Heat Transfer Characteristics of Array Impingement Jet with Block-off Corrugated Structure

Impingement jet cooling is a method to obtain high heat transfer performance by injecting coolant on the target surface. A cooling method that secures high heat transfer performance over a large area by arranging multiple impingement jets is called an array impingement jet. However, since the coolant injected from the holes arranged in a certain direction impinge with the target surface and exit through the outlet formed downstream, a cross-flow is generated, which results in a degradation of cooling performance. Recently, corrugated structures have been studied to overcome the degradation of heat transfer performance due to cross-flow. In this study, a block-off structure was applied to the corrugated structure for more effective cross-flow reduction. The block-off structure serves to minimize the degradation of heat transfer performance due to cross-flow by forcibly moving coolant to the corrugated structure. The numerical analysis was performed to investigate the flow and heat transfer characteristics of the array impingement jet with the corrugated structure and block-off structure. With the block-off structure, it was confirmed that the thermal performance was improved by about 5% compared to the existing geometry.