Increasing reliability of gas–air systems of piston and combined internal combustion engines by improving thermal and mechanic flow characteristics

Brodov, Yu. M.; Григорьев, Н. И.; Жилкин, Б. П.; Plotnikov, L. V.; Шестаков, Д. С.

doi:10.1134/s0040601515140049

Cited by 13 publications

(3 citation statements)

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“…The dependences of the local heat transfer coefficient x over time τ for all three studied control sections at the different crankshaft rotation frequencies n are shown in Figure 4. These data are important in terms of estimating thermal stresses in the parts and nodes of the exhaust system [19].…”

Section: The Results Of Experimental Studiesmentioning

confidence: 99%

Heat transfer intensity of pulsating gas flows in the exhaust system elements of a piston engine

2019

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Internal combustion engines are the most common sources of energy among heat engines. Therefore, the improvement of their design and workflow is an urgent task in the development of world energy. Thermal-mechanical perfection of the exhaust system has a significant impact on the technical and economic performance of piston engines. The article presents the results of experimental studies of gasdynamics and heat exchange of pulsating gas flows in the exhaust system of a piston engine. Studies were carried out on a full-scale model of a single-cylinder engine. The article describes the instrument-measuring base and methods of experiments. The heat transfer intensity was estimated in different elements of the exhaust system: the exhaust pipe, the channel in the cylinder head, the valve assembly. Heat transfer studies were carried out taking into account the gas-dynamic nonstationarity characteristic of gas exchange processes in engines. The article presents data on the influence of gas-dynamic and regime factors on the heat transfer intensity. It is shown that the restructuring of the gas flow structure in the exhaust system occurs depending on the engine crankshaft speed, this has a significant impact on the local heat transfer coefficient. It has been established that the heat transfer intensity in the valve assembly is 2-3 times lower than in other elements of the exhaust system.

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Section: The Results Of Experimental Studiesmentioning

confidence: 99%

Heat transfer intensity of pulsating gas flows in the exhaust system elements of a piston engine

2019

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“…Thus, we can assume that the use of the effect of ejection will reduce the thermal tensions of the exhaust system and increase its reliability, because there is a slight decrease in the intensity of heat transfer, and ejection air cools the exhaust gases additionally [12].…”

Section: The Main Results Of Experimental Studiesmentioning

confidence: 99%

Improvement of the thermal and mechanical flow characteristics in the exhaust system of piston engine through the use of ejection effect

Plotnikov

Жилкин

Brodov

2017

J. Phys.: Conf. Ser.

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“…Это указывает на стабилизацию нестационарного течения, что потенциально может улучшить наполнение цилиндра воздухом (рабочим телом), вследствие снижения гидравлического сопротивления рассматриваемой системы. Более того, обнаруженная стабилизация течения в перспективе также может улучшить показатели надежности деталей и узлов системы впуска ПДВС с ТК, поскольку известно, что стабилизация пульсирующих потоков приводит к подавлению уровня теплоотдачи и, соответственно, снижению термических напряжений [30].…”

Section: Graphs Of the Amplitudes Of The Spectrum Of The Air Flow Velocity W X In The Basic Intake System (1) And In The Intake System Wiunclassified

Spectral analysis of gas dynamic processes in the inlet system of a piston engine with turbocharger

Plotnikov

Brodov

Жилкин

et al. 2021

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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THE PURPOSE. To carry out a comparative analysis of the spectra of gas-dynamic characteristics of flows in the intake systems of piston engines with and without turbocharging, to assess the degree of influence of the turbocharger on the flow structure in such systems, and also to propose a method for the gas-dynamic improvement of processes in the system under consideration. METHODS. Due to the complexity of the object of research, an experimental approach was taken as a basis. The experiments were carried out on a single-cylinder piston engine model, which could be equipped with a turbocharger. A system for collecting and processing experimental data based on an analog-to-digital converter was used in the study. Data on changes in local values of velocity and static pressure of pulsating flows in the intake system during the engine's operating cycle were obtained using a constant temperature hot-wire anemometer and a fast-acting pressure sensor. Spectral analysis of functions of flow velocity and pressure versus time was carried out on the basis of the fast Fourier transform algorithm.RESULTS. The article presents a comparative analysis of the spectra of the amplitudes of the velocity and pressure pulsations in the intake system of an engine with and without turbocharging. Also proposed is a method for stabilizing the pulsating flow in the intake system by installing a leveling grid in the outlet channel of the turbocharger compressor. CONCLUSION. It is shown that the installation of a turbocharger leads to a significant change in the structure of gas flows in the intake system of the engine. It has been established that the presence of a leveling grid in the intake system of a turbocharged piston engine leads to a decrease in the low-frequency amplitudes of the flow velocity and pressure pulsations up to 30%. It is shown that the probability of failure-free operation of an automobile engine (cylinder diameter – 82 mm, piston stroke – 71 mm) increases by almost 1% when a leveling grille is used in the intake system.

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Increasing reliability of gas–air systems of piston and combined internal combustion engines by improving thermal and mechanic flow characteristics

Cited by 13 publications

References 0 publications

Heat transfer intensity of pulsating gas flows in the exhaust system elements of a piston engine

Heat transfer intensity of pulsating gas flows in the exhaust system elements of a piston engine

Improvement of the thermal and mechanical flow characteristics in the exhaust system of piston engine through the use of ejection effect

Spectral analysis of gas dynamic processes in the inlet system of a piston engine with turbocharger

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