KIT Researchers Set New Compressorless Gas Turbine Runtime Record

Karlsruhe Institute of Technology (KIT) researchers have established a new record runtime for a compressorless gas turbine, operating it for 303 seconds. This duration surpasses NASA's previous record of 250 seconds. The development marks progress for hydrogen-based energy supply, as hydrogen can be generated from renewable sources. Earlier in the year, the team successfully generated electricity using a hydrogen gas turbine without a mechanical compressor. The gas turbine is scheduled for presentation at the Hannover Messe from April 20 to 24, 2026.

Advancing Hydrogen Energy for a Fossil-Free Future

Previous tests of such combustion systems typically lasted for brief periods due to the risk of melting combustion chambers. The KIT team extended this operational time to over five minutes.

Professor Daniel Banuti, Director of the Institute of Thermal Energy Technology and Safety (ITES), stated that this represents a significant advancement for efficient and flexible hydrogen energy in developing a fossil-free energy system.

A key benefit of this technology is the elimination of energy expenditure for air compression before ignition. Banuti explained that conventional gas turbines allocate approximately 50 percent of their power to compress air for efficient combustion, which then becomes unavailable for electricity generation.

The Innovation: Pressure-Gain Combustion

The compressorless gas turbine utilizes pressure-gain combustion. This method differs from conventional gas turbines, which use a significant portion of their output for air compression. The new system generates high pressure via detonation waves within the combustion chamber, originating from fluid-mechanical instability, thereby eliminating the need for mechanical compressors. This process contributes to energy savings, a reduction in moving parts, and improved efficiency.

Hydrogen's Role and Future Applications

While not exclusive to hydrogen, the technology benefits from hydrogen's rapid reaction properties, which facilitate stable pressure increases. This characteristic supports the development of lighter, more cost-effective, and highly efficient turbines for power generation and potential future use in aviation.

Pioneering Electricity Generation

Integrating a turbine with the combustion chamber to generate electricity presented a technical challenge. Banuti indicated that the rapid and intense combustion within the chamber complicates stable energy transfer to the turbine. The team reported being the first to successfully operate such a turbine and produce electricity from it.

Upcoming Presentation: Hannover Messe 2026

The innovative gas turbine will be showcased by the researchers at the Hannover Messe from April 20 to 24, 2026, at the KIT booth.