The swirl meter is one of the gas flow meters used in the industry. Its advantages are as follows: a strong signal level, easy maintenance, and stable performance. Hence, it has become widely accepted for natural gas metering. In this study, the numerical computation of the three-dimensional unsteady flow in a swirl meter was conducted using the renormalization group k–ε turbulence model and SIMPLE algorithm. The internal flow fields were analyzed in detail, wherein the velocity and pressure distributions were discussed under six flow rates (6, 15, 25, 40, 70, and 100 m3/h) and three swirl cone angles (11°, 20°, and 30°). The obtained results are reported and discussed as follows: the stable performance of the swirl meter was due to its capacity to maintain its internal characteristics over a large flow range. Also, it was detected that though the pressure decrease was gradual on the wall, an opposite tendency was shown at the center. On the other hand, the swirler structure was crucial to the metering capacity of the swirl meter, and the swirler cone angle influenced the pressure and velocity.

中文翻译：

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不同旋流器旋流计的数值研究与特性分析

旋流计是工业上使用的气体流量计之一。其优点是：信号电平强，维护方便，性能稳定。因此，它已被广泛接受用于天然气计量。本研究采用重整化群k-ε湍流模型和SIMPLE算法对旋流计中三维非定常流动进行数值计算。详细分析了内部流场，其中讨论了在六种流速（6、15、25、40、70 和 100 m3/h）和三种涡流锥角（11°、20°、和 30°）。获得的结果报告和讨论如下：涡流计的稳定性能是由于其在大流量范围内保持其内部特性的能力。还，检测到，虽然压力在壁上逐渐下降，但在中心显示出相反的趋势。另一方面，旋流器结构对旋流计的计量能力至关重要，旋流器锥角影响压力和速度。