科研之友
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摘要
The high pressure turbine is subjected to the inlet hot gas resulting from the combustor, which is generally non-uniform. The strong non-uniform temperature at the turbine inlet is known as "hotstreak' Although many studies have been performed to investigate the hotstreak migration in the turbine vane, passage, the HS, is generally modeled to be steady and there are relatively few studies on the unsteady oscillating hot streak (OHS). The resent study performs numerical investigations on the oscillation effects on the HS migration characteristics. The OHS is modeled to be oscillating in the circumferential direction, with varying oscillation magnitude and frequency. The steady hot streak (SHS) is modeled toy be positioned at the guide vanes. Comparisons between the SHS and the OHS are conducted in detail regarding the flow and heat transfer characteristics. Both of the two cases of HS are based on the NASA experiment report and the No. 4313 case in the experimental design is selected. It is found that the change of HS from steady to oscillating leads to significant differences of transient periodic fluctuating characteristics of heat load and Pressure on the guide vane. The HS areas are increased significantly and the mean temperature is decreased correspondingly. The introduction of oscillation effects is found to merit a better prediction of the real HS migration features in the real turbine passage.
- 出版日期2019
- 单位南京航空航天大学
