Abstract
A fluidic oscillator type flow meter for domestic gas meter must have a simple structure suitable for mass production, and it must measure gas accurately in wide range of flow rate at low pressure loss.
A simple fluidic oscillator with only one element (target) was proposed by one of authors.
An attempt was made to improve this new type of fluidic oscillator aiming at replacement of conventional membrane type gas meters.
Our research proved that measuring accuracy can be improved in two different ways:
1) Optimizing shape and dimension of oscillator
2) Incorporating a flow straightener to make a inlet jet two-dimensional.
Obtained performances are as follows: Linearity less than ±0.8% of reading within flow range 0.15∼5.0m3/h (fluidic flow meter range), reproducibility less than ±0.2% of reading.
