The research aircraft Antares DLR H2 is the world’s first bootable, airplane pilot with fuel cell propulsion. It is based substantially on the last few years built boat Antares 20E. In two additional external load containers will be the fuel cell system and the hydrogen tanks under the wings for increased appropriate. In further steps could the performance data of the plane with up to four external load containers and more advanced fuel cells still significantly increased.
Developed and built the high-flying testbed project partners from Long Aviation in Zweibruecken. As the primary source of energy for propulsion is one of the DLR Institute for Technical Thermodynamics specially provided fuel cell system. This system is nearly identical to that used in aircraft fuel supply system for board and provides the electrical energy for the Long Aviation developed powertrain, from the power electronics, motor and propeller exists. The use of a highly efficient fuel cell (efficiency up to 52% electrically) with the hydrogen fuel makes driving this airplane CO2 released. The waste product is clean water.
It is expected that the pairing of the fuel cell with a very quiet and powerful electric propulsion small plane in comparison with piston-driven engines set new standards in the fitness level requires. The project impresses by bringing together interdisciplinary activities. To a very economical flight to allow the entire aircraft is technically optimized flow. The goal is turbulent air currents in all areas to be avoided.
Long Aviation, the company is making a long-standing experience with. The integration of the experimental vessel was both aerodynamically aeroelastic both a challenge by the solid experience of the Institute for Aeroelasticity of the German Aerospace Center, an optimal placement of the containers can be achieved. This is the dynamics of the airplane is not affected. The additional air resistance on the Antares 20E model series are less than 15% and with a potential additional burden of more than 200kg.
When the coupling of the fuel cell powertrain system with the new routes were also begun. The fuel cell system was designed so that it directly with the engine control unit can be connected. The components and saves costs and increases efficiency. Therefore, both the Institute for vehicle concepts of the DLR as well as the Bern University of Applied Sciences Biel and the Long Aviation an important contribution. A subsequent hybridization with a lithium-polymer battery will power the aircraft continue to improve. The result is a high-tech makers of a variety of architectures of fuel cell systems can absorb. These can then be luftfahrtrelevanten conditions such as pressure, temperature, acceleration and vibration tested.
For the first flight at the end of this year, a fuel cell system in cooperation with the firm BASF Fuel Cell GmbH (electrolyte + electrodes) and Serenergy A / S (Stack Subsystem) for the airline upgraded. That was at the Institute of Technical Thermodynamics alongside overall system architecture design and build a whole range of temperature and pressure measurements.
With a specially designed control architecture Algorithm shows this is a very good weight / performance ratio, an important criterion for the airline. Upon completion of the first tests, which are aimed at a maximum altitude and thus a minimal negative pressure to reach the fuel cell system developed for maximum efficiency in converting fuel energy into electrical energy to guarantee. Now the entire fuel cell system used and the hydrogen tank weigh about 100 kilograms. Thus, only half of the additional burden exploited. This offers a high potential for the aircraft for possible flights record (height, width, etc.) compartment.
To make a comparison to be able to stand further fuel cell systems and architectures prepared to your airworthiness to be investigated.
20m/65 span, 6p.d
Wing area 12.6 m2/135ft2
The main body length of 7.4 m/24, 3f
POD length 2,87 m / 9.43 ft
POD diameter of 0.6 m / 1.97 ft
Curb weight around 460kg/1014 lb
Weight around 60kg fuel cell system
BZ operating system in flight <-45 ° C to 40 ° C
Maximum weight of 750kg DLR H2 (> 900kg in 4 POD version)
Range> 750km (> 2000km in 4 POD version)
Max fuel cell power system around 25kW (up to 45kW in 4 POD version)
Continuous power fuel cell system> 20kW
Max attainable height>> 3000m />> 10000ft
Max climb speed (560kg)> 2.5 m / s (with 25kW)
DC / DC Brushless
Maximum power> 42 kW
Rated 1500 1/min
Maximum speed 1,700 1/min
Max torque 216 Nm
Total Efficiency 90%