EGR Cooler Elongated Through-Hole Flow Uniformity
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Solution Overview
Problem
The existing engine intake and exhaust systems face challenges in efficiently cooling exhaust gas recirculation (EGR) gas due to non-uniform flow rates and stagnation of condensed water, which reduces the cooling efficiency of the EGR cooler.
Innovation Solution
The EGR cooler is coupled to the exhaust passage wall at an EGR gas inlet side with a through-hole elongated in the flow direction, ensuring a uniform flow rate of EGR gas and improved utilization efficiency, while the EGR passage extends vertically to facilitate easy discharge of condensed water and optimize gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EGR passage is arranged horizontally, then condensed water stagnates in the horizontal part reducing cooling efficiency, but arranging it vertically improves water discharge while increasing passage resistance
Solution Approach 1:
The through-hole is elongated in the flow direction of exhaust gas, creating a directional opening that allows EGR gas to enter the cooler from multiple positions along the flow path. This dimensional change in the opening geometry enables uniform gas distribution without requiring a vertical passage arrangement, thus maintaining low passage resistance while preventing water stagnation through improved flow dynamics
2Area of stationary object
If a circular through-hole is used, then the opening area is maximized, but the EGR gas flow strength varies across the hole causing non-uniform cooling
Solution Approach 1:
The through-hole is designed as an elongated opening rather than a circular one, creating an asymmetric geometry that aligns with the exhaust gas flow direction. This asymmetric shape ensures that EGR gas enters the cooler uniformly across the entire opening area, as the elongated form distributes the gas flow more evenly compared to a circular hole where flow strength varies from center to edge
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 enhances the cooling efficiency of EGR gas by maintaining a uniform flow rate and preventing water stagnation, thereby improving the overall performance of the EGR cooler and reducing the risk of malfunctions from condensation.
Implementation Method 1
an EGR cooler disposed in the EGR passage, the EGR cooler being coupled to a passage wall of the exhaust passage at an EGR gas inlet side
Implementation Method 2
A through-hole communicating the EGR cooler with the exhaust passage is formed into a long hole elongated in the flow direction in the exhaust passage
Data Source
AI summary
An intake and exhaust system of an engine is provided, which includes an exhaust gas recirculation (EGR) passage configured to recirculate a portion of exhaust gas as EGR gas, from an exhaust passage of the engine to an intake passage, and an EGR cooler disposed in the EGR passage, the EGR cooler being coupled to a passage wall of the exhaust passage at an EGR gas inlet side, and having a center line intersecting with a flow direction of exhaust gas in the exhaust passage. A through-hole communicating the EGR cooler with the exhaust passage is formed into a long hole elongated in the flow direction in the exhaust passage.