With VariJektor, we offer high-performance ejector solutions optimized for gases over wide operating and load conditions. Our portfolio includes standard ejectors, patented variable ejectors (VariJektor), as well as comprehensive services.

Featured Products and Services

Product 1: Active VariJektor

Core Features:

  • Electrically actuated mixing chamber for real-time adjustment and identifying optimal performance

  • Interchangeable nozzle sets to meet a wide range of boundary conditions und customer requests

  • Maximum recirculation across the full load range

Use Cases:

  • VariJektor as a Test Bench System: enables rapid evaluation of customer requests

  • Operational Deployment: Delivers peak performance in application scenario

Customer Benefits:

  • Rapid response: New ejector configurations and customer requests ready within 24 hours

  • Cost efficiency: Reduced testing time and lower hardware development costs

Product 2: Passive VariJektor

Core Features:

  • Passive spring mechanism sets the optimal mixing chamber diameter

  • High-efficiency recirculation tailored to specific operating scenarios

  • Energy savings through optimized passive control

Use Cases:

  • Series Integration: Fine-tuned performance for predefined boundary conditions

  • Application Areas: Automotive, process engineering, HVAC, fuel cells, and more

Customer Benefits:

  • Enabling recirculation performance request for specific application

  • Energy saving for specific application, f.i. hydrogen savings in PEM fuel cell application

Services - TaaS - EaaS

TaaS – Testing as a Service

Let your product or concept be tested on our advanced ejector test bench.

  • Access to our high-performance test infrastructure for validation and benchmarking

  • Real-time evaluation of ejector performance under your specific boundary conditions

  • Data-driven insights to improve your product

EaaS – Engineering as a Service

We support your development with expert design and simulation services.

  • Detailed ejector geometry design based on your application requirements

  • CFD-supported performance optimization and system integration support

  • Transfer of application-specific know-how and design expertise to your team

Schedule your appointment

Turn your vision into reality with our innovative products and expert services. Contact us today to connect with our specialists and take your project to the next level.

office@varijektor.com

A selection of images on this website has been obtained from publicly available and previously published sources. We acknowledge and respect the rights of the original creators.

Specifically, the following publications are named:

  1. Singer G, Gappmayer G, Macherhammer M, Pertl P, Trattner A. A development toolchain for a pulsed injector-ejector unit for PEM fuel cell applications. International Journal of Hydrogen Energy 2022;47(56):23818–32. https://doi.org/10.1016/j.ijhydene.2022.05.177.

  2. Singer G, Köll R, Aichhorn L, Pertl P, Trattner A. Utilizing hydrogen pressure energy by expansion machines – PEM fuel cells in mobile and other potential applications. Applied Energy 2023;343(4):121056. https://doi.org/10.1016/j.apenergy.2023.121056.

  3. Singer G, Köll R, Pertl P, Trattner A. Development of an ejector for passive hydrogen recirculation in PEM fuel cell systems by applying 2D CFD simulation. Automotive and Engine Technology 2023;8(3):211–26. https://doi.org/10.1007/s41104-023-00133-z.

  4. Singer G, Pinsker R, Stelzer M, Aggarwal M, Pertl P, Trattner A. Ejector validation in proton exchange membrane fuel cells: A comparison of turbulence models in computational fluid dynamics (CFD) with experiment. International Journal of Hydrogen Energy 61 (2024) 1405–1416. https://doi.org/10.1016/j.ijhydene.2024.02.365

  5. Singer G, Rabensteiner M, Pinsker R, Aggarwal M, Köll R, Pertl P, Trattner A. Passive Anode Recirculation in PEM Fuel Cell Systems: Enhancing Efficiency and Performance. 45th International Vienna Motor Symposium. https://doi.org/10.62626/ob5b-45kd

  6. Singer G, Pertl P, Trattner A. “Experiments on maximizing hydrogen utilization and efficiency in a PEM fuel cell system”. International Journal of Hydrogen Energy 106 (2025) 1158–1166. https://doi.org/10.1016/j.ijhydene.2025.02.036

  7. Jiangkun Zou, Jing Li, Gerald Singer, Li Zhang, Pingwen Ming. “Numerical study of water droplets in hydrogen recirculation ejectors for proton exchange membrane fuel cells”. Applied Thermal Engineering 261 (2025) 125084. https://doi.org/10.1016/j.applthermaleng.2024.125084

Sources