Session: 33-02 Deposition and erosion in hot engine components

Paper Number: 153353

Comprehensive Assessment of Internal Deposition on an Impingement Cooling Circuit at Engine Relevant Temperatures 

A new deposition cooling facility was designed and constructed to examine the time-evolution of dust deposition and its effect on the cooling effectiveness of internal cooling circuits typical of gas turbine hot sections. The facility utilizes representative gas turbine engine cooling geometries and operates at relevant coolant and hot gas flow temperatures (650K and 1300K respectively). A combustion chamber is used to create a high speed (180m/s) 2cm diameter jet that impinges at a 26° angle (from the horizontal) onto a pre-oxidized flat plate made from a nickel-based alloy. The backside of this plate is cooled by an array of 357 0.5mm diameter impingement cooling jets with a 1.03 pressure ratio relative to the hot jet discharge pressure. An infrared camera is used to record the surface temperature of the flat plate prior to and as airborne dust is delivered through the cooling circuit. Prior to injecting dust, a pre-deposition assessment is conducted at target conditions to measure the cooling effectiveness of the circuit at different pressure ratios (1.02-1.05 in increments of 0.01). The dust delivered to the test article is 0-5micron Arizona Road Dust. Deposit evolution and cooling effectiveness trends were observed by performing successive tests with varying delivery period while maintaining constant dust loading (concentration). Observable patterns in the deposit behavior corroborate quantitative measurements of cooling efficiencies measured by the IR camera. A companion CFD study using the OSU Deposition Model provides additional insights into the evolution of deposit blockage and its effects on cooling performance.

Presenting Author: Sepehr Hosseinkhani The Ohio State University

Presenting Author Biography: Sepehr Hosseinkhani has been a graduate research associate at The Ohio State University pursuing a MS in Aerospace Engineering since 2023, working at the Aerospace Research Center where he researches particulate deposition in gas turbine engines.

Authors:

Sepehr Hosseinkhani The Ohio State University
Nick Jannot The Ohio State University
Jeffrey Bons The Ohio State University
Ryan Lundgreen Pratt & Whitney