As the temperature of gas turbines continues to rise, turbine cooling faces significant challenges. Facing significant flow and heat transfer non-uniformity issues in turbines, the ability of artificially defined topological structures to control physical fields is insufficient. Therefore, it is necessary to utilize intelligent geometry algorithms to address such bottleneck issues in turbine cooling. This study applies self-organizing structures with biomimetic capabilities to flat double-wall cooling systems, addressing the issue of non-uniformity in turbine cooling. Referencing the impingement-film cooling layout in the first-stage vane of the turbine, typical features of the inlet and outlet of the double-wall cooling area were extracted. A geometric modeling method based on the self-organized algorithm, which uses the diffusion-anti-diffusion equation, was applied to generate topological structures. These were then used as flow disruption structures to create a new impingement-film-disruption cooling structure. This study conducts numerical simulations on four different configurations of flat double-wall structures, comparing the heat transfer and flow performance of double-wall cooling systems incorporating self-organized structures under various parameters. The results indicate that for flat double-wall structures, the more fully the self-organized structures grow within the limited space of the impingement chamber, the greater the improvement in heat transfer performance. The flow field of the impingement-film-self-organized structure composite within the flat double-wall is significantly different from the traditional impingement-film flow field. Considering different combinations of self-organized parameters, when the self-organized structure can guide the impingement cross-flow towards the film cooling holes within the impingement chamber, it results in reduced flow losses and enhances heat transfer.

In confined spaces, due to various interfering factors, oblique detonation waves inevitably reflect off the walls, resulting in the formation of a Mach stem. When the Mach reflection is excessively strong, it can lead to the instability of the oblique detonation waves. Therefore, it is necessary to study the stability characteristics of the reflected wave system. Based on a simplified combustor-nozzle model, this paper studies the effects of jet injection on the stability of oblique detonation waves in confined space. The results indicate that injecting a jet on the wedge surface reduces the angle of the oblique detonation waves, decreases the intensity of Mach reflection, and enhances the stability of the wave structures. The oblique detonation waves induced by jets of varying pressure exhibit different characteristics. Compared to a hot jet, cold jet can induce a stronger shock wave at the same pressure. Both excessively high or low jet pressure can lead to a reduction in the stability of the wave structures.

To elucidate the detailed mechanism of the fan swirling flow on generator internal cooling, a numerical investigation was conducted on a compact fan-generator system designed for small aircraft, characterized by high rotational speeds and elevated power densities. A simplified three-dimensional axial fan-generator integration model was developed, employing coupled fluid-thermal numerical methodology to analyze the internal flow field and heat transfer processes. And the isolated generator with uniform inflow, which usually represents the ram-air cooling in aircraft are also compared with fan-generator integration. The results reveal that the fan swirling flow enhances turbulence generation, effectively modifying flow structures to eliminate stagnant zones and mitigate heat accumulation. It leads to a better cooling performance, especially for the upstream components where the high power-density electric element should be arranged. Additionally, it is revealed that the circumferential and radial components of the velocity play important roles in cooling some hot surfaces of key components of the generator, even at the similar mass flow rate. The augmentation of total fluid velocity induced by the fan swirling further intensifies convective heat transfer. This study provides comprehensive insights into temperature distribution patterns and flow characteristics, offering valuable guidance for optimizing energy-efficient and reliable generator cooling system designs.