Development of heat exchange reactor for preparation of air-fuel mixture in spark ignition engine

Abstract

Hazardous components, such as NOx, CO and HC, in the spark ignition engine exhaust gases may cause serious consequences for human health. The hazardous components in the engine exhaust gases and thermal losses resulting from the engine work can be reduced to a great extent. Energy is released from the system in the form of heat, which use in preparation of the air-fuel mixture has a significant effect on the combustion process. The aim of the article is to, firstly, give an overview of the design and development processes of a heat exchange reactor on a four stroke spark ignition engine, and, secondly, to analyse the effect of a heat exchanger on the engine output parameters. In this research, a heat exchanger is fitted on a four stroke internal combustion engine-generator. The prototype of the heat exchanger is designed and tested. The influence of the heat exchanger on the engine work parameters is outlined and the problems are described and discussed. The results of prototyping indicate that a heat exchange reactor on a four stroke engine reduces harmful emissions of the test engine. More precisely, CO emissions decrease, when preheated air-fuel mixture is formed and directed into the spark ignition engine. The existing calculation models of the heat exchanger give inaccurate results of heat exchanger parameters. Based on the abovementioned, effective engine work with a heat exchanger needs further development.

Developing and testing air-fuel mixture heating system for internal combustion engine

“…At higher engine loads, the natutally aspirated engine with HEX can no longer operate. The problem with the HEX fuel supply system is not always with the air-fuel mixture: sometimes it involves narrow air-fuel mixture channels, which have been developed to increase the heat exchange efficiency [8]. Since a plate-shaped HEX is more efficient in terms of heat exchange [3], and more compact, a plate-shaped HEX with the shortest possible air-fuel mixture channel should be preferred in the design.…”

“…In addition, experiments, in which the air-fuel mixture was heated after carburisation, do not show by how much pumping losses increased due to the heater that had been added to the engine. In both of the methods mentioned above, the reason for the decrease in the engine performance could be down to the extended air-fuel mixture channel, which increased friction and impeded the movement of the air-fuel mixture [8]. It is important to point out here that a tube-shape heat exchanger (HEX) was used in the research.…”

Air-Fuel Mixture Temperatures with Light and Heavy Fuels for Effective Spark Ignition Engine Work

“…An SI engine with a carburettor FSS can use EF, Jet without additives, and CI fuels such as diesel fuel (DF) and hydrogenated vegetable oil (HVO) if the air-fuel mixture (AFM) is heated [10]. The effect of heating heavy fraction fuels in the SI engine has been previously studied in carburettor and injection FSS´s.…”