Turbine Volute with Concave Flow Area for Pulsating Exhaust
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Solution Overview
Problem
Conventional turbine arrangements are inefficient in converting pulsating exhaust gases from combustion engines into mechanical power due to suboptimal design of the curved flow passage, which does not effectively manage pressure pulses of varying amplitudes.
Innovation Solution
A turbine arrangement with a curved flow passage that continuously decreases its cross-sectional area from an initial to an end angular position, achieving a concave shape, allowing for optimized efficiency when receiving pulsating exhaust gases. The design adjusts the area reduction based on the amplitude of pressure pulses, with specific area ratios at different angular positions to enhance energy conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cross section area of the curved flow passage decreases linearly in the flow direction, then the design is simple and easy to manufacture, but the turbine efficiency is suboptimal when receiving pulsating exhaust gases
Solution Approach 1:
The patent applies parameter changes by transforming the linear area decrease into a continuously decreasing area with successively reduced values. The cross-sectional area at any angular position is determined by a concave function that adjusts the rate of area reduction based on the pulsating nature of exhaust gases, thereby optimizing turbine efficiency while maintaining manufacturing feasibility through defined geometric relationships
Solution Approach 2:
The patent implements local quality by creating different area reduction characteristics at different angular positions within the curved flow passage. The area decrease is not uniform but is tailored to specific angular positions to match the pulsating pressure patterns of exhaust gases from combustion engines, with the rate of area reduction varying locally to maximize energy conversion efficiency
2Productivity
If the cross section area decreases continuously with successively reduced value creating a concave shape, then the turbine efficiency improves for pulsating exhaust gases, but the design complexity increases
Solution Approach 1:
The patent uses parameter changes to define the concave shape through a mathematical relationship where the cross-sectional area at any angular position is determined by a function that continuously reduces the area with successively smaller increments. This approach optimizes turbine efficiency for pulsating exhaust gases while controlling design complexity through a defined geometric model rather than arbitrary complex geometry
Solution Approach 2:
The patent applies curvature principles by designing the curved flow passage with a concave area profile that smoothly varies along the flow direction. The continuous curvature of the area reduction creates an optimized flow path that adapts to pulsating pressure patterns, transforming the linear geometry into a curved, adaptive geometry that enhances turbine performance
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 significantly improves turbine efficiency by effectively managing pressure pulses of varying amplitudes, leading to higher overall efficiency of the combustion engine by ensuring optimal energy conversion from pulsating exhaust gases.
Implementation Method 1
the cross section area of the curved flow passage decreases continuously in the flow direction of the exhaust gases from an initial angular position to an end angular position located about 360° from the initial angular position
Implementation Method 2
A turbine arrangement may comprise a turbine wheel arranged in a turbine housing designed with a volute receiving exhaust gases from a combustion engine
Data Source
AI summary
The present invention relates to a turbine arrangement driven by exhaust gases from a combustion engine. The turbine arrangement comprises a turbine housing, a turbine wheel rotatably arranged in the turbine housing, a first volute section defining a curved flow passage extending about 360° around the periphery of the turbine wheel, and an inner radial passage directing exhaust gases radially inwardly from the flow passage into a swept area of the turbine wheel. The curved flow passage has a cross section area decreasing continuously in the flow direction of the exhaust gases from an initial area at an initial angular position of the curved flow passage to an end angular position. The flow area decreases continuously with a successively reduced value from the initial angular position to an angular position located at least 270° from the initial angular position.