径向直叶片燃油汽心泵汽心形态数值模拟

为获得燃油汽心泵内气态区域的形成过程及形态的变化规律,基于renormalization group(RNG) k-ε双方程湍流模型与Schnerr-Sauer空化相变模型,对径向直叶片燃油汽心泵进行了整体三维建模与气液两相定常数值模拟,分析转速、进口节流活门开度、出口压力等因素对燃油汽心泵内气态区域的影响.结果表明:一定转速范围内气态区域随转速增加而扩大;转速不变时出口压力增加会使气态区域范围减小;气态区域扩张至极限位置即叶轮直径外,燃油汽心泵进入不稳定工况.RNG k-ε双方程湍流模型和与Schnerr-Sauer空化相变模型适用于燃油汽心泵汽心形态的数值模拟. 

Numerical simulation on fuel vapor core configuration in fuel vapor core pump with radial straight blades

To obtain the establishment process and change rule of vapor core in the fuel vapor core pump, based on renormalization group (RNG) k-ε double-equation turbulence model and Schnerr-Sauer cavitation phase transition model, a fuel vapor core pump with radial straight blades was studied by overall three-dimensional geometry modeling and steady vapor-liquid two-phase numerical simulation. And the vapor phase region under the influences of rotation speed, throttle opening and outlet pressure was further analyzed. Results show that, the vapor core enlarges with the increasing rotation speed within a certain range of rotation speed, while the vapor core lessens as the outlet pressure increases at a constant rotation speed. When the vapor phase region expands to the limit position, namely passing through the impeller outlet, the vapor core pump runs under the unstable condition. Both RNG k-ε double-equation turbulence model and Schnerr-Sauer cavitation phase transition models can be applied to numerical simulation on vapor core configuration in the fuel vapor core pump.