Cylinder Head Cooling Baffle Plate Flow Guide
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Solution Overview
Problem
The second portal in a cylinder head's liquid cooling system, located in the flow shadow of the first portal, experiences diminished cooling, leading to elevated temperatures that can cause pre-inflammation, knocking, and mechanical failure in internal combustion engines, especially in charged engines.
Innovation Solution
A cylinder head design with a liquid jacket featuring a flow guide wall and baffle plate that diverts a portion of the coolant flow transversely to the second portal, creating a coolant jet to enhance cooling, and the use of flow guide walls with constricting and expanding cross sections to accelerate coolant flow and improve heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a liquid cooling system with a main flow pathway is used in the cylinder head, then cooling efficiency is improved, but the second portal located in the flow shadow of the first portal experiences diminished cooling
Solution Approach 1:
The cooling system is segmented into a main flow pathway and a branch flow pathway. The baffle plate divides the cooling flow, directing a portion through the branch pathway to the second portal, ensuring uniform cooling distribution across both portals despite their positional relationship in the flow shadow.
Solution Approach 2:
Different regions of the cylinder head receive different cooling flow rates tailored to their specific thermal requirements. The second portal, located in the flow shadow, receives an enhanced portion of cooling flow through the branch pathway, while the first portal receives the main flow, creating locally optimized cooling quality for each region.
2Device complexity
If the second portal is located in the flow shadow of the first portal to simplify the cooling system layout, then device complexity is reduced, but temperature distribution becomes non-uniform
Solution Approach 1:
The cooling flow is redirected into a different spatial dimension by introducing a branch flow pathway that extends laterally from the main flow pathway. This dimensional change allows the cooling flow to reach the second portal in the flow shadow region without requiring a complete redesign of the overall cooling system layout.
3Temperature
If coolant flow is increased to cool the second portal more effectively, then temperature is reduced, but energy consumption increases
Solution Approach 1:
Instead of increasing the total coolant flow through the entire system, only a partial portion of the cooling flow is diverted through the branch pathway to the second portal. This partial action approach provides sufficient cooling to the second portal without the excessive energy consumption that would result from increasing the overall coolant flow rate.
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 design effectively reduces the temperature of the second portal by approximately 15°C, preventing pre-inflammation and knocking, and ensuring sufficient cooling of the ignition plug, thereby reducing the risk of mechanical failure.
Implementation Method 1
The baffle plate is designed to branch off a portion of the coolant in a direction of flow transverse to the main flow pathway, toward the second portal
Implementation Method 2
the flow guide wall with a constricting flow cross section, and a baffle plate in the liquid jacket, which is situated downstream from the flow guide wall in the direction of the main flow pathway
Implementation Method 3
a coolant can be forced to cool thermally critical areas more intensively by taking suitable measures and shaping the water jacket
Implementation Method 4
a coolant flows along a main flow pathway from a coolant inlet to a coolant outlet
Data Source
AI summary
A cylinder head is provided with liquid cooling system and a method for cooling the cylinder head. The cylinder head includes, but is not limited to a liquid jacket in which a coolant flows along a main flow pathway from a coolant inlet to a coolant outlet. The liquid jacket is interrupted between the coolant inlet and coolant outlet by portals to cylinders of an internal combustion engine. A second portal is arranged in a flow shadow of a first portal. The cylinder head in the liquid jacket exhibits a flow guide wall with a constriction of the flow cross section, and a baffle plate, which is arranged in the direction of the main flow pathway, downstream from the flow guide wall. The baffle plate is designed to divert a coolant flow branch in a direction of flow transverse to the main flow pathway, toward the second portal.