This paper presents a large eddy simulation study of n-heptane spray combustion in an low temperature reform (LTR) gas environment constant volume chamber, under conditions relevant to single-fuel reactivity controlled compression ignition (RCCI) engines. The LTR is made up partially oxidized intermediate species from rich n-heptane/air mixture external reformer. It found that higher results lo...

Abstract This study presents the optimization of intake manifold and optimized flow rate acetylene gas which acts as a low reactivity fuel to achieve superior performance emission characteristics used in Reactivity controlled compression ignition (RCCI) engine. Intake is one engine components are an important factor determining quality combustion. A very recent evolution RCCI using temperature ...

Abstract This paper examines the potential of using ammonia (NH $$_3$$ 3 ) as a primary fuel in heavy-duty engines for decarbonization, with some challenges yet to be addressed. It presents numerical study Reactivity Controlled Compression Ignition engine, where pilot diese...

Reactivity controlled compression ignition (RCCI) combustion showed great advantages in terms of engine-out NOx and soot emissions reduction. However, HC CO are larger than with conventional diesel combustion. Commercial oxidation catalysts can deal the amount generated during RCCI only at warm conditions, thus limiting implementation this concept vehicles hybrid applications due to large engin...

The paper describes correlation between combustion knock intensity and combustion rate calculated as the heat release rate from combustion pressure traces of a hydrogen fuelled spark ignited engine. Unlike a gasoline spark ignited (SI) engine, the hydrogen fuelled engine can easily generate knock during combustion at working conditions similar to a gasoline engine. However, the hydrogen knock d...

Combustion in homogeneous charge compression ignition (HCCI) engine is controlled auto ignition of well-mixed fuel, air and residual gas. Since onset of HCCI combustion depends on the auto ignition of fuel/air mixture, there is no direct control on the start of combustion process. Therefore, HCCI combustion becomes unstable rather easily especially at lower and higher engine load. Charge strati...

Advanced combustion modes such as Controlled Auto-Ignition or Homogeneous Charge Compression Ignition have been under much attention due to their ability to reduce both emissions and fuel consumption. Thus, this paper aims at demonstrating the achievement of Controlled Auto-Ignition combustion on a standard 4-cylinder gasoline engine with negative valve overlap (NVO) and analyzing its performan...

In order to directly control the premixed combustion phasing, a Jet Controlled Compression Ignition (JCCI) for diesel premixed compression ignition systems is investigated. Experiments were conducted on a single cylinder natural aspirated diesel engine without EGR at 3000 rpm. Numerical models were validated by load sweep experiments at fixed spark timing. Detailed combustion characteristics we...