Parallel Partition Wall in Forced-Induction Connection Pipe
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Solution Overview
Problem
Existing forced-induction devices for internal combustion engines face challenges in minimizing backflow of exhaust gases between cylinders with different combustion stroke timings, leading to pressure pulsations and interference of exhaust gas flows, which reduces the effectiveness of exhaust gas merging and turbine wheel rotation.
Innovation Solution
A forced-induction device with a connection pipe featuring parallel downstream line segments and equal cross-sectional flow areas in adjacent passages, which minimizes backflow by ensuring parallel exhaust gas flows and enhances the Venturi effect, allowing smooth merging of exhaust gases and consistent turbine wheel rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If exhaust gas flows from multiple cylinders with different combustion stroke timings into a common passage, then the turbine wheel can be driven effectively, but backflow of exhaust gas between cylinders occurs causing pressure pulsations and flow interference
Solution Approach 1:
The connection pipe is segmented into multiple independent passages (first passage, second passage, etc.) by partition walls. Each passage is dedicated to exhaust gas from a specific cylinder, preventing backflow between cylinders while maintaining effective turbine wheel rotation through the merged exhaust flows in the scroll passage.
2Productivity
If the partition wall is positioned to maximize exhaust gas merging, then the efficiency of exhaust gas flow into the turbine housing is improved, but pressure pulsations increase due to flow interference
Solution Approach 1:
The partition wall is positioned at specific locations within the connection pipe to create optimal flow conditions in different zones. The distal end of the partition wall is positioned to allow smooth merging of exhaust gases in the scroll passage while the parallel downstream line segments maintain stable pressure by preventing flow interference, achieving both high efficiency and low pulsation.
3Volume of moving object
If the downstream line segments of the partition wall are arranged to maximize space utilization, then the compactness of the device is improved, but backflow occurs reducing turbine efficiency
Solution Approach 1:
The downstream line segments of the partition wall are arranged parallel to each other rather than symmetrically or at angles. This asymmetric parallel arrangement prevents backflow and maintains consistent exhaust gas flow direction to the turbine wheel, maximizing turbine efficiency while the overall compact design is achieved through optimized passage routing in the scroll passage.
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
The solution effectively suppresses backflow of exhaust gases and maintains consistent turbine wheel rotation speed, reducing pulsation in boost pressure and improving the efficiency of exhaust gas flow into the turbine housing.
Implementation Method 1
enhances the Venturi effect, allowing smooth merging of exhaust gases
Data Source
AI summary
A forced-induction device includes a turbine wheel, a turbine housing, and a connection pipe. The connection pipe includes a partition wall that partitions the inside of the connection pipe into a first passage and a second passage. When a cross section orthogonal to a rotation axis of the turbine wheel is viewed, a line segment extending from the distal end of the partition wall toward the upstream side in the flow direction of exhaust gas and defining a boundary between the first passage and the partition wall is a first downstream line segment. A line segment extending from the distal end of the partition wall toward the upstream side in the flow direction of exhaust gas and defining a boundary between the second passage and the partition wall is a second downstream line segment. The first downstream line segment and the second downstream line segment are parallel to each other.