Multi-Flow Turbine Valve Geometry for Volute Flow Transfer
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Solution Overview
Problem
Multi-channel turbines, such as dual-volute or twin-scroll turbines, face performance issues due to flow separation at high rotational speeds, limiting the controllability and volumetric flow rate between volutes, which affects the efficiency and fuel consumption of internal combustion engines.
Innovation Solution
A valve arrangement with a housing section and a valve body that optimizes the flow transfer between volutes by configuring the wall region between them to be rounded, reducing flow separation and increasing the effective volute connection cross section, allowing better control of exhaust gas flow and pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the separating wall between turbine volutes has sharp edges, then the manufacturing is simpler, but flow separation occurs reducing the effective volute connection cross section
Solution Approach 1:
The patent applies curvature by rounding the edges of the separating wall between the turbine volutes. Instead of sharp edges that cause flow separation, the separating wall features rounded contours that guide exhaust gas flow smoothly from one volute to the other. This curved geometry eliminates dead zones and flow separation, maximizing the effective volute connection cross section and improving the rate of flow transfer between volutes.
2Ease of operation
If the valve body is opened to enable flow transfer, then the controllability of exhaust gas streams improves, but the pressure difference between volutes increases
Solution Approach 1:
The rounded edges of the separating wall reduce flow separation and turbulence when the valve body is opened, enabling smoother exhaust gas flow between volutes. This curved geometry allows for better pressure equalization while maintaining controllability, as the rounded contours guide the flow more efficiently compared to sharp edges that would create turbulent flow patterns and larger pressure differences.
3Productivity
If the effective volute connection cross section is increased, then the rate of flow transfer increases, but the turbine housing size must be enlarged
Solution Approach 1:
The patent increases the effective volute connection cross section not by enlarging the overall turbine housing, but by optimizing the geometry of the separating wall. The rounded edges create a more efficient flow path that effectively increases the connection cross section within the existing housing boundaries, eliminating the need for housing enlargement while improving flow transfer rate.
Data Source
AI summary
The present invention relates to a valve arrangement (100) for a multi-channel turbine (10), having a housing section (300) with a first volute (320), with a second volute (340) and with a connecting region (360) between the first volute (320) and the second volute (340), and having a valve body (110) for closing off the connecting region (360) in a closed position of the valve body (110). A wall region (370) of the housing section (300), which wall region is arranged in the connecting region (360) and is situated opposite the valve body (110) in the closed position, is configured to be optimized in terms of flow to increase, during operation of the valve arrangement (100), a rate of flow transfer of exhaust gas between the first volute (320) and the second volute (340) in an open position of the valve body (110).