviation fuel pump /
- gaseous cavitation /
- dissolved gases /
- cavitation model /
- numerical analysis
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表 1 物性参数
Table 1. Physical property parameters
$ {\rho }_{\text{l}} $/(kg/m3) $ {\rho }_{\text{v}} $/(kg/m3) $ {\mu }_{\text{l}} $/10−6 (Pa·s) $ {\mu }_{\text{v}} $/10−4 (Pa·s) pv/Pa 温度/K 气体常数
Rg/(J/(kg·K))亨利常数/109 Pa 摩尔
质量比M998 0.0173 1.006 5.619 2339 293.15 287 4.4 1.78 表 2 计算条件
Table 2. Calculation conditions
攻角$ \alpha $ /
(°)入口速度/
(m/s)溶解氧
DO/%空化数$ \sigma $ pref/Pa 8 8.1 20 (lowDO) 1.05 36725 50 (midDO) 0.92 32480 80 (highDO) 1.05 36725 20 5.6 25 (lowDO) 2.08 34888 53 (midDO) 2.05 34420 76 (highDO) 2.08 34888 表 3 网格无关性检验
Table 3. Grid independence test
网格名称 网格数/104 Cl Cd y+(平均值) Mesh 1 8.2 0.882 0.165 1.8 Mesh 2 13.8 0.939 0.169 1.6 Mesh 3 34.2 0.946 0.170 1.2 Mesh 4 62.3 0.948 0.170 1.1 表 4 8°攻角下升阻力系数平均值及主频
Table 4. Average values of lift and drag coefficients and dominant frequency at an attack angle of 8°
工况 空化主频 /Hz 升力系数平均值 阻力系数平均值 实验 数值 实验 数值 实验 数值 HighDO 12.7 13.9 1.05 0.95 0.11 0.17 MidDO 12.7 10 0.97 0.89 0.11 0.13 LowDO 9.8 10 1.0 0.92 0.10 0.13 -
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