Turbine meters are used in compressed natural gas (CNG) stations in abundance to measure the volumetric flow rate of the inlet gas. These types of meters are very sensitive to oscillating and pulsating flows. When the station’s reciprocating compressor starts to work, due to the piston and valve performance, pulsating flow will create in the suction line and downstream of turbine meter. This pulsation makes false pulses in the meter and finally makes difference between the measured gas flow from the metering of the gas company and the amount of gas that has been sold at the station. In this study, numerical simulation of dampeners has been investigated after turbine meter and before entering gas to compressor. The goal is eliminating or reducing the effects of operating compressor in CNG station on turbine meter and reducing measurement errors. Numerical simulation of dampener was investigated by Ansys-Fluent CFD software for a CNG station with the gas inlet pressure 250 psi, inlet and outlet pipe diameter of 2 inches. In this study, several parameters such as (1) height-to-diameter ratio in the cylinder, (2) distance between dampener and compressor, and (3) volume-to-minimum volume ratio according to API 618, have been checked. The numerical results show that by increasing height-to-diameter ratio up to 3, the pulsating amplitude on Plane 1 will be reduced, and this is the best ratio according to the present results. Also, by increasing the outlet pipe length, the pressure pulsation amplitude decreases from 3.4% of pressure line in 2 m length to 0.7% in 5 m length. Moreover, the results showed 2.4% increase and 1.9% decrease in the maximum and minimum pressure for CV = 1 and CV = 16.7, respectively. Comparing fluent numerical method with previous studies shows less than 2% difference that demonstrates the validity and reliability of present investigation.

中文翻译：

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在脉动 CNG 吸入管线中分析圆柱阻尼器对涡轮流量计精度的影响：通过 CFD 模拟进行的优化设计

涡轮流量计大量用于压缩天然气 (CNG) 站，以测量入口气体的体积流量。这些类型的仪表对振荡和脉动流非常敏感。当该站的往复式压缩机开始工作时，由于活塞和阀门的性能，在吸入管路和涡轮流量计的下游会产生脉动流。这种脉动会在仪表中产生错误的脉冲，并最终使燃气公司计量的测量气体流量与加油站已售出的燃气量之间产生差异。在这项研究中，阻尼器的数值模拟已经在涡轮流量计之后和气体进入压缩机之前进行了研究。目标是消除或减少运行压缩天然气站的压缩机对涡轮流量计的影响并减少测量误差。通过 Ansys-Fluent CFD 软件对进气压力为 250 psi、进出口管径为 2 英寸的 CNG 站进行阻尼器的数值模拟。在这项研究中，根据 API 618，检查了几个参数，例如 (1) 气缸中的高度直径比，(2) 阻尼器和压缩机之间的距离，以及 (3) 体积与最小体积比。数值结果表明，通过将高径比增加到 3，平面 1 上的脉动幅度将减小，这是目前结果的最佳比率。此外，通过增加出口管长度，压力脉动幅度从 2 m 长度的压力线的 3.4% 降低到 5 m 长度的 0.7%。此外，结果显示，对于 CV = 1 和 CV = 16.7，最大和最小压力分别增加 2.4% 和 1.9%，分别。将流利的数值方法与以前的研究进行比较表明，差异小于 2%，这证明了当前调查的有效性和可靠性。