Improvement of Environmental Characteristics of Diesel Locomotive Engine with Turbocharging by Changing Valve Timing (Based on Miller Cycle)

Improving the exploitative and environmental performance of piston engines (PICE) is an urgent task for many engineers and scientists. The article presents the results of the upgrade of a gas-and-air system of a diesel PICE, carried out through changing the turbocharging system’s configuration and modernizing the design of the admittance collector. The authors present a review of studies on the given subject and a description of the object of the research. The study was conducted on the basis of bench tests at a manufacturing plant and mathematical modeling using ACTUS program. The results of experimental studies on the main indicators of a basic and upgraded PICEs are presented. The gas exchange processes in the PICE under examination were studied in detail using mathematical modeling. For the given diesel PICE, improvement of the gas-and-air system leads to a growth in charging efficiency by 2.45-3.92%, a decrease in scavenging factor by 3.11-6.31% and a reduction of specific fuel consumption up to 3.33%. In the conclusion, new directions for increasing the efficiency of the given PICE are offered.

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“…This is confirmed by a large number of studies comparing the results of modeling and bench tests of PICEs. Some examples can be found in [22,23].…”

Section: Results Of the Studies And Analysismentioning

confidence: 99%

Integrated modernization of the gas-and-air system of a turbocharged diesel engine (21/21)

2020

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“…The general view of the diesel engine is shown in Figure 1. As a result of previous studies, it was found that losses associated with a decrease in the opening time of the intake valves and a slight deterioration in the quality of gas exchange in the cylinders can be partially compensated by an increase in the boost pressure As a result of previous studies, it was found that losses associated with a decrease in the opening time of the intake valves and a slight deterioration in the quality of gas exchange in the cylinders can be partially compensated by an increase in the boost pressure (by selecting the optimal flow paths of the turbochargers) and adjusting the fuel injection advance angle [30,31]. Accordingly, the main goal of these studies was to synchronize the fuel supply with the valve timing of a 21/21 diesel engine.…”

Section: Research Object and Problem Statementmentioning

confidence: 95%

“…The main objective of the study is to improve the technical, economic and environmental performance of the diesel engine in question. The influence of the Miller cycle on the operational and environmental performance of this diesel engine is discussed in [31,32].…”

Section: Introductionmentioning

confidence: 99%

Modernization of the Mechanical Fuel System of a Diesel Locomotive Engine through Physical and Numerical Modeling

Plotnikov

Grigoriev

2021

Energies

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Reducing harmful emissions from exhaust gases and increasing energy efficiency are urgent tasks when designing reciprocating internal combustion engines. In this experimental work, the fuel system of a diesel locomotive engine operating on the Miller cycle is improved. The purpose of the study is to improve the environmental and economic indicators of diesel engines at minimal financial cost. The article provides an overview of the main research on improving fuel supply, mixing and combustion. The features of engine operation are also briefly described. Numerical simulation of the diesel engine operating cycle was performed before the bench tests. The experiments were performed on a full-size diesel engine with a power of 1200 kW. The measuring equipment and experimental technique are described in the article. The technical solutions that made it possible to improve the fuel supply are described. A new design for the high-pressure fuel pump drive is proposed. The optimal fuel injection advance angles are determined. An original design for the fuel pump plunger was developed. The proposed technical solutions made it possible to reduce fuel consumption by up to 3% (from 217.8 to 211.4 g/kW·h) and NOx emissions two-fold (from 19.4 to 8.8 g/kW·h).

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Effects of asynchronous late intake valve closing combined with high geometric compression ratio and exhaust gas recirculation on combustion and fuel consumption in a turbocharged SI engine:An experimental study

Wang,

Qiao,

Jia

et al. 2024

Energy

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Improvement of Environmental Characteristics of Diesel Locomotive Engine with Turbocharging by Changing Valve Timing (Based on Miller Cycle)

Cited by 3 publications

References 21 publications

Integrated modernization of the gas-and-air system of a turbocharged diesel engine (21/21)

Integrated modernization of the gas-and-air system of a turbocharged diesel engine (21/21)

Modernization of the Mechanical Fuel System of a Diesel Locomotive Engine through Physical and Numerical Modeling

Effects of asynchronous late intake valve closing combined with high geometric compression ratio and exhaust gas recirculation on combustion and fuel consumption in a turbocharged SI engine:An experimental study

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