Impingement Cooling Mechanism Turbulent Flow Promoting Portions
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Solution Overview
Problem
The existing impingement cooling mechanisms face challenges in effectively raising the heat transfer coefficient between the cooling gas and the cooling target due to crossflow issues, where the cooling gas is swept into the crossflow before reaching the target, reducing cooling efficiency.
Innovation Solution
Incorporating turbulent flow promoting portions in the flow path of the crossflow, which disturb the flow and promote turbulence from the upstream to the downstream side, enhancing the heat transfer coefficient by arranging these portions in greater numbers at the downstream side where the flow rate is higher and fewer at the upstream side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling gas is ejected from impingement holes toward the cooling target, then direct cooling effect is achieved, but the cooling gas is swept into the crossflow before reaching the target, reducing heat transfer coefficient
Solution Approach 1:
The patent introduces a deflecting member as an intermediary element positioned between the impingement holes and the cooling target. This deflecting member redirects the cooling gas flow that would otherwise be swept away by the crossflow, causing it to impinge on the cooling target. The deflecting member acts as a mediator that resolves the conflict between the crossflow direction and the desired cooling gas direction, enabling effective heat transfer while utilizing the limited cooling gas supply.
2Temperature
If turbulent flow promoting portions are added to the flow path, then heat transfer coefficient is raised, but device complexity increases
Solution Approach 1:
The patent employs a deflecting member with a specific structure that includes multiple deflecting surfaces arranged to create turbulent flow patterns. Rather than using complex active control systems or multiple separate components, the invention utilizes a integrated deflecting structure that passively generates turbulence and enhances heat transfer. The deflecting member's geometry is designed to interact with the cooling gas flow, creating rotational and turbulent motion that increases the heat transfer coefficient without requiring additional energy input or complex control mechanisms.
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 approach effectively utilizes the limited cooling gas flow rate, improving the cooling effect by increasing the heat transfer coefficient between the crossflow and the cooling target, ensuring better direct cooling of the target and efficient heat transfer.
Implementation Method 1
turbulent flow promoting portions are provided in a flow path of a crossflow, and by disturbing the flow of the crossflow by the turbulent flow promoting portions, it is possible to raise the heat transfer coefficient between the crossflow and the cooling target
Implementation Method 2
a plurality of impingement holes are formed in an opposing member that is arranged opposite a cooling target and that ejects cooling gas from the impingement holes
Implementation Method 3
raise the heat transfer coefficient between the crossflow and the cooling target
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3A~3B
AI summary
The present invention relates to an impingement cooling mechanism (1) that ejects a cooling gas (G) toward a cooling target (2) from a plurality of impingement holes (4) formed in an opposing member (3) that is arranged opposite the cooling target (2). Turbulent flow promoting portions (6) are provided in the flow path of a crossflow (CF), which is a flow that is formed by the cooling gas (G) after being ejected from the impingement holes (4). The turbulent flow promoting portions (6) are constituted so that a turbulent flow is promoted from the upstream side to the downstream side of the crossflow (CF).