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What are the differences between vortex flowmeter and orifice flowmeter when measuring steam?
There are many differences between vortex flowmeter and orifice flowmeter when measuring steam, as follows: In terms of accuracy, orifice flowmeter: strictly calculate the flow rate according to the national standard calculation formula. For scenarios with strict requirements, such as heating stations, using orifice flowmeter can better meet the accuracy requirements.. Vortex flowmeter: using a simplified calculation formula to calculate flow rate, the accuracy is slightly inferior to that of orifice flowmeter. In terms of accuracy changes: Orifice flowmeter: The inner diameter is small, and the obtuse angle of the inner wall may change after prolonged use, or dust and pollutants may increase the wall thickness, affecting the calculation formula and directly affecting the accuracy. Vortex flowmeter: Over time, there may be occasional drift in accuracy and linearity, but it can be restored through recalibration. In terms of universality: Orifice flowmeter: It requires setting multiple parameters such as pipe diameter, wall thickness, material, Reynolds coefficient, etc., which have high professional requirements and are not very universal. It is generally used in heating stations and other places. Vortex flowmeter: with good accuracy and simplified calculation formula, it has low professional requirements and is more commonly used. In terms of range ratio: Orifice flowmeter: The range ratio is 1:3. Vortex flowmeter: The high range ratio can reach 1:15, and the measurable flow range is wider. In terms of pressure loss: Orifice flowmeter: It belongs to the nuclear flow device and has a higher pressure loss than vor
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2. What is the working principle of vortex flowmeter that must be learned for beginners?
The vortex flowmeter is a fluid natural oscillation instrument developed based on the principle of "Karman vortex street". Its core is to calculate the flow rate by detecting the vortex frequency generated by the fluid when it bypasses obstacles.. The following is a detailed explanation of its working principle.
1. Definition of Karman vortex street phenomenon: When a fluid (gas or liquid) passes around a non streamlined obstacle (such as a triangular column or cylinder), two columns of vortices are alternately generated on both sides downstream of the obstacle. The arrangement of vortices is similar to the street lights on both sides of the street, hence it is called "vortex street". Discoverer: This phenomenon was mathematically derived and experimentally verified by aerospace engineer von Karman, hence it is also known as the "Karman vortex street". Key characteristics: The frequency of vortex generation (f) is linearly related to the fluid flow velocity (v) under specific conditions, that is, the
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