Aerothermal Characteristics of Trailing Edge Region Film Cooling on a Nozzle Guide Vane

Gudla, B.; Pujari, A. K.

doi:10.47176/jafm.18.12.3486

Aerothermal Characteristics of Trailing Edge Region Film Cooling on a Nozzle Guide Vane

Document Type : Regular Article

Authors

Mechanical engineering Department, Indian Institute of Petroleum and Energy, Visakhapatnam, Andhra Pradesh, 530003, India

10.47176/jafm.18.12.3486

Abstract

Maintaining the trailing edge of the first stage high-pressure nozzle guide vane (NGV) in high-temperature regions (̴ 2200K) is always a challenging task compared to the other locations. This paper investigates the aero-thermal characteristics of a nozzle guide vane (NGV) with an innovative film cooling configuration to optimize cooling performance in high-temperature environments. The study examines the effects of varying blowing ratios (0.69, 1.07, 1.67, and 2.06) on total pressure losses and cooling effectiveness by replacing traditional trailing edge ejection with two rows of film-cooling holes in the post-throat region. Computational analysis using ANSYS Fluent revealed that lower blowing ratios maintain better film attachment and increase total pressure losses with an increase in the blowing ratio up to 1.67 and a drop in the losses at higher blowing ratios (2.06) due to the increasing coolant jet momentum, better mixing with the mainstream due to jet lift-off. The 20% decrease in the total pressure losses using the novel film configuration compared to the trailing edge ejection signifies the study. These findings highlight the importance of optimizing blowing ratios and hole configurations to achieve efficient cooling without compromising aerodynamic performance, providing valuable insights for designing advanced cooling systems in gas turbine engines.

Keywords

Main Subjects

Turbomachinary

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