弯型截止阀流场的PIV显示和数值模拟

Numerical simulation and flow field display by the PIV of curved cut-off valve

为了解弯型进口截止阀的流场特性,用粒子成像流速仪(PIV)对弯型截止阀对称面模型进行了流场显示;此外,采用了RNGk ε紊流模型和贴体坐标对弯型进口和斜进口截止阀对称面流场进行了模拟。通过用粒子成像流速仪流场显示技术和数值计算,揭示了弯型进口和斜进口截止阀流场特性,数值计算的流态与实验结果也较为吻合。计算结果显示斜进口截止阀流态好于弯型进口截止阀的流态。

A Particle Image Velocimetry is used to display the flow field of curved inlet cutoff valve in this paper.Meanwhile, the RNG kε turbulence model is applied to simulate the turbulent flows in the symmetrical planes of curved and inclined inlet cutoff valves.The control equations are solved in a bodyfitted corrdinate by finite volume method with a staggered grid system.The computed results of curved inlet cutoff valve are well in agreement with the experimental data, show that of curved inlet cutoff valve.The calculation results also show that the RNG kε turbulence model can be used to simulate the separated turbulent flows with eddies.