Inlet bellmouth with coating in measurement annulus region
a technology of inlet bellmouth and measurement annulus, which is applied in the direction of machines/engines, stators, liquid fuel engines, etc., can solve the problems of affecting the cost effectiveness of the correction factor based on sampling, and affecting the accuracy of mass flow rate calculations
Inactive Publication Date: 2016-02-25
GENERAL ELECTRIC CO
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Benefits of technology
The patent text aims to address specific problems or issues related to a certain aspect. The technical benefit of the disclosed aspects is designed to address these problems and provide a solution.
Problems solved by technology
One challenge in determining the static pressure in the inlet bellmouth is that an inlet annulus area where the pressure is measured must be accurately known.
However, conventional inlet bellmouths are oftentimes manufactured as a cast component having significant variation and large tolerances in an internal surface thereof, i.e., they are uneven or rough.
The variations and large tolerances in the inlet bellmouth diminish static pressure measurement accuracy by a static pressure sensor system, and thus hinder accurate mass flow rate calculations.
However, since there are large variations between inlet bellmouths that are created, and the inlet bellmouth's internal surface may change over time, use of a correction factor based on a sampling is not ideal.
While casting or machining an inlet bellmouth with less surface variation is feasible, it is generally not cost effective.
Such an approach to manufacturing also does not correct the problem for previously installed inlets.
Method used
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[0015]As indicated above, the disclosure provides an airflow inlet having a coating in a measurement annulus region of a bellmouth component. Referring to FIG. 1, a cross-sectional view of an airflow inlet 100 including a variable thickness coating 102 on a bellmouth component 104 according to embodiments of the invention is illustrated. The illustrative setting for airflow inlet 100 includes a compressor 110 for, e.g., a gas turbine. Compressor 110 includes a turbine (or turbo-fan) 112 for drawing an airflow 114 into bellmouth component 104. Bellmouth component 104 may include any structure through which airflow initially passes as part of an intake. In most but not all cases, a bellmouth 104 acts to collect airflow 114, and direct it to turbine 112 in which extensive compression occurs prior to the airflow being passed to other components (not shown). Bellmouth component 104 may be referred to by various alternative names such as: intake, compressor intake, bellmouth, flow nozzle,...
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Abstract
An airflow inlet may include a bellmouth component having a substantially uneven internal surface, and a variable thickness coating in a measurement annulus region of the substantially uneven internal surface. The measurement annulus region includes only an annulus about the internal surface of the bellmouth component. The variable thickness coating is configured to present a more even internal surface than the substantially uneven internal surface.
Description
BACKGROUND OF THE INVENTION[0001]The disclosure relates generally to airflow inlets, and more particularly, to an airflow inlet bellmouth having a coating thereon to reduce a surface roughness thereof, and a related method.[0002]Airflow inlets to industrial devices such as gas turbine compressors include a bellmouth component that acts to collect, initially compress, and direct an airflow, e.g., toward a turbine portion of the compressor. In many settings, during operation, static pressure is measured in the inlet bellmouth component, for example, using a Pitot method. The static pressure may be used to determine a mass flow rate of air which is used to better control operation of other components, for example, controlling a firing temperature of a combustor of a gas turbine. In another example, mass flow rate may be used to determine a compressor operating limit degradation.[0003]One challenge in determining the static pressure in the inlet bellmouth is that an inlet annulus area w...
Claims
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Login to View More IPC IPC(8): F04D29/02F04D29/40
CPCF04D29/403F04D29/023F04D27/001F04D29/4213F04D29/545F05D2300/43F05D2300/603F05D2300/611
Inventor MORGAN, REX ALLENWATTS, STEPHEN RONALD
Owner GENERAL ELECTRIC CO