【摘要】 利用RNGk-ε模型,对100mm口径锥体差压式流量传感器进行了CFD数值模拟实验,其等效直径比β值分别为0.50、0.65、0.85,前锥角分别为40°、45°、50°,后锥角分别为120°、130°、140°,共27种锥体组合.实验结果表明:β值越大,流出系数越小,且流出系数更易受雷诺数的影响;β值相同时,前锥角对流出系数具有较大影响,且较大的前锥角可减弱雷诺数对流出系数的影响;后锥角对流出系数的线性度具有一定程度的影响.数值模拟实验于实流物理实验结果相比,平均误差约5%,最大值小于9.1%.更多还原

【Abstract】 Computational fluid dynamics (CFD) numerical simulation tests for cone differential flowsensors with diameter of 100 mm are carried out here, which RNG k-ε turbulence model is used and the values of equivalent diameter ratio, viz. β, are 0.50, 0.65, 0.85 respectively, the fore Cone angle, 40°, 45°, 50° respectively, the aft V-Cone angle, 120°, 130°, 140° respectively. The simulation results show that the discharge coefficient increases while the β is decreased, and it is influenced more easily by Reynolds number while the β is increased. Secondly, if the β keeps the same value, the fore Cone angle is crucial, and the aft can influence the linearity at a certain extent. Thirdly, larger fore Cone angle will weaken the influence of the Reynolds number. Comparison with real physical tests, the averaged deviation of simulations is approximate 5%, the maximum, less than 9.1%.更多还原