Digital gas flowmeterSimulation work focuses on 5 aspects
Digital gas flowmeterUsing computer modeling and simulation techniques combined with experimental results, quantitatively analyze the relationship between flow measurement accuracy and bend angle, Reynolds number, pipe diameter, detection position, and pipe wall roughness in the downstream straight pipe section under the action of the upstream bend of the sensor. This research method can be further extended to the structural optimization design and error analysis of other types of digital gas flow meters through the improvement of subsequent work, which will play an important role in continuously improving the design accuracy and practical engineering applications of this sensor.
Digital gas flowmeterThe measurement accuracy plays a crucial role. We usually believe that the value of K largely depends on factors such as Reynolds number, the state of the pipeline flow field, and the installation conditions of the flowmeter. This article compares experimental techniques with simulation results to demonstrate the feasibility of numerical simulation of pipelines. With the help of CFD software, it focuses on studying and analyzing the relationship between several flow field parameters that affect the flow field correction coefficient K and pipeline flow measurement errors.
The simulation work of digital gas flow meters focuses on five aspects:
1) Considering the actual installation environment of digital gas flow meters, the gas flow state is set to turbulent motion with Reynolds numbers (Re) ranging from 5000 to 20000. Study the influence of Re variation on measurement accuracy by setting the initial gas flow rate in the inlet pipeline.
2) Adjust the bending angle of the upstream bend and demonstrate the relationship between the change in bend angle and downstream measurement accuracy.
3) Change the distance from the test point to the upstream bend, the diameter of the pipeline, and analyze the impact of pipeline geometric factors on flow measurement accuracy.
4) In response to the impact of scale accumulation on the flow of digital gas flow meters in actual pipelines due to long-term use, different sizes of average pipe wall roughness are set to simulate their impact trends.
5) Based on the above simulation results, a quantitative analysis of the impact of various factors on the flow field is conducted to obtain a relative error tolerance table.
Since its introduction in the 1970s, digital gas flow meters have attracted increasing attention from the industry due to their high accuracy, good repeatability, absence of moving parts, and no pressure loss on the body. However, there are still many technical problems that are difficult to overcome in the measurement of digital gas flow meters, such as severe acoustic noise interference, large signal attenuation amplitude, and unstable signals. The existence of these problems seriously restricts the basic indicators of product measurement accuracy, stability, repeatability, etc., and hinders the development of productization.