Oxygen injection for combustion control for compression ignition closed cycle hydrogen engines

Pochari hydrogen has invented a revolutionary new type of combustion system. Pochari hydrogen believes the hydrogen compression ignition engine is more than feasible. Despite little active research in this field, due to the overwhelming interest in fuel cells or batteries, previous research has found hydrogen compression ignition to be nearly impossible. A compression ratio of 20:1 provides air temperatures up to 450 Celsius, significantly below the 600 Celsius required for hydrogen. Pochari hydrogen has solved this problem with its closed-cycle system, by using Argon, with the same compression ratio, 750 Celsius, providing a sufficient 150-degree margin above the autoignition temperature of hydrogen without needing to increase the compression ratio, allowing standard diesel engines to operate on hydrogen. Despite the sufficient autoignition temperature, there is still one challenge that remains in the way of hydrogen compression ignition. This challenge is rapid pressure rise due to hydrogen’s 7x higher laminar flame velocity. This can be an advantage, since less heat is lost through the cylinder wall, but it can pose challenges to engine design. Modern diesel engines are designed for 2000 psi peak cylinder pressure, with hydrogen this is significantly increased. Another issue is the very low MIE (minimum ignition energy), hydrogen may combust spontaneously prior to TDC, or even in the intake manifold, resulting in sporadic uncontrolled combustion which may cause serious performance and reliability issues. Pochari Hydrogen’s invention solves this problem altogether. Our engine uses an argon- hydrogen mixture in the intake, during the power stroke, a special injector sprays a specific amount of oxygen to fully combustion the hydrogen stoichiometrically, but injecting oxygen gradually to allow smooth combustion. Until oxygen is injected, no combustion can occur, even above its autoignition temperature, the hydrogen will not combust, due to the absence of an oxidizer. In conclusion, this technology utilizes oxygen to achieve and maintain precise combustion control, allowing for perfect stoichiometric combustion of hydrogen and maintaining just enough oxidizer at any given time to achieve smooth and gradual combustion, avoiding a sudden detonation and resultant surge in cylinder pressure inherent to hydrogen combustion.

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