Двигуни внутрішнього згоряння

Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/62921

У публікаціях журналу розглядаються фундаментальні і прикладні проблеми сучасного двигунобудування, приводяться результати наукових досліджень, які виконані викладачами та науковцями вищої школи та НАНУ, аспірантами, докторантами, фахівцями галузевих установ, виробничих підприємств України і зарубіжжя, аналізуються проблеми, які пов'язані з удосконаленням конструкцій, експлуатацією, технологією виробництва двигунів внутрішнього згоряння.

Рік заснування: 2002. Періодичність: 2 рази на рік. ISSN 0419-8719 (Print)

Новини

Видання включене в Перелік наукових фахових видань України та присвоєна категорія «Б». Наказ МОН України №409 від 17.03.2020 р.

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Centrifugal compressor performance maps treatment for internal combustion engines operating cycle simulation
(Національний технічний університет "Харківський політехнічний інститут", 2021) Minchev, Dmytro; Varbanets, Roman
Simulation of the supercharged internal combustion engines operation cycle is impossible without correct estimation of the supercharger operating parameters. Standard approach is to use specially prepared performance maps of compressor and turbine of the turbocharger, which are based on the experimental (or manufacturer’s) raw data. Centrifugal compressor performance maps interpolation, extrapolation and treatment provides challenging requirements as it is important to get correct simulation under such special conditions as compressor choke, rotating stall and pumping surge. At the same time it’s important to obtain the fast and stable calculations of the engine’s operating cycle. Blitz-PRO – online internal combustion engines operating cycle simulation service – offers supercharger performance maps preprocessing and implementation. It provides three different modes of compressor surge consideration during calculations: 1) full-scale surge mode using Moore-Greitzer approach; 2) mild surge mode with flexible adjustment; 3) “stable” mode, when the surge is neglected and the compressor constant-speed lines are extended from the rotating stall point to the lower mass flow region with the hyperbolic equation. Using the MAN 8G70ME-E engine 12140 kW, 82 rpm operating point as an example, the calculation results are compared for three modes of compressor surge consideration. The “stable” mode provides the fastest and the most stable calculations, while the calculations under the full-scale surge mode could generate the numerical (nonphysical) instability of calculations, which are caused by the high sensitivity of the two-stroke engines to the gas exchange processes as it is shown. The mild surge mode provides fast and stable enough calculation with the surge consideration ability, which could be assumed as the best solution for the given example. The researcher should choose between provided three modes of the centrifugal compressor surge consideration according to the calculations tasks, preferring “stable” mode for initial model setup and mild surge mode for the surge probability check, while the accurate compressor surge simulation needs further development.
Enhanced diagnostic techniques for marine diesel engines: achieving imo decarbonization compliance
(Національний технічний університет "Харківський політехнічний інститут", 2023) Varbanets, Roman; Minchev, Dmytro; Savelieva, Iryna; Rodionov, Andriy; Mazur, Tetiana; Psariuk, Sviatoslav; Bondarenko, Vyacheslav
This paper discusses hardware-based methods for monitoring the operational parameters of marine diesel engines and online mathematical modeling techniques (digital twins) for calculating the emissions of CO₂, NOx, soot, and other harmful pollutants. It is demonstrated that measuring and analyzing the engine's vibrational diagrams in parallel with gas pressure diagrams in the cylinders allows the evaluation of the actual fuel injection and gas distribution timings. The obtained data is used to refine the mathematical model of the engine's working process, which determines the engine's indicator parameters and power, as well as the emission of harmful substances that need to be monitored in compliance with current IMO requirements. The authors have accumulated experience in using the discussed hardware-based methods for diagnosing marine engines during operation. The hardware and software methods discussed have been implemented into a real-time system for in-service diagnostics of marine engines. The system is designed based on a modern dual-core controller with high performance and low power consumption, incorporating a high-speed ADC with sufficient capability to monitor the working process with a 0.1-degree crankshaft rotation resolution for all types of marine main and auxiliary engines. The system also utilizes wireless data transmission technology. A contemporary Android/iOS smartphone or tablet serves as the computational and graphical component of the system. This real-time system enables the utilization of all the advantages of parallel pressure and vibroacoustic analysis, including real-time determination of key operating parameters, identification of top dead center position, and evaluation of fuel delivery and gas distribution phases. Additionally, it harnesses the benefits of employing a digital twin—an online mathematical model of the engine cylinder's working process. These solutions will enhance diagnostic quality and, ultimately, improve the operational efficiency of marine engines by reducing operational costs and extending the period of reliable, trouble-free operation.