Though, hydrogen cannot be used as the solitary fuel in a CI engine, because the compression temperature is not enough to kick off combustion due to its elevated self-ignition temperature
This research applied finite time thermodynamic analysis to characterize the effects of parameters like ignition advance, fuel ratio, temperature of the internal cylinder wall to obtain a description of the temperatures at the ignition point and carry out an optimization process to get them below the self-ignition temperature of the air-fuel mixture.
The previous temperature was compared to the self-ignition temperature of the air-fuel mixture, which for our case is 579 [degrees]C (852 K) with an absolute fixed measure of 0.05 .
Diesel and kerosene fuels have different physical and chemical properties such as chemical structures, viscosity, heating value, self-ignition temperature, boiling temperature, adiabatic flame temperature, difference contents of paraffin, aromatic, olefin, naphthalene, and saturates hydrocarbon as listed in Table 1.
Test properties Test method Chemical formula Cetane number ASTM D613 Flash point ([degrees]C) ASTM D93 Pour point ([degrees]C) ASTM D97 Boiling point ([degrees]C) Oil weathering system Self-ignition temperature ([degrees]C) ASMT D97 Distillation temp.
In order to investigate the flammable properties of seven analyzed polyester materials, the following parameters were determined: combustion heat, the ignition temperature of volatile products of thermal decomposition, self-ignition temperature and oxygen indexes of the studied polyesters.
The flammable properties of the studied polyester material both modified and unmodified with flame retardants, were analyzed based on the obtained ignition temperatures of thermal decomposition products, self-ignition temperatures, oxygen indexes and the heat of combustion.
More specifically, the air is first compressed, then fuel is injected into the cylinder as fuel contacts the heated air, it vaporizes and finally begins to burn as the self-ignition temperature
* Self-Ignition temperature
for ethanol and 'aquanol' (70% ethanol and 30% water) is greater than that of petrol.
If the heat reaches the self-ignition temperature
of the substance, it burns.
While using hydrogen in a compression ignition (CI) engine, the compression temperature is not enough to initiate the combustion due to its higher self-ignition temperature
. Hence a CI engine requires an ignition source for using hydrogen However, hydrogen can be used in a CI engine in the dual fuel mode with diesel acting as an ignition source for the hydrogen fuel in addition to being the main fuel.