Compressor Bleed Port with Variable Diffuser Angle

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Solution Overview

Problem

Prior art compressor bleed ports have limited shape variation, leading to greater than desired pressure losses, which can necessitate positioning further downstream and affect gas turbine engine performance.

Innovation Solution

A compressor bleed port structure with a diffusing angle that varies along the passage length and a curvilinear centerline, minimizing aerodynamic losses and allowing for placement at a lower temperature region.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a bleed port configuration is chosen to align with manufacturing tools (drilling, electric discharge machining), then ease of manufacture is improved, but aerodynamic losses increase and shape variation is limited

Engineering Contradiction:

Improveease of manufactureVSAvoidpressure losses

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent changes the geometric parameters of the bleed port by introducing a variable diffusing angle along the passage length and a curvilinear centerline, transforming the port from a straight cylindrical shape to a tapered configuration with optimized aerodynamic characteristics that reduces pressure losses

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies curvature by defining a curvilinear centerline for the bleed port passage instead of a straight line, and by creating a tapered shape through variable diffusing angles, which improves flow characteristics and reduces aerodynamic losses compared to straight cylindrical ports

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Stress or pressure

If the bleed port is positioned further downstream to compensate for pressure losses, then pressure recovery is improved, but engine performance deteriorates due to higher extraction temperature

Engineering Contradiction:

Improvepressure recoveryVSAvoidextraction temperature

Core Design Contradiction:

Stress or pressureVSTemperature

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design achieves reduced pressure losses and enables the turbomachinery bleed port to be placed in a region of lower temperature, decreasing fuel consumption and increasing the range of operation.

Implementation Method 1

In the diffusing, the bleed port flowpath is shaped to cause a static pressure increase in the air flowing therein

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS11603852B2Compressor bleed port structure

Publication Date: 2023.03.14 GENERAL ELECTRIC CO

AI summary

A compressor bleed port apparatus includes: a compressor shroud which defines a boundary between a primary flowpath and a plenum; a bleed port including one or more apertures passing through the compressor shroud, each of the one or more apertures having an inlet communicating with the primary flowpath and an outlet communicating with the plenum, and extending along a respective centerline. Each of the one or more apertures is bounded by sidewalls, and includes a diffuser section in which the sidewalls diverge from each other in a downstream direction; A diffusing angle between the sidewalls varies over the length of the diffuser section.