scholarly journals A review of phenomenological spray penetration modeling for diesel engines with advanced injection strategy

2020 ◽  
Vol 12 ◽  
pp. 175682772093406
Author(s):  
Long Liu ◽  
Yan Peng ◽  
Dai Liu ◽  
Changfu Han ◽  
Ningbo Zhao ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Early History ◽  
Energy Crisis ◽  
Diesel Spray ◽  
Comprehensive Understanding ◽  
Spray Penetration ◽  
Modeling Methods ◽  
Combustion Optimization ◽  
Selection Of ◽  
Injection Strategies

Driven by the increasingly remarkable problems of environmental pollution and energy crisis, the combustion optimization of diesel engine seems to be more urgent than ever, therefore, advanced injection strategies are gradually proposed and employed in modern diesel engines. Phenomenological model, which serves as an effective tool to conduct the parametric study on the spray penetration, needs to be improved to fit the intensified injection condition. Since that there are no attempts to review the spray penetration model developments, in order to help to build a comprehensive understanding of diesel spray propagation, this article briefly summarized the early history and introduced the widely used classical and improved phenomenological spray penetration models. Besides, to provide a helpful reference for selection of suitable models, the modeling methods were analyzed and features and simulation of various models were discussed and compared. After that, the trend of modeling methods and promising directions for future spray modeling were suggested.

FEATURES OF ORGANOPHOSPHATES IMMOBILIZATION VIA STREPTAVIDIN-BIOTIN SYSTEM FOR EXPERIMENTS ON SELECTION OF APTAMERS

2020 ◽  
pp. 12-20
Author(s):  
D. A. Belinskaya ◽  
Yu. V. Chelusnova ◽  
V. V. Abzianidze ◽  
N. V. Goncharov
Keyword(s):  
Polyethylene Glycol ◽  
Organophosphorus Compounds ◽  
Binding Energies ◽  
Rna Aptamers ◽  
Main Method ◽  
Modeling Methods ◽  
Molecular Dynamics Methods ◽  
Systematic Evolution ◽  
Exponential Enrichment ◽  
Selection Of

Poisoning with organophosphorus compounds occupy one of the leading places in exotoxicosis. At the first stage, the detoxification of organophosphates can be provided with the help of DNA or RNA aptamers that bind the poison in the bloodstream. Currently, the main method of searching for aptamers is the experimental method of systematic evolution of ligands by exponential enrichment (SELEX). In the process of aptamer selection, the target molecule must be immobilized via the streptavidin-biotin complex. Since the poison molecule is small in size, to increase its availability for binding to aptamer, it is necessary to use a spacer between organophosphorus compounds and biotin. The aim of this work was to optimize the selection of aptamers for organophosphorus compounds by increasing the availability of a poison molecule immobilized via the streptavidin-biotin complex on the example of paraoxon. For this purpose, three spacers between organophosphorus compounds and biotin were tested using molecular modeling methods: three links of polyethylene glycol (3-PEG), four links of polyethylene glycol (4-PEG) and aminohexyl. The conformation of the biotinylated paraoxon complex with streptavidin and the interaction of paraoxon with the binding fragment of the aptamer were modeled using molecular docking and molecular dynamics methods. The ability of biotinylated paraoxon to bind to the aptamer has been evaluated by analyzing the surface area of the paraoxon available to the solvent, as well as by calculating the free binding energies. It has been shown that only in the case of aminohexyl immobilized paraoxon can contact the aptamer. At the final stage, the synthesis of paraoxon bound to biotin via aminohexyl was carried out.

Switching Converters Development Systems for Electrostart Diesel Engine Start

2015 ◽  
Vol 792 ◽  
pp. 529-535
Author(s):  
Stanislav V. Makarov ◽  
Alexander Vladimirovish Myatez ◽  
Vitali D. Suslyakov
Keyword(s):  
Diesel Engine ◽  
Circuit Design ◽  
Diesel Engines ◽  
Switching Converters ◽  
Power Circuit ◽  
Advantages And Disadvantages ◽  
Pulse Converter ◽  
Engine Start ◽  
Selection Of

The article presents the research aimed at improving the efficiency of the diesel engines running. The advantages and disadvantages of the existing systems of the starter starting systems of diesel locomotives are considered. Brainstorming ideas on the issue of the calculation and selection of the alternative circuitry power circuit pulse converter starting system of diesel engines are described in the paper. An example of calculating the regulating characteristics of the pulse converter and the efficiency of the proposed circuit design is reported.

Quasi-Dimensional Diesel Engine Combustion Modeling With Improved Diesel Spray Tip Penetration, Ignition Delay, and Heat Release Submodels

2017 ◽  
Vol 139 (11) ◽  
Author(s):  
Shuonan Xu ◽  
Hirotaka Yamakawa ◽  
Keiya Nishida ◽  
Zoran Filipi
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Diesel Engines ◽  
Ignition Delay ◽  
Air Entrainment ◽  
Oxygen Mixture ◽  
Diesel Spray ◽  
Spray Tip Penetration ◽  
Simulation Tools ◽  
The Impact

Increasingly stringent fuel economy and CO2 emission regulations provide a strong impetus for development of high-efficiency engine technologies. Diesel engines dominate the heavy duty market and significant segments of the global light duty market due to their intrinsically higher thermal efficiency compared to spark-ignited (SI) engine counterparts. Predictive simulation tools can significantly reduce the time and cost associated with optimization of engine injection strategies, and enable investigation over a broad operating space unconstrained by availability of prototype hardware. In comparison with 0D/1D and 3D simulations, Quasi-Dimensional (quasi-D) models offer a balance between predictiveness and computational effort, thus making them very suitable for enhancing the fidelity of engine system simulation tools. A most widely used approach for diesel engine applications is a multizone spray and combustion model pioneered by Hiroyasu and his group. It divides diesel spray into packets and tracks fuel evaporation, air entrainment, gas properties, and ignition delay (induction time) individually during the injection and combustion event. However, original submodels are not well suited for modern diesel engines, and the main objective of this work is to develop a multizonal simulation capable of capturing the impact of high-injection pressures and exhaust gas recirculation (EGR). In particular, a new spray tip penetration submodel is developed based on measurements obtained in a high-pressure, high-temperature constant volume combustion vessel for pressures as high as 1450 bar. Next, ignition delay correlation is modified to capture the effect of reduced oxygen concentration in engines with EGR, and an algorithm considering the chemical reaction rate of hydrocarbon–oxygen mixture improves prediction of the heat release rates. Spray and combustion predictions were validated with experiments on a single-cylinder diesel engine with common rail fuel injection, charge boosting, and EGR.

scholarly journals Optimal Selection of Control Inputs for Diesel Engines

2008 ◽  
Vol 41 (2) ◽  
pp. 10704-10709
Author(s):  
Daniel Alberer ◽  
Markus Hirsch ◽  
Luigi del Re
Keyword(s):  
Diesel Engines ◽  
Optimal Selection ◽  
Selection Of

Paper 5: Application of Diesel Engines in the Royal Navy

1969 ◽  
Vol 184 (16) ◽  
pp. 32-43
Author(s):  
W. H. Sampson
Keyword(s):  
Automatic Control ◽  
Diesel Engines ◽  
Royal Navy ◽  
Lubricating Oils ◽  
Marine Propulsion ◽  
Improve Reliability ◽  
Selection Of

This paper deals with the application and selection of diesel engines for marine propulsion and auxiliary purposes with particular reference to the special requirements for naval applications. Details are given of the various means that have been developed for dealing with airborne and structure-borne noise, for reducing the effects of external shock, and for checking the quality of lubricating oils during service. Automatic control and protection equipments, including fluidic, are described and the paper finally deals with the means adopted to improve reliability and to reduce maintenance.

Selection of Swirl Ratio in Diesel Engines Based on Droplet Trajectory Analysis

2017 ◽  
Author(s):  
Yanzhe Sun ◽  
Kai Sun ◽  
Zhen Lu ◽  
Tianyou Wang ◽  
Mengqiu Jia
Keyword(s):  
Diesel Engines ◽  
Trajectory Analysis ◽  
Swirl Ratio ◽  
Droplet Trajectory ◽  
Selection Of

scholarly journals Assessment of Surfactant Flooding With Variations of Slug Injection Strategies in Waterflooded Reservoir

2017 ◽  
Vol 3 (3) ◽  
pp. 1
Author(s):  
Anan Tantianon ◽  
Falan Srisuriyachai
Keyword(s):  
Oil Recovery ◽  
Surfactant Concentration ◽  
Water Saturation ◽  
High Water ◽  
Late Time ◽  
Surfactant Flooding ◽  
Desorption Process ◽  
Surface Equilibrium ◽  
Selection Of ◽  
Injection Strategies

Injection of surfactant into waterflooded reservoir which has considerably high water saturation may cause a reduction in surfactant efficiency by means of surfactant dilution and adsorption. Therefore, to maintain expected lowest interfacial tension (IFT) condition, large amount of surfactant, which leads to higher cost, is inevitable. Several studies have observed that reduction in surfactant concentration slug at the late time can cause a shift in surface equilibrium, resulting in desorption of retained active surfactant agents and therefore, it is possible to obtain benefit from this phenomenon to achieve longer period of the lowest IFT condition while maintaining the amount of surfactant used. Hence, this study aims to evaluate effects of two-slug surfactant flooding compared to single-slug while maintaining amount of surfactant used constant in waterflooded reservoir. The performance is evaluated based on additional oil recovery using STAR® reservoir simulation program. Simulated results indicated that two-slug surfactant injection yields better oil recovery than conventional single-slug surfactant flooding due to benefit of sacrificial adsorption and desorption process of active surfactant. Selecting type of two-slug surfactant flooding strategy would depend on surfactant concentration of single-slug which is chosen for modification; whereas, the selection of magnitude of concentration contrast between two slugs would depend on placement of surfactant mass ratio.

scholarly journals FORMATION OF THE LEXEME’S CORPUS FOR THE LEVEL MODEL DEVELOPMENT OF LANGUAGE

2019 ◽  
Vol 7 (4) ◽  
pp. 80-84
Author(s):  
Irina A. Kuprieva ◽  
Stanislava B. Smirnova
Keyword(s):  
Model Development ◽  
Internal Flows ◽  
Organizational System ◽  
Cultural Organizations ◽  
Modeling Methods ◽  
Level Model ◽  
External Flows ◽  
Development Of Language ◽  
Theory Of Graphs ◽  
Selection Of

Purpose: The article deals with the principles of selection of factual material on the problem of fixing language invariants and variants. Methodology: This is an analytic-dialectical research in which the data was obtained through the analysis of language and grammar in English texts. Main Findings: As a result of using the system-object method of knowledge representation, a model for securing language variants is constructed. The UFO model of the organizational system can act as a network, production, and frame models. In conclusion, only the internal flows are of interest at the level of the function description, since the algebra of images of the theory of patterns and the theory of graphs are involved in external flows. Applications: This article can be used by regional schools, cultural organizations and universities. Novelty/Originality: In this research, a level model of language invariants and variants was developed and presented. Statistical accounting methods, linguistic and computer modeling methods were used on this model.

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