Turbine Baffle Segments Twin Volute Outlet
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Solution Overview
Problem
In turbochargers with twin volute radial turbines, pressure pulses from wastegate passages interfere, leading to impedance in gas flow due to pressure differences between the passages, reducing wastegate efficiency.
Innovation Solution
A turbine design featuring a baffle that separates the outlet portions, redirecting pressure pulse interference away from the bypass passages, thereby reducing flow impedance and enhancing efficiency by creating a more tortuous path for exhaust gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a twin volute radial turbine with wastegate is used, then the turbine can regulate power output by bypassing exhaust gas, but pressure pulses from the two wastegate passages interfere with each other, causing impedance to gas flow and reducing wastegate efficiency
Solution Approach 1:
The outlet is divided into a first outlet portion and a second outlet portion using a baffle, with each outlet portion connected to its own separate wastegate passage. This segmentation prevents pressure pulse interference between the two passages while maintaining the ability to regulate power output through the wastegate system.
2Quantity of substance
If exhaust gas flow is increased through the wastegate, then power regulation is improved, but pressure differences between the two wastegate passages create impedance that reduces overall flow capacity
Solution Approach 1:
By segmenting the outlet into separate first and second outlet portions with a baffle, each wastegate passage operates independently without pressure pulse interference from the other passage, thereby reducing flow impedance and increasing overall exhaust gas flow capacity through the wastegate system.
Data Source
AI summary
There is provided a turbine comprising: a turbine housing; a turbine wheel; an inlet upstream of the turbine wheel, the inlet defining a first inlet portion and a second inlet portion; an outlet downstream of the turbine wheel, the outlet defining a first outlet portion and a second outlet portion; and a wastegate arrangement configured to selectively vent exhaust gas from the first inlet portion to the first outlet portion via a first bypass passage, and further configured to selectively vent exhaust gas from the second inlet portion to the second outlet portion via a second bypass passage; wherein the first outlet portion and the second outlet portion are separated by a baffle of the turbine housing.