Double Scroll Turbine Outlet Height Distribution

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Solution Overview

Problem

In double scroll turbines, exhaust gas leaks from one turbine scroll flow path to another through the housing unit, degrading turbine and engine performance.

Innovation Solution

The turbine features two scroll outlets along the circumferential direction with a height distribution where at least one end has a lower axial height than the surrounding ends, reducing leakage flow by altering the flow rate and pressure difference between the scroll paths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If two turbine scroll flow paths are connected in the housing unit, then the turbine can process exhaust gas from multiple cylinders, but exhaust gas leaks from one scroll flow path to the other through the housing unit

Engineering Contradiction:

Improvecapability to process exhaust gas from multiple cylindersVSAvoidexhaust gas leakage between scroll flow paths

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The scroll outlets are designed with non-uniform height distribution in the axial direction, creating different local geometries at different circumferential positions. This local variation in outlet height suppresses the leakage flow by altering the pressure distribution and flow characteristics at specific locations where leakage occurs.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention introduces a height dimension variation in the scroll outlets that is independent of the radial and circumferential dimensions. By making the axial height of scroll outlets non-uniform, the invention adds a new degree of freedom to control the flow behavior and suppress leakage between scroll paths.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If the scroll outlets have uniform height, then the manufacturing is simple, but the leakage flow cannot be suppressed effectively

Engineering Contradiction:

Improvesimplicity of scroll outlet manufacturingVSAvoideffectiveness in suppressing leakage flow

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Instead of making all scroll outlets identical, the invention applies different heights to scroll outlets at different circumferential positions. This local differentiation improves leakage suppression while maintaining relative manufacturing simplicity through a systematic height distribution pattern.

Inventive Principle:

Principle #3Local quality

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 effectively suppresses exhaust gas leakage between turbine scroll flow paths, enhancing turbine and engine performance by minimizing pressure differences and flow rates through strategic height distribution of scroll outlets.

Implementation Method 1

altering the flow rate and pressure difference between the scroll paths

Methodology Applied

Scientific EffectPressure difference: Pressure Gradient

Implementation Method 2

suppresses exhaust gas leakage between turbine scroll flow paths

Methodology Applied

Scientific EffectFluid flow:

Data Source

PatentUS11821340B2Double scroll turbine flow path

Publication Date: 2023.11.21 IHI CORP

AI summary

A turbine includes: a turbine blade wheel housed in a housing unit; two turbine scroll flow paths wound radially outward with respect to the turbine blade wheel and connected at positions different from each other in a circumferential direction in an outer circumferential portion of the housing unit; and two scroll outlets each communicating one of the two turbine scroll flow paths with the housing unit, the two scroll outlets formed along the circumferential direction, at least one of the two scroll outlets having a height distribution in which a height in an axial direction is lower than a surrounding height at at least one of an upstream end or a downstream end.