V-cone flowmeter deviation from standard parameter effects

The V-cone flowmeter's outflow coefficient is related to the diameter ratio β and the Reynolds number Red, and it is sometimes difficult to ensure that the site parameters are always within the standard range. Therefore, when these parameters deviate from the phenomenon, additional uncertainties will occur. The following gives us the main ways to introduce the influence of the deviation of the V-cone flowmeter from the standard parameters:

1, β value of the first to introduce the meaning of the next beta value, in fact, we may have a bit more or less understanding of the beta, is the ratio of the throttle diameter and the pipe diameter, after all, V cone flowmeter is a ring hole The board is derived from a combination of classic venturi tubes. Therefore, the V-cone also combines their advantages. It can measure dirty media with low pressure loss. According to the classic Venturi theory, the actual β should be controlled within 0.75. When the value of β is not more than 0.75 due to improper design, the dispersion coefficient of the outflow coefficient is large, and the uncertainty of the outflow coefficient is more than doubled.

2, the impact of Reynolds number V cone flowmeter due to its special structure, compared to the standard throttling device, the Reynolds number lower limit has been greatly improved, but it is not very limited. When the Reynolds number goes down without limit, the outflow coefficient of the V-cone flowmeter decreases as the Reynolds number decreases, and the uncertainty increases.

V-cone flowmeter is a new type of differential pressure flow meter. In recent years, the usage has been increasing year by year. It has the tendency to replace the standard throttling device, but it is still limited in high pressure applications, because in the case of high pressure, the cone The structure of the negative pressure tube will fall off when subjected to high pressure, so our production companies cannot blindly produce and must observe field parameters.