Annular Diffuser Vane Configuration for Compressor Choke Prevention

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Solution Overview

Problem

Current compressors in turbochargers face limitations in achieving high static pressure rise efficiency and expanding flow rate range due to choke issues caused by defined throats in diffuser blade rows.

Innovation Solution

The compressor design incorporates an annular diffuser with a first blade row and a second blade row, where the second blade row has twice the number of vanes as the first, and each first vane is arranged to prevent throat formation between adjacent vanes, ensuring no throat is defined, thus distributing load effectively and preventing choke.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stress or pressure

If a diffuser with blade rows is used to raise static pressure, then static pressure rise efficiency is improved, but choke occurs due to throat formation between adjacent vanes

Engineering Contradiction:

Improvestatic pressure rise efficiencyVSAvoidchoke prevention

Core Design Contradiction:

Stress or pressureVSReliability

Solution Approach 1:

The patent extracts and eliminates the harmful throat formation between adjacent vanes in the diffuser blade rows. By removing the throat geometry that causes choke, the design maintains the pressure-raising function while preventing the harmful flow restriction effect.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies different vane configurations to different regions of the diffuser. The number of vanes varies between blade rows, and the angular orientation of vanes is specifically designed to prevent throat formation in critical areas while maintaining effective deceleration in other regions.

Inventive Principle:

Principle #3Local quality

2Stress or pressure

If the number of vanes in the diffuser is increased to improve pressure rise, then static pressure efficiency is improved, but flow rate range is restricted due to choke

Engineering Contradiction:

Improvestatic pressure rise efficiencyVSAvoidflow rate range

Core Design Contradiction:

Stress or pressureVSAdaptability or versatility

Solution Approach 1:

The patent changes the parameters of the diffuser vane system, specifically the number of vanes in different blade rows and their angular orientations. This optimization allows the system to achieve high pressure rise efficiency across a broader flow rate range without encountering choke conditions.

Inventive Principle:

Principle #35Parameter changes

3Stress or pressure

If blade rows are arranged in the centrifugal direction to decelerate fluid, then pressure is raised, but throat formation limits the flow rate range

Engineering Contradiction:

Improvepressure riseVSAvoidflow rate range

Core Design Contradiction:

Stress or pressureVSProductivity

Solution Approach 1:

The patent introduces asymmetry in the vane configuration, with different numbers of vanes in different blade rows and specific angular orientations designed to prevent symmetric throat formation. This asymmetric design disrupts the formation of choke-inducing geometries while maintaining effective fluid deceleration.

Inventive Principle:

Principle #4Asymmetry

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 configuration enhances static pressure rise efficiency and widens the flow rate range by preventing choke occurrences and ensuring efficient gas compression.

Implementation Method 1

an annular diffuser disposed around the impeller, the diffuser decelerating the fluid ejected from the impeller in a centrifugal direction

Methodology Applied

Scientific EffectDiffusion: Diffusion

Implementation Method 2

decelerating the fluid ejected from the impeller in a centrifugal direction

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 3

The intake gas ejected from the compressor impeller in the centrifugal direction is decelerated by the blade rows of the diffuser, so that the pressure of the intake gas is raised

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS10393143B2Compressor with annular diffuser having first vanes and second vanes

Publication Date: 2019.08.27 HONDA MOTOR CO LTD

AI summary

A compressor includes an impeller having a rotational axis. An annular diffuser is provided around the rotational axis to surround the impeller in order to decelerate the fluid discharged from the impeller in a centrifugal direction with respect to the rotational axis. The annular diffuser includes first vanes and second vanes. The first vanes are arranged in a first blade row extending in a circumferential direction around the rotational axis such that two adjacent vanes among the first vanes do not define a throat therebetween viewed along the rotational axis. The second vanes are arranged in a second blade row which extends in the circumferential direction and which is provided farther than the first blade row in the centrifugal direction from the rotational axis. A number of the second vanes is two times or more as large as a number of first vanes.