Numerical investigation for influence of chute seal configuration of a counter-rotating turbine cavity on hot gas ingestion
The numerical simulation method was used to study the influence of the chute seal configuration of the high-pressure wheel flange on hot gas ingestion,and the results showed that under low sealing flow,the radial expansion of the end of the high-pressure wheel flange caused the decrease of pressure gradient in the wheel flange gap,which delayed the separation of the boundary layer of the low-pressure wheel flange,while the radial expansion of the high-pressure wheel flange caused the increase of mainstream flow velocity in the endwall region,and the ability of the fluid to resist the inverse gradient was enhanced.As a result,the sealing efficiency increased by 46.95％;with the increase of the sealing flow,the pressure of the sealing flow in the disk cavity gradually increased,the sealing efficiency was gradually improved due to the enhancement of the sealing flow outflow capacity,and the radial upward movement effect of the sealing vortex core induced by the radial expansion of the high-pressure wheel flange was weaker than the influence of the increase of the sealing flow on the sealing efficiency,so with the increase of the sealing flow,the increase of sealing efficiency gradually decreased.
hot gas ingestioncounter-rotating turbinecounter-rotating cavitychute seal configurationsealing efficiency
万方数据
维普
