06. February 2020
The compressor for supplying air to a fuel cell stack is a critical component in the balance of plant (BoP), especially for mobile applications. The main requirements of the compressor are the performance concerning pressure ratio, mass flow and efficiency, while having a minimal size and weight. The turbo compressor technology is ideally suited to meet these requirements.
24. July 2019
Compressor applications frequently require a high demand for tightness performance of the turbo compressor. For many reasons this feature is important to minimize and avoid risks of health, environment, fire, failure and cost. Since 100% system tightness – even using O-rings is unfeasible, the method to achieve the required minimal system tightness level is crucial. In general, the tightness of turbo compressors is determined through the measurement of the leakage rate.
08. November 2018
Airplanes play an important role in today’s worldwide transportation system. To handle the growing weight of freight and number of passengers, the plane size must increase while existing runways often cannot be extended. At the same time, there are increasing demands for reducing noise and increasing efficiency due to CO2 emissions and global warming. Prof. Zha and his team from the University of Miami conduct research in the area of active flow control concepts for ultra-high lift coefficient, the so-called Super-Lift condition, by energizing the boundary layer of airfoils. This principle allows for short take-off and landings, and enables drag reduction during cruise and, therefore, lower fuel consumption during long distance flights. The key technology providing this Super-Lift is an ultra-compact turbo compressor, which Celeroton has realized prototypes for wind tunnel testing.
07. November 2018
For efficient production and for avoiding long transport distances, one of Celeroton’s customer, operates gas separation plants directly at its clients’ sites. These plants typically use turbo compressors with several 100 kW electrical power. To optimize these plants and to improve gas separation methods, pilot plants are operated in a laboratory environment. In these pilot plants, miniaturized turbo compressors with air bearings are needed in order to obtain comparable results to the large scale production plants. Two Celeroton turbo compressors with air bearings are connected in series to achieve the required pressure levels.
06. February 2018
A number of emerging applications ask for a dramatically improved performance of femtosecond laser systems concerning pulse energy. Due to limitations in the amplifier medium, further improvements within the laser source are increasingly challenging. Stacking of multiple amplified pulses via methods such as Stack-and-Dump seems to be a possible solution. To extract these high-energy pulses, a fast, efficient, minimal-invasive switch is necessary. State of the art switches make use of electro-optic or acousto-optic effects but their transmissive nature limits the achievable energy due to nonlinear effects or overheating. Finding a suitable switch remains a puzzling task and only recently a promising new approach employing small fast rotating mirrors as a dumping device in order to extract energy from the cavity was theoretically proposed and thoroughly described. Such fast rotating mirrors could be driven by the magnetic bearing motors such as the CM-AMB-400. As first step towards such an optical switch based on the CM-AMB-400, measurements of velocity and pointing stability have been undertaken and are outlined in the following article.