Pulsation damping for damping pulsations upstream of a gas flow meter
First Claim
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1. A method of damping pulsations within a flow line carrying a gas to a flow meter, the pulsations resulting from an engine or other driver, comprising:
- delivering the gas to a damping device comprising an input tube, a chamber, and an output tube, the input tube having a tubing diameter, D, tubing length, L, and cross sectional area, A, and the chamber having a volume, V;
wherein the chamber receives the gas via the input tube and expels the gas to the flow meter via the output tube, and is otherwise sealed;
determining the following fluid properties of the gas in the flow line;
kinematic viscosity, v0, dynamic viscosity, μ
0, and expansion component, m;
specifying a target damping efficiency, {tilde over (ξ
)}L/ξ
0;
determining the following operating conditions of the engine or other driver;
angular frequency, ω
, and pressure, p0;
selecting an input tubing diameter, D, by solving the following equation;
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Abstract
A method of damping pulsations produced by an engine or other driver, so that gas flow can more accurately be measured by a gas flow meter. A damping device is placed between the driver and the flow meter, and has an enclosed volume, an input tube, and an output tube. Particular dimensions of the damping device, namely the volume of the chamber and the diameter and length of the input tube, are calculated to result in a desired damping efficiency.
2 Citations
6 Claims
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1. A method of damping pulsations within a flow line carrying a gas to a flow meter, the pulsations resulting from an engine or other driver, comprising:
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delivering the gas to a damping device comprising an input tube, a chamber, and an output tube, the input tube having a tubing diameter, D, tubing length, L, and cross sectional area, A, and the chamber having a volume, V; wherein the chamber receives the gas via the input tube and expels the gas to the flow meter via the output tube, and is otherwise sealed; determining the following fluid properties of the gas in the flow line;
kinematic viscosity, v0, dynamic viscosity, μ
0, and expansion component, m;specifying a target damping efficiency, {tilde over (ξ
)}L/ξ
0;determining the following operating conditions of the engine or other driver;
angular frequency, ω
, and pressure, p0;selecting an input tubing diameter, D, by solving the following equation; - View Dependent Claims (2, 3, 4, 5, 6)
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Specification