Use of Gas Desorption Effect in Injection Systems of Diesel Engines

Maciej Bajerlein,Wojciech Karpiuk,Rafał Smolec

doi:10.3390/en14010244

Maciej Bajerlein, Wojciech Karpiuk + Show 1 more

Open Access

https://doi.org/10.3390/en14010244

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Journal: Energies	Publication Date: Jan 5, 2021
Citations: 5	License type: CC BY 4.0

Affiliation: Poznań University of Technology

Abstract

The article presents a concept of improving operation of the engine with the effect of gas desorption from a solution with nucleation of gas bubbles. This concept consists in dissolving gas in diesel fuel until the solution is in equilibrium. At a later stage, the phenomenon is reversed, and the gas is released from the solution during its injection into the combustion chamber. The purpose of the study is to present the idea of the desorption effect along with a thermodynamic analysis of the process and to study its impact on the operation of a diesel engine. The article also describes the most important features of the injection pump adapted to employ the desorption effect, which is a proprietary, patented solution. The conducted engine preliminary tests concerned the most important parameters of the engine’s operation (indicated pressure course, pressure growth rate, heat release rate, etc.) and the emission of harmful compounds (PM—particulate matter, CO, HC, and NOx—nitrogen oxides). A significant reduction of PM, CO, and HC, with a simultaneous increase in NOx emissions obtained in tests, confirmed that the desorption effect facilitated engine operation.

Highlights

Modern diesel engines, apart from their unquestioned advantages, have certain disadvantages
The main cause of these problems is the nature of the combustion process, which begins with the introduction of fuel into the combustion chamber
The results marked with index k were obtained on the basis of the tests performed with a conventional injection pump (Bosch CP1)

Summary

Introduction

Apart from their unquestioned advantages, have certain disadvantages. In conclusion of the above-mentioned remarks, it is necessary to answer a question as to whether the ongoing quest [12,13,14,15,16,17] to obtain increasingly higher pressures while trying to overcome the discussed problems is the only direction of development of injection systems. Is it possible to obtain the quality of fuel preparation, satisfactory in view of the combustion process, by other means, e.g., by increasing the number of stimuli sparking the stream decay mechanism?

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