Experimental Study of Impingement Effusion Cooled Double-Wall Combustor Liners: Aerodynamic Analysis with Stereo-PIV

Thomas Jackowski, Maximilian Elfner, Hans-Jörg Bauer, Katharina Stichling and Marco Hahn
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Thomas Jackowski: Institute of Thermal Turbomachinery (ITS), Karlsruhe Institute of Technology (KIT), 76137 Karlsruhe, Germany
Maximilian Elfner: Institute of Thermal Turbomachinery (ITS), Karlsruhe Institute of Technology (KIT), 76137 Karlsruhe, Germany
Hans-Jörg Bauer: Institute of Thermal Turbomachinery (ITS), Karlsruhe Institute of Technology (KIT), 76137 Karlsruhe, Germany
Katharina Stichling: Institute of Thermal Turbomachinery (ITS), Karlsruhe Institute of Technology (KIT), 76137 Karlsruhe, Germany
Marco Hahn: Institute of Thermal Turbomachinery (ITS), Karlsruhe Institute of Technology (KIT), 76137 Karlsruhe, Germany

Energies, 2021, vol. 14, issue 19, 1-23

Abstract: A new experimental study is presented for a combustor with a double-wall cooling design. The inner wall at the hot gas side features effusion cooling with 7-7-7 laidback fan-shaped holes, and the outer wall at the cold side features an impingement hole pattern with circular holes. Data are acquired to asses the thermal and aerodynamic behavior of the setup, using a new, scaled up, engine similar test rig. Similarity includes Reynolds, Nusselt and Biot numbers for hot gas and coolant flow. Different geometrical setups are studied by varying the cavity height between the two walls and the relative alignment of the two hole patterns at two different impingement Reynolds numbers. This article focuses on the aerodynamic performance of the setup. Instationary flow data are acquired, using a high speed stereo PIV setup. For each geometrical configuration, approximately 20 planes are recorded with a data rate of 1000 Hz by traversing the flow region of interest in the cavity between the two specimen. This fine resolution allows the reconstruction of 3D flow fields for the mean data values and an extensive analysis of transient phenomena at each plane. Time averaged data and jet-center plane transient data are presented in detail. The results show a complex flow field with a hexagonal vortex pattern in the cavity, which is mainly influenced by the cavity height and the relative alignment of the two walls. The jet Reynolds number shows small influence when analyzing normalized data. Small cavity heights show a less developed flow field with less stable vortex systems. The alignment shows a similar influence on vortex system stability, with the aligned case performing better. Additionally, statistical analysis of the jet flow and frequency domain analysis of the jet and the effusion flow are presented, showing the damping capability of the cavity, especially at increased cavity heights, and a residual low frequency pulsation of the effusion cooling inflow.

Keywords: combustor cooling; effusion impingement; PIV (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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