Diesel - An Overview

Diesel is a liquid fuel used in diesel automobile engines. Diesel’s fuel ignition takes place, without spark, due to compression of the inlet air mixture and then injection of fuel.
Diesel engines have higher thermodynamic and therefore high fuel efficiencies. Diesel engines are usually run at part-load; as the air supply is not throttled as in a petrol engine, their efficiency is very high.

The most common type of diesel fuel is a particular fractional distillate of petroleum l, but alternatives, such as biodiesel, biomass to liquid (BTL) or gas to liquid (GTL) diesel, are also being developed and adopted increasingly.

Petroleum-derived diesel is usually referred to as petrodiesel. Ultra-low-sulfur diesel (ULSD) is a specific standard for diesel fuel that has substantially low sulfur contents.

The most common measure of diesel fuel quality is the cetane number. It is a measure of the delay of ignition of a diesel fuel.