ENGINE & TURBINE TECHNOLOGY
SECURING THE FUTURE OF GAS TURBINES
Jörg Meyer describes how a compact exhaust gas system has been developed for a test rig
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combustion process, with the long-term aim of developing a CO2
associated with climate change. Over recent years, gas turbine manufacturers have been working to reduce CO2
hether mounted on aircraft or in stationary applications, gas turbines are not immune to the demand for CO2
-neutral drives
emissions from the -neutral thermal
turbomachine. Accordingly, development work on machines like these focuses on the combustion chamber. Tat in turn makes
high-pressure combustion chamber test rigs a valuable resource for experimental investigations. Tese test rigs need to be designed with two particular considerations in mind. Firstly, they have to give users the opportunity to validate pressure and exhaust gas temperature values under full-load conditions. Secondly, they must satisfy statutory requirements for acoustic emissions at the installation site. Tis is where the test rig’s exhaust system plays a crucial role.
AN UNTENABLE SITUATION Te German Aerospace Center (DLR) operates a number of high-pressure combustion chamber test rigs for various application scenarios. Due to increased demands on gas turbine design, the existing exhaust system of high-pressure combustion chamber test rig 2 (HBK 2) was no longer able to withstand the mechanical and thermal stresses associated with the exhaust flow. After each test cycle, stress fractures would be found in the guide vanes of the exhaust system, requiring extensive repairs to enable the next-generation technology to be validated in time. On both technical and financial grounds, the situation was simply untenable in the long term. In 2019, the DLR took the decision
to rebuild the exhaust system of HBK 2. DLR awarded the contract for developing and installing the new system, complete with silencer and flow redirection mechanism, to G+H Schallschutz. Te
Outside of the DLR’s HBK 2 test rig
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