EGR Duct Asymmetric Flow Path for Condensed Water Drainage
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Solution Overview
Problem
Conventional exhaust gas recirculation structures face difficulties in discharging condensed water from the EGR duct without increasing the engine room size, which can lead to corrosion and damage of components on the intake side.
Innovation Solution
The EGR duct is designed with a flow path that gradually lowers in height from the outflow portion to the inflow portion, featuring a cross-sectional shape that changes from circular to quadrangular, allowing condensed water to flow easily from the intake side to the exhaust side, preventing intrusion and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EGR duct is designed with a conventional straight flow path, then the structure is simple, but condensed water cannot be effectively discharged and may cause corrosion
Solution Approach 1:
The flow path is designed to extend in the height direction with a gradual slope from the outflow portion to the inflow portion. This dimensional change creates a gravity-assisted drainage path for condensed water, enabling effective discharge without complex active drainage systems while maintaining structural simplicity.
Solution Approach 2:
The flow path cross-section is designed with asymmetric geometry where the height varies along the flow direction. The flow path is higher at the outflow portion and lower at the inflow portion, creating an asymmetric slope that facilitates condensed water discharge while maintaining a compact overall structure.
2Reliability
If the EGR duct height is increased to improve condensed water discharge, then discharge effectiveness improves, but the engine room size increases
Solution Approach 1:
Instead of increasing the horizontal footprint to improve drainage, the design utilizes the height dimension by creating a gradual slope from the outflow portion to the inflow portion. This allows effective condensed water discharge through gravity while maintaining a compact horizontal profile and minimizing engine room space occupation.
Solution Approach 2:
The flow path is designed with a dynamic slope that varies along the flow direction, creating a gradual descent that facilitates condensed water discharge. This dynamic geometric configuration enables effective drainage without requiring a uniformly large height, optimizing space utilization.
3Loss of energy
If the flow path cross-section is made larger to reduce pressure loss, then flow efficiency improves, but the EGR duct size increases
Solution Approach 1:
The flow path utilizes the height dimension to create a gradual slope that reduces flow resistance and pressure loss. By extending the flow path in the height direction with an optimal slope angle, the design achieves better flow efficiency without requiring a proportionally larger cross-sectional area, thus minimizing duct size.
Solution Approach 2:
The flow path geometry parameters are optimized by varying the height and slope angle along the flow direction. This parameter optimization creates a gradual transition that reduces flow separation and pressure loss while maintaining a compact overall duct size, achieving better energy efficiency without excessive material usage.
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 enables effective discharge of condensed water while maintaining a compact EGR duct size, protecting components on the intake side and reducing pressure loss, weight, and stress concentration.
Implementation Method 1
a flow path through which the exhaust gas flowing in from the inflow portion flows; and an outflow portion from which the exhaust gas flowing through the flow path flows out. The flow path is provided such that a height thereof on the flow path side becomes lower than a height thereof on the outflow portion side
Data Source
AI summary
An exhaust gas recirculation structure includes an EGR cooler and an EGR duct, and the EGR duct includes an inflow portion into which the exhaust gas flowing out from the EGR cooler flows, a flow path, and an outflow portion from which the exhaust gas flows out. The flow path is provided such that the height on the side of the inflow portion is lower than the height on the side of the outflow portion, and has a region in which the distance between the center line of a flow path cross section of the flow path and a line along the lowest end in the height direction gradually increases from the outflow portion side toward the inflow portion side.