出口宽高比对 S 弯喷管热固耦合响应的影响

In order to clarify the effect of exit aspect ratio on the flow heat transfer and structural response of serpentine nozzle，a serial two-way loose coupling method based on computational structural dynamics/computational fluid dynamics (CFD/CSD) was used to study the effect of thermal-solid coupling response at different aspect ratios. Results were obtained as follows：the overall heatflux distribution of the nozzle under the action of the bending configuration was not uniform， with large variability at each location， while the heatflux distribution of individual nozzles was similar; the heatflux increased continuously at the second bend as exit aspect ratio increased; the vortex structure was generated at the exit isometric section，and the presence of the vortex structure hindered the heat transfer; in structural response，the distribution of stress in each serpentine nozzle was similar，but the maximum stress existed in two locations，including the nozzle exit end and the upper wall of the second bend channel. As the exit aspect ratio rose，the maximum stress also rose，and appeared in advance. Maximum stress with aspect ratio of 10 increased by 28% compared with the minimum stress，and the moment of appearance was 23.84 s earlier.