Online estimation of specific gravity of gas fuel
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United States of America Patent
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Aug 15, 2017
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app pub date -
Apr 30, 2015
filing date -
Apr 30, 2015
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Abstract
A method for determining an estimate of the specific gravity of a fuel for a gas turbine engine is disclosed. The gas turbine engine includes a fuel control valve and one or more fuel injectors. The method includes determining a first estimate of the specific gravity based on an orifice flow model of the fuel control valve. The method also includes determining a second estimate of the specific gravity based on a combined orifice flow model of the one or more fuel injectors. The method further includes recursively filtering the first estimate and the second estimate to determine a third estimate of the specific gravity.
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