Determining the characteristics for the rational adjusting of an fuel-air mixture composition in a two-stroke engine with internal carburation

Volodymyr Korohodskyi,Oleh Vasylenko,Oleksandr Osetrov,Andrii Polivyanchuk,Vasiliy Migal,Andrii Rogovyi,Volodymyr Manoylo,Georgiy Slyn’Ko,Sviatoslav Kryshtopa

doi:10.15587/1729-4061.2020.200766

Abstract

An operating process for engines with spark ignition and direct fuel injection engines which ensures the formation of a stratified lean fuel-air charge under the modes of partial loads and the power composition of the fuel-air mixture at high loads has been developed. The design of a two-stroke spark-ignition engine was modernized by installing a direct fuel injection system, placing the nozzle in the cylinder wall, and changing the combustion chamber shape. A procedure of adjustment of the composition of the fuel-air mixture in the cylinder of a two-stroke spark-ignition engine has been developed. The procedure features the recording of engine parameters and indicators at a constant cycle fuel feed and intake air adjustment. The proposed procedure makes it possible to more accurately adjust the composition of the fuel-air mixture due to a more accurate dosage of air than the cycle fuel feed. Experimental studies were carried out and adjustment characteristics were constructed in terms of the air-fuel mixture composition in the cylinder of a two-stroke engine with a developed operating process. Load characteristics (at n=3,000 rpm) of rational adjustment in terms of economy and maximum power were constructed based on data on the adjustment characteristics for the composition of the fuel-air mixture. It was found that in terms of the load characteristic of rational economy adjustment, the composition of the fuel-air mixture in the engine cylinder (λ cyl.ec ) varied from 1.31 to 1.94 and the minimum fuel consumption was g e min =259 g/(kWh). In terms of the load characteristic of rational power adjustment, the composition of the fuel-air mixture in the engine cylinder (λ cyl. pow ) varied from 1.31 to 1.7, and the fuel consumption at partial loads was g e =270 g/kWh. Characteristics of airflow rate depending on the cycle fuel feed can be used to change the composition of the fuel-air mixture with automatic adjustment of the engine load

Highlights

Global energy consumption between 2018 and 2050 will increase by almost 50 % and reach on average 911 quadrillion British thermal units (BTUs)
During the forecast period until 2050, many world regions including countries that are not members of the Economic Cooperation and Development Organization (ECDO), Europe and Eurasia, Middle East and Africa will mainly use small-tonnage vehicles with internal combustion engines (ICE) that run on fuels of oil origin
The study line related to determining characteristics of rational adjustment of the fuel-air mixture (FAM) composition depending on the operating mode of a two-stroke spark-ignition engine with internal mixture formation is relevant

Summary

Manoylo

PhD, Senior Lecturer Department of Heat Engineering, Heat Engines and Energy Management. Ukrainian State University of Railway Transport Feuerbacha sq., 7, Kharkiv Ukraine, 61050. PhD, Associate Professor Department of Internal Combustion Engines National Technical University “Kharkiv Polytechnic Institute” Kyrpychova str., 2, Kharkiv, Ukraine, 61002 *Kharkiv National Automobile and Highway University Yaroslava Mudroho str., 25, Kharkiv, Ukraine, 61002. **Department of Tractors and Cars Kharkiv Petro Vasylenko National Technical University of Agriculture.

Introduction

Literature review and problem statement

The aim and objectives of the study

Discussion of the results obtained in studying

Findings

Conclusions