User:JoanCasta23/sandbox

Introduction
Combustion is a chemical process that involves releasing energy from a fuel and air mixture. In case of hydrogen combustion, liquid or gaseous hydrogen is burned in a modified gas-turbine engine to generate push. This process is like traditional internal combustion, except in this case hydrogen replaces fossil fuel. This is why hydrogen combustion is currently a good candidate for alternative fuel.

Hydrogen has many properties that make it suitable for combustion, including the following:


 * Wide flammability range: the hydrogen combustion can take place via a large range of fuel-air mixtures. Actually, hydrogen can run on a “poor” mixture, which means that the amount of fuel needed is less than the amount needed for combustion with a given amount of air. This results in greater fuel economy and a lower temperature of combustion, that reduces the number of pollutants emitted.
 * High auto-ignition temperature: hydrogen’s high auto-ignition temperature enables higher compression ratios in a hydrogen engine compared to a hydrocarbon engine. This results in greater thermal efficiency and less energy loss during combustion.

The problem takes place in the cost and difficulty of hydrogen’s production. It should be noted that, even if hydrogen is one of the most abundant elements on Earth, the obtention is quite difficult. Hydrogen is generated from other substances that contain it, including water, coal and natural gas. The ideal way to produce it would be to obtain it directly from water carrying out an electrolysis, which consists of the decomposition of water molecules in oxygen and hydrogen. However, this can be a costly process that requires a lot of energy.