https://simpleflying.com/how-does-a-hyd ... gine-work/
Malo sam, surfala o transportu istog ( naravno, godinama se koristi kao gorivo svemirskih letjelica)
https://www.lr.org/en/insights/articles ... portation/
Dio o opasnostima korištenja istog je posebno važan i zanimljiv:
Many studies have been conducted evaluating specific physical aspects of different fuels and
comparing them to hydrogen. Those studies show that certain characteristics of hydrogen make it
safer as a fuel than kerosene, while other characteristics make it more dangerous.
Hydrogen Kerosene
Auto-ignition temperature ✓
Buoyancy ✓
Diffusivity ✓
Spill Hazard ✓
Burning time ✓
Lower Flammability limit ✓
Flammability range ✓
Leakage detection ✓
Leakage Avoidance ✓
Flame detection ✓
Minimum ignition energy ✓
For instance, the auto-ignition temperature of hydrogen is considerably higher than that of kerosene
(550 °C vs 220 °C), also hydrogen is about 14 times lighter than air, so if spilled it quickly diffuses and
the vapors rises and disperses, rather than accumulating at ground-level [17]. Since hydrogen is a gas
that is already present in the atmosphere, a spillage would not represent an environmental hazard in
the same way compared to a fossil fuel spill. The minimum ignition energy of hydrogen, however, is
considerably lower than that of other carbon-based fuels, therefore, a weaker spark can cause ignition.
Moreover, the flammability range is wider meaning the concentrations in the air required to have a fire
are wider for hydrogen (4-76%) than for kerosene (1.4-7.6%) [3]. On the other hand, the lower
flammability limit is higher for hydrogen than kerosene (4% vs 1.4%). This means that if the
concentration of kerosene in air is more than 1.4%, a fire can occur, however this number is 3 times
larger for hydrogen. The hydrogen flame is invisible, and the gas is odorless making it difficult to detect
leaks or to fight a hydrogen fire if it that cannot be seen. Since H2 is such a small molecule, leaking
through cracks or pores is a possibility if the tank is not properly insulated, and this is associated to a
higher risk due to the reasons outlined before, demonstrating that proper insulation is fundamental.
The architecture of aircraft would have to change considerably to adapt the larger tanks required for
hydrogen flight. New aircraft designs would be required and may allow ideas such as blended wing
body aircraft. This may produce some aerodynamic advantages, however a downside could be the
time involved in certification of radical new aircraft, along with potentially substantial costs to redesign
and certify new aircraft and operational infrastructure.
Ma ovo je preskupo za generalnu upotrebu.
@Seawolf
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