A review of cooling channels with broken ribs applied for internal cooling of a turbine blade

This is the authors' abstract. We don't add key points for this paper.

By reducing recirculation and forming a transverse secondary flow, broken ribbed channels can effectively improve the low-heat transfer region caused by recirculation behind the ribs. A vast body of existing literature primarily focus on geometric parameters, arrangements and types of broken ribs solely while heat transfer enhancement mechanism and design idea are not clearly revealed and summarized in different application circumstance. This paper summarizes recent progresses on broken ribs from two aspects, i.e., truncated ribs and perforated ribs, including geometric shapes, arrangements, truncation positions, truncated ratios, perforation angles, perforation ratios, attack angles and boundary conditions. By re-constructed flow-fields, vortex patterns and high heat transfer regions in previous studies are furtherly analyzed and compared, which is highly conducive to establishing a generalized design paradigm for the application of broken ribs. In addition, the advantages and limitations of different kinds of broken ribs are analyzed by discussing on thermal performance, pressure loss penalty and mechanical strength considering application circumstances and investigation methods. Finally, new trends of investigations on cooling channels with broken ribs are analyzed. Broken ribs have shown good prospect for internal cooling with pretty large heat transfer enhancement and improved thermal performance.