Thermal Performance of Cooled Tips in a High-Pressure Turbine Cascade

doi:10.2514/1.B34299

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	Thermal Performance of Cooled Tips in a High-Pressure Turbine Cascade
	Zhou, Chao ; Hodson, Howard ; Lock, Gary
刊名	journal of propulsion and power
	2012
关键词	HEAT-TRANSFER COEFFICIENTS FILM-COOLING EFFECTIVENESS BLADE TIP ADIABATIC EFFECTIVENESS SIDE HOLES PART II SQUEALER
DOI	10.2514/1.B34299
英文摘要	The thermal performance of the three turbine tips was investigated. The results are presented in terms of heat-transfer coefficient (h), cooling effectiveness (eta) net heat-flux reduction (NHFR), and heat load. The calculations were performed using a cooled flat tip, a cooled cavity tip, and a cooled suction-side squealer tip in a cascade at a tip gap of 1.6%C. The results were validated using experimental data where possible. For an uncooled flat tip, the fluid dynamics are dominated by flow separation at the pressure-side edge. A significant benefit of ejecting coolant inside this separation bubble is shown. At the coolant mass-flow ratio M-c = 0.52%, both the cooled flat tip and the cooled cavity tip are well-protected by the coolant. For the cooled suction-side squealer tip, the coolant lifts off from the tip floor and leads to not only low cooling effectiveness, but also to high heat-transfer coefficients. The effects of the coolant mass-flow ratio on the thermal performance of the tip were presented. The effects of end-wall motion on the thermal performance of the blade tip are found to be small in the current study.; Engineering, Aerospace; SCI(E); EI; 1; ARTICLE; 5; 900-911; 28
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/315955]
专题	工学院
推荐引用方式 GB/T 7714	Zhou, Chao,Hodson, Howard,Lock, Gary. Thermal Performance of Cooled Tips in a High-Pressure Turbine Cascade[J]. journal of propulsion and power,2012.
APA	Zhou, Chao,Hodson, Howard,&Lock, Gary.(2012).Thermal Performance of Cooled Tips in a High-Pressure Turbine Cascade.journal of propulsion and power.
MLA	Zhou, Chao,et al."Thermal Performance of Cooled Tips in a High-Pressure Turbine Cascade".journal of propulsion and power (2012).