A new efficient combustion method for ICEs 2020-01-1314
Current methods for combustion in Internal Combustion Engines (ICEs) are: Spark Ignition (SI), Compression Ignition (CI) and Homogeneous Charge Compression Ignition (HCCI). Each of these combustion methods has well known limitations for efficiency and clean exhaust. This paper presents a new method of combustion, called Entry Ignition (EI), that overcomes these limitations. EI burns a homogeneous fuel air mixture at constant pressure with combustion occurring at the inlet where the unburned mixture flows into the combustion chamber. Combustion results from the unburned mixture mixing with the much hotter already burned gases already in the combustion chamber. EI can operate in a conventional piston-type engine, with the only major change being in the valving. EI’s efficiency gain results from the following. Firstly, EI is not subject to “knocking” and so can operate at CI level compression ratios or higher. Secondly, EI allows lean burn, which improves efficiency for basic thermodynamic reasons. Thirdly, an engine that using EI can fully expand the combustion gases (Brayton cycle), and finally, EI has reduced heat loss relative to the other combustion methods. These efficiency boosting effects combine independently to give a thermal efficiency of around 55%. Because both EI and SI burn a homogeneous mixture, they do not produce significant particulate emissions, and EI can burn sufficiently lean that NOx production is kinetically suppressed, so that no exhaust cleanup is not necessary.