9762 papers found
The paper demonstrates the existence of a relationship between stochastic characteristics of the pressure signal and individual phase compositions and flow rates in "wet gas" flow. Neural networks can be trained on these stochastic characteristics to predict (measure) the flow rates of individual phases (liquid and gas).
Based on the turbulence models and computational fluid dynamics (CFD), this paper presents a computational investigation on three-dimensional turbulence flow field of the float-type flowmeter. The forced floating element can be analyzed quantitatively from pressure field and the meter's flow rate from velocity field can be obtained. Meanwhile, this research is combined with an approach proposed by the authors, i.e. the error analysis method of the float-forced-balance-degree', which can realize a reliable estimate of the flow rate of the studied flowmeter. Simulation and experimental results...
On the basis of analyzing flow equation for rotameter, using the flow standard device with master meter method, the rotameter with one type of floater chosen from two different floaters in shape and metal tube from 25 mm caliber to 100 mm caliber had been calibrated. After calculating and analyzing curve between flow coefficient and Reynolds Number (α ~ Re ) of metal rotameter, some laws are founded. Within the upper limit flow rate of metal rotameter, flow coefficient does not tend towards a constant number. Under the double logarithmic coordinate, relation curve of large capacity metal...
An experimental investigation was conducted into the characteristics of an oval gear flowmeter (OGF) using various fluids with different viscosities such as liquid butane (0.17 cP), gasoline (0.40 cP), spindle oil (12.0 cP), etc. Three OGFs were adopted that have a 50 mm inner diameter and ± 0.2 % repeatability in the range of 3 and 17 m³/h . The top and side clearances were measured to see their effects on its overall characteristics. The leakage flow through the clearance between its rotor and casing body was determined by liquid viscosity and the size of the clearance. The amount of the...
In order to accurately predict the variation of the performance curve of the turbine flowmeters according to the change of the viscosity of the flow, several previous mathematical models are compared and analyzed. On the base of the air foil theory, considering the effect of the finite wing spread and the interference between the blades among the cascade, viscous boundary layer theory is applied to the calculation of the lift coefficient C L and the drag coefficient C D at the surface of the blades in this paper. The drag induced by the effects of the leakage flow at the blade tip clearance...
This paper presents an experimental test results on the double turbine mass flowmeter with the corrective property of liquid velocity distribution. Further analysis on its uncertainty has been conducted accordingly.
In the process of design optimization, computational fluid dynamics was used in the present work to better understand the effects of the Reynolds number on the accuracy of a typical turbine flow meter. The complex three-dimensional unsteady flow field in a one-stage turbine gas flow meter was studied by carrying out numerical simulations using the Navier-Stokes equations solver Fluent. The simulation of all the viscous effects as well as secondary flows, such as the flow in the tip gap and secondary and tertiary vortices in the blade to blade region required very high grid resolution but was...
Since the early eighties, Process Gas Chromatographs have been the de facto standard for on-line energy measurement. Being a robust, accurate and widely accepted technology, it is however relatively slow and therefore not suited for control applications. Instromet recently developed both a new generation of Process Gas Chromatographs, and a fast Correlative Energy Meter. This allows to serve the complete on-line energy market, from the accountable measurement systems requiring ultimate precision to control applications with the accent on speed of response. The EnCal 3000 represents a new era...
Heat measurement errors cause revenue discrepancies in the district heating industry. Some of these errors are static and can be estimated using standard error analysis, but the largest error source is the dynamic load such systems are subject to, as in the case of warm water tapping. The frequency at which heat meters estimate and update the energy is either constant or depends on the flow rate. The heat meter power consumption is basically proportional to their estimation frequency. Since the heat meters most often are battery powered this is a sever limiting factor to the introduction of...
Acoustics plays a central role in the current state-of-the-art gas metering equipment. In the last decade the benefits of ultrasonic techniques in fiscal metering of high gas volumes has become apparent. These metering technique expresses lots of advantageous features, like high accuracy, large rangability, low pressure drop and self-diagnostic capabilities. Recently in addition to flow metering applications the acoustic techniques have also been applied in energy flow or Wobbe metering devices. An example of this is the Ensonic, a fast energy meter, which uses a correlative technique based...