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Cooling holes with different structures effects on coolant cross flow and heat transfer at the outlet of the combustion chamber

Kianpour Ehsan, Sidik Nor Azwadi Che

Journal of Mechanical and Energy Engineering

2021

Vol. 5, No 2

141--148

The major effects of cylindrical and row trenched cooling holes with angles of 𝛼 = 30°, 𝛽 = 0°, 𝛼 = 40°, 𝛽 = 0° and 𝛼 = 50°, 𝛽 = 0° at BR=3.18 on the effectiveness of film cooling near the combustor end wall surface is an important subject to study in detail. In the current study, researchers used a FLUENT package 16/11 to simulate a 3-D model of a Pratt and Whitney gas turbine engine. In this research, RNG turbulence model K-ε model was used to analyze the flow behavior on the passage ways of internal cooling. In the combustor simulator, the dilution jets and cooling flow staggered in the streamwise direction and aligned in the spanwise direction as well. In comparison with the baseline case of cooling holes, the application of trenched hole near the end wall surface increased the effectiveness of film cooling up to 100% for different trench cases.

A detailed study of row-trenched holes at the combustor exit on film-cooling effectiveness

Kianpour Ehsan, Sidik Nor Azwadi Che

Mechanics and Mechanical Engineering

2019

Vol. 23, nr 1

246--252

To analyse the effects of cylindrical- and rowtrenched cooling holes with an alignment angle of 90 degrees on the film-cooling effectiveness near the combustor end wall surface at a blowing ratio of 3.18, the current research was done. This research included a 3D representation of a Pratt and Whitney gas turbine engine, which was simulated and analysed with a commercial finite volume package Fluent 6.2.26. The analysiswas done with Reynolds-averaged Navier-Stokes turbulence model on internal cooling passages. This combustor simulator was combined with the interaction of two rows of dilution jets, which were staggered in the streamwise direction and aligned in the spanwise direction. In comparison with the baseline case of cooling holes, using row-trenched hole near the end wall surface increased the film-cooling effectiveness 44% in average.