Heat transfer analyses of film-cooled HP turbine vane considering effects of swirl and hot streak. (September 2018)

• Record Type: Journal Article
• Authors: Wang, Zhiduo; Wang, Dian; Wang, Zhihao; Feng, Zhenping
• Is Part Of: Applied thermal engineering. Volume 142(2018)
• Page Start: 815
• Page End: 829
• Publication Date: 2018-09
• Subjects: Gas turbine -- HP turbine first vane film cooling -- Inlet swirl -- Hot streak -- Conjugate heat transfer; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2018.07.044
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Conjugate heat transfer analyses were performed for a film-cooled vane to reveal the effects of swirl and hot streak. Swirl worsens the attachment of film coolant and its effects are susceptible to swirl orientations and positions. Negative swirl aligned to vane is preferred for reducing heat load of vane leading edge. Heat transfer coefficient on suction side is elevated due to the effect of transportation of swirl. Abstract: Conjugate heat transfer (CHT) analyses were conducted on the film-cooled first stage vane of GE-E 3 engine to reveal the influences of inlet swirl and hot streak (HS) on vane film cooling. Two cases with only HS and four cases considering with combined HS and swirl were studied, including the effects of HS/swirl to vane clocking positions (HS/swirl aligned to passage or vane) and swirl orientations (positive/negative). The results indicate that the variations of incidence angle combined with effects of radial transportation of the swirl vortex worsen the film coolant attachment, decrease the film cooling efficiency and increase the heat load onto vane surface. However, for film holes with radial angles toward the outer endwall, negative incidence near hub endwall is beneficial to the leading edge film coolant attachment. Therefore, a negative swirl aligned to the vane leads to lowering the temperature at the leading edge and the pressure side than the other three cases with combined swirl and HS. Heat transfer coefficient (HTC) on the suction surface (SS) is increased due to upwash and downwash of boundary layer fluids caused by swirl. The temperature on SS is therefore increased because the heat energy transferred from fluid to solid is increased.