Alternative Combustion Systems for Piston Engines Involving Homogeneous Charge Compression Ignition Concepts - A Review of Studies Using Methanol, Gasoline and Diesel Fuel

Dilution Effects on the Controlled Auto-Ignition (CAI) Combustion of Hydrocarbon and Alcohol Fuels

“…This could be a result of favourable inlet charge temperature / compression ratio conditions, but equally it could arise from Methanol's different oxidation kinetics. In any case, this trend can explain why previous studies [5,7,22,23] have shown Methanol to outperform Gasoline in systems that rely on exhaust residuals to promote auto-ignition. In other words, the combinations of exhaust gas dilution and charge temperature that facilitate auto-ignition are relatively fewer for Gasoline, compared to Methanol, giving Methanol a wider operating range.…”

“…The alcohols included are Methanol and Ethanol, since they are already in use for automotive applications, and previous studies [5,7,22,23] have shown alcohols to be superior to Gasoline for CAI operation. A PRF blend of 95% Isooctane and 5% Heptane (95 RON) is included for comparison with Gasoline.…”

“…Honda ARC 250), it is a main objective of current research to transfer the technology to 4-Stroke engines to eliminate problems associated with the gas exchange process of 2-Stroke engines that result in higher emissions. Many studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] have shown that the known strategies for achieving this type of combustion in any engine can lead to severe restrictions on the load and/or speed range attainable, for a variety of reasons. Development of practical systems [15,18,20] appears to be focussed on hybridisation of CAI technology with those already existing (SI, CI, Electric) to provide a complete power plant retaining all of the benefits of CAI combustion (low emissions, high efficiency) without the drawbacks (limited speed and load range).…”

Recent development of biodiesel combustion strategies and modelling for compression ignition engines

“…The first stage is a low temperature kinetic reaction and the second stage is the main heat release regime [97]. This process is controlled by the auto ignition due to low temperature chemistry and the main heat release is dominated by CO oxidation [85].…”

Hydrogen-Assisted IC Engine Combustion as a Route to Hydrogen Implementation

“…The time delay between the first and the main heat release is attributed to the negative temperature coefficient regime of the reactions [138,139]. An example of the combustion parameter diagram is shown below in Figure 2.13 [140].…”