Session: 13-06 - Internal and External Flows

Paper Number: 124933

124933 - Aerothermal Performance of Slashface Leakage With Double Surface Angle Under Realistic Swirling Inflow 

The turbine vanes being manufactured and assembled piece by piece leads to an unavoidable gap on the vane endwall called slashface. Usually, the coolant leakage introduced from the slashface with a single surface angle aims to prevent hot gas ingression and protect the vane endwall. However, the cooling effectiveness is greatly reduced when considering the swirling flow from the combustor. In current work, against strong swirling inflow, a new solution to improve endwall film cooling performance which applying the slashface leakage with the double surface angle is carried out. Through numerical method, the effects of the location of the angle transition zone (D/L=0%, 25%, 50%, 75%, 100%) and mass flow ratio (MFR=0.5%, 1.0%, 1.5%) of the leakage on the turbine vane endwall aerothermal and film cooling performance are investigated. The results indicated that the coverage area of the coolant on the endwall was obviously enlarged when the slashface leakage with the double surface angle was employed. Moreover, the endwall thermal load was reduced by 20%. The film cooling level on both the endwall and suction side surface of the vane increased with the MFR increased. D/L=50% was the best design for the highest area-averaged film cooling 0.28 was achieved. This paper provided turbine designers with a new idea to increase endwall film cooling performance by the slashface leakage with the double surface angle when considering aggressive swirling inflow.

Presenting Author: Zhiyu Li Institute of Turbomachinery, Xi'an Jiaotong University

Presenting Author Biography: Mr. Zhiyu Li is a Ph. D. candidate of Institute of Turbomachinery of Xi'an Jiaotong University in China.
His research topics is the fluid dynamics and heat transfer performance, as well as film cooling of turbomachinery.

Authors:

Zhiyu Li Institute of Turbomachinery, Xi'an Jiaotong University
Kaiyuan Zhang Institute of Turbomachinery, Xi'an Jiaotong University
Zhigang Li Institute of Turbomachinery, Xi'an Jiaotong University
Jun Li Institute of Turbomachinery, Xi'an Jiaotong University