Improving the technical and environmental performance of piston engines by upgrading the fuel system

The article presents the results of an experimental study of the dispersion of superheated water through cylindrical channels and nozzles of piston internal combustion engines under different initial conditions. The advantages and disadvantages of modern diesel engine fuel systems are discussed in the article. The process of explosive boiling in relation to the fuel system of a piston engine is formulated and briefly described. A description of the laboratory setup and methods of conducting experiments is given in the article. The results of the visualization of sprayed superheated water through a cylindrical channel and through a diesel engine nozzle of 21/21 dimension are presented. The original scheme of the fuel system for a diesel engine using the effect of explosive boiling is proposed. Preliminary estimates have shown that the use of such a fuel system will increase the reliability of the combustion chamber elements of a piston engine, reduce specific fuel consumption (up to 2%) and reduce the amount of harmful substances in exhaust gases (an average of 12% compared with traditional fuel systems). © The Authors, published by EDP Sciences

Operational development of piston engines by mathematical modeling of working process

В статье представлены результаты математического моделирования рабочего процесса поршневого двигателя внутреннего сгорания размерности 8,2/7,1. Математическое моделирование выполнялось в программном комплексе Дизель-РК, разработанном в МГТУ имени Н.Э. Баумана. Показано влияние показателей качества газообмена на технико-экономические показатели поршневого двигателя. Установлено, что доводка впускной и выпускной систем оказывает значительное влияние на основные показатели двигателя. За счет изменения конфигурации газовозудушных трактов двигателя можно увеличить его мощность вплоть до 11 % при увеличении удельного расхода топлива лишь на 0,5-1,5 %.The results of mathematical modeling of working process of the internal combustion engine (dimension 8,2/7,1) are presented in the paper. Mathematical modeling was performed in the software Diesel-RK developed in MSTU named after N. Uh. Bauman. The influence of quality indicators of gas exchange on technical and economic indicators of the engine are presented in the article. Operational development of the intake and exhaust systems has a significant impact on the basic performance of the engine. Changes to the configuration of the air-gas path of the engine increases power up to 11 % at simultaneous increase of specific fuel consumption of only 0.5 to 1.5 %.Работа выполнена при поддержке РФФИ (грант мол_а, договор № 16-38-00004\16)

Spectral analysis of gas-dynamic processes in the intake system of a supercharged piston engine

The study of gas-dynamic processes in gas-air systems of engines in order to improve the processes of gas exchange, mixture formation and combustion is an urgent task. The results of experimental studies of gas-dynamic processes in the intake system of an engine with turbo-compressor are presented in the article. A brief description of the setup and methods of experiments is presented. A spectral analysis of functions was chosen as a tool for monitoring gas-dynamic phenomena in different systems. A comparative analysis of the amplitude spectra of the pulsations of the velocity and pressure of the flows in the intake system of the engine with and without a turbo-compressor is presented in the article. The installation of a turbo-compressor leads to a significant change in the structure of gas flows in the intake system. A method for stabilizing the pulsating flow in the intake system by installing a leveling grid in the output channel of the compressor is proposed. It has been established that the presence of a leveling grid in the intake system of an engine with turbo-compressor leads to a decrease in the low-frequency amplitudes of the velocity pulsations and the pressure of the flow by up to 30%. © Published under licence by IOP Publishing Ltd.Russian Science Foundation, RSF: 18-79-10003The work has been supported by the Russian Science Foundation (grant No. 18-79-10003)

COMPARATIVE ANALYSIS OF THE FEATURES OF SPRAYING A HEATED GAS AND SUPERHEATED LIQUID THROUGH CYLINDRICAL CHANNELS WITH SLICES

The article presents the experimental studies results of a superheated liquid and a heated gas spraying through nozzles with cuts in order to determine the influence of the channel configuration on the characteristics of the jets. Experimental setups, experimental methods and instrumentation are described in the article. Photographing and thermal imaging was used to visualize the flow of liquids and gases. It was determined that there is no displacement of the jet axis relatively to the axis of the outlet opening when the heated gas flows through the nozzles with a cut. It is shown that there is a displacement of the axis of the jet relative to the axis of the outlet in the range of 15-18 degrees when the superheated water flows through the nozzles having a cut of the off outlet

INCREASING THE RELIABILITY OF PISTON ENGINES BY THE IMPROVEMENT OF THE MIXING PROCESS

The article presents the results of an experimental study of the spraying of superheated water through channels (holes in the nozzle), characteristic of piston internal combustion engines, under different initial conditions. The paper briefly discusses the advantages and disadvantages of modern fuel systems of diesel  engines. The process of explosive boiling is briefly described with reference to the diesel fuel system. The results of spraying superheated water through a  cylindrical channel and through a nozzle of an operating diesel of  dimension 21/21 are presented. The scheme for the implementation  of the diesel fuel system with the use of the explosive boiling effect  is proposed. Preliminary estimates have shown that the use of such  a fuel system will lead to an increase in the reliability of the  elements forming the combustion chamber of the engine, reducing the specific fuel consumption to 2 % and reducing the amount of harmful substances in the exhaust gases by an average of 12 %

MODELING OF LOGP FOR HYDROCARBON COMPOUNDS

ABSTRACT A method for calculation of partition coefficient LogP is introduced. The method is based on an atomic additive scheme. LogP value is obtained as a sum of individual contributions of each atom of the molecule. The atom contributions called increments correspond to atom classes derived on the base of local atomic properties. Increment values are calculated by means of linear regression applied for a set of hydrocarbon compounds. Test results are presented and discussed

QSPR Models for Predictions and Data Qualit\ue0 assurances: Melting Point and Boiling Point of Perfluorinated Chemicals,

10noneBhhatarai B.; Teetz W.; Öberg T.; Liu T.; Jeliazkova N.; Kochev N. ; Ognyan P.; Tetko I.; Kovarich S.; Gramatica P.Bhhatarai, Barun; Teetz, W.; Öberg, T.; Liu, T.; Jeliazkova, N.; Kochev, N.; Ognyan, P.; Tetko, I.; Kovarich, Simona; Gramatica, Paol