Shape Memory Alloy Mixer Vanes for Exhaust Gas Homogenization
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Solution Overview
Problem
Static mixers in exhaust systems face challenges in achieving adequate homogenization at low flow velocities while minimizing through-flow resistance, especially at higher flow velocities, which can lead to power loss in combustion engines and increased risk of droplet strike-through.
Innovation Solution
The guide vanes of the static mixer are made from shape memory alloys that change shape in response to temperature, providing high through-flow resistance at low temperatures for effective mixing and reducing resistance at high temperatures, aligning with engine load and rotational speed conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide vanes are arranged to be largely covered in projection parallel to line longitudinal direction to prevent droplet strike-through, then mixing effectiveness is improved, but through-flow resistance increases
Solution Approach 1:
The guide vanes are made from shape memory alloys that can dynamically change their shape between low-temperature shape and high-temperature shape in response to temperature changes. This dynamic adaptation allows the vanes to provide high mixing effectiveness and droplet protection at low temperatures, while reducing flow resistance at high temperatures when droplet strike-through risk is lower
Solution Approach 2:
The physical state and geometry of the guide vanes are changed based on temperature parameters. At low temperatures, the vanes maintain a configuration optimized for mixing and droplet containment. At high temperatures, the shape memory alloy transforms the vanes to a configuration that reduces flow resistance, adapting the system's geometric parameters to operating conditions
2Reliability
If mixer is designed for high mixing effectiveness at low flow velocities, then homogenization is improved, but through-flow resistance increases leading to power loss at higher velocities
Solution Approach 1:
The mixer adapts its flow resistance characteristics dynamically through temperature-dependent shape changes of the guide vanes. At low flow velocities and temperatures, the vanes are in a configuration that provides high mixing effectiveness. At higher flow velocities and temperatures, the shape memory alloy transforms the vanes to reduce flow resistance, thereby reducing engine power loss while maintaining adequate mixing
Solution Approach 2:
The system changes its operational parameters by transforming the guide vane geometry in response to temperature and flow velocity changes. This allows the mixer to optimize its performance characteristics for different operating conditions, achieving high homogenization effectiveness at low velocities while minimizing energy losses at high velocities
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 ensures effective mixing at low exhaust gas temperatures with reduced resistance, and higher temperatures enhance droplet evaporation, minimizing the risk of droplet strike-through and maintaining engine power.
Implementation Method 1
the guide vanes (9) are produced of a shape memory alloy in such a manner that they have at least one low-temperature shape and at least one high-temperature shape
Implementation Method 2
Above a predetermined limit temperature the guide vanes (9) have a high-temperature shape which results in a comparatively low through-flow resistance
Implementation Method 3
Below a predetermined limit temperature the guide vanes (9) have a low-temperature shape which results in a comparatively high through-flow resistance
Implementation Method 4
higher temperatures enhance droplet evaporation, minimizing the risk of droplet strike-through
Data Source
AI summary
A static mixer for the through-mixing of a flow in a line conducting the flow, more preferably of an exhaust system of a combustion engine with several guide vanes. To create adequate through-mixing at low flow velocity and a through-flow resistance that is not too high at high flow velocity, the guide vanes are produced of a shape memory alloy wherein below a predetermined limit temperature the guide vanes have at least one low-temperature shape and above the limit temperature the guide vanes have at least one high-temperature shape, which differs from the low-temperature shape through a reduced through-flow resistance of the mixer.