| 摘要 |
When a fluid, gas or compressible liquid, is to be used, e.g. as a fuel, it is better to meter the rate of flow of mass, not volume. If the flow is not laminar and particularly if a hydrodynamic oscillator is used, two sensors (7,9), or one differential sensor, can show the frequency of cyclic pressure variations and the amplitude of the differences between the sensors. These give directly, amplitude = K1 x density x (velocity)<2> frequency = K2 x velocity so the rate of mass flow may be determined. Examples are given of a COANDA meter on which the measurements may be made, and of computing circuits by which the data may be converted to mass flow rates. |
