知识与财富的链接
利用fluent软件,选取标准k-ε湍流模型,对90°圆断面弯管在雷诺数为60000时的局部损失进行了数值模拟。结果表明:标准k-ε湍流模型能较好地预测弯管内由于离心力造成的二次流,弯管内流场及压强分布与试验值吻合较好,计算得到的局部损失系数与试验值基本一致,从而验证了数值模拟方法对弯管局部损失计算的有效性。
Choosing standard k-ε turbulence model, the paper simulated the local head loss of bend with circular section at 90 degrees by use of fluent software when Re equal to 6000.The results showed that the turbulence model can better predict the second flow in the pipe caused by centrifugal force.The simulated sectional flow field and pressure distribution in the pipe all agreed well with the experiment results.The coffercient of local head loss gotten by calculation is almost consistent with the experiment data. Therefore the efficiency of the numerical simulation for local flow loss of bend was validated.
