scholarly journals Improvement of Thermal and Mechanic Flow Characteristics in the Intake System of the Piston Engine with Turbocharging

2018 ◽  
Vol 3 (4) ◽  
pp. 132
Author(s):  
L V Plotnikov
Keyword(s):  
Flow Characteristics ◽  
Piston Engine ◽  
Intake System

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Thermal and mechanical improvement of the air supply system of a turbocharged piston engine

2021 ◽  
Vol 14 (2) ◽  
pp. 108-114
Author(s):  
Y. M. Brodov ◽  
L. V. Plotnikov ◽  
K. O. Desyatov
Keyword(s):  
Heat Transfer ◽  
Experimental Studies ◽  
Local Heat Transfer ◽  
Supply System ◽  
Scale Model ◽  
Piston Engine ◽  
Intake System ◽  
Gas Dynamic ◽  
Air Supply ◽  
Air Flows

A method of thermomechanical improvement of pulsating air flows in the intake system of a turbocharged piston engine is described. The main objective of this study is to develop a method for suppressing the rate of heat transfer to improve the reliability of a piston turbocharged engine. A brief review of the literature on improving the reliability of piston engines is given. Scientific and technical results were obtained on the basis of experimental studies on a full-scale model of a piston engine. The hot-wire anemometer method was used to obtain gas-dynamic and heatexchange characteristics of gas flows. Laboratory stands and instrumentation facilities are described in the article. The data on gas dynamics and heat exchange of stationary and pulsating air flows in gas-dynamic systems of various configurations as applied to the air supply system of a turbocharged piston engine are presented. A method of thermomechanical improvement of flows in the intake system of an engine based on a honeycomb is proposed in order to stabilize the pulsating flow and suppress the intensity of heat transfer. Data were obtained on the air flow rate and the local heat transfer coefficient both in the exhaust duct of the turbocharger compressor (i.e., without a piston engine) and in the intake system of a supercharged engine. A comparative analysis of the data has been carried out. It was found that the installation of a leveling grid in the exhaust channel of a turbocharger leads to an intensification of heat transfer by an average of 9%. It was found that the presence of a leveling grid in the intake system of a piston engine causes the suppression of heat transfer within 15% in comparison with the baseline values. It is shown that the use of a modernized intake system in a diesel engine increases its probability of failure-free operation by 0.8%. The data obtained can be extended to other types and designs of air supply systems for heat engines.

Numerical Calculation of Air Mass Flow in a Dual-Rotor Piston Engine

2013 ◽  
Vol 390 ◽  
pp. 306-312 ◽  
Author(s):  
Ten Gan Zou ◽  
Cun Yun Pan ◽  
Hai Jun Xu ◽  
Xiang Zhang ◽  
Hu Chen
Keyword(s):  
Numerical Calculation ◽  
Mass Flow ◽  
Driving Force ◽  
Flow Characteristics ◽  
Engine Test ◽  
Piston Engine ◽  
Air Mass ◽  
Structure Characteristics ◽  
Rotary Engine ◽  
Working Cycle

Dual-rotor piston engine (DRPE) is a new kind of rotary engine, which is still under developing. The air mass flow is an important parameter of the engine test, and it is a basic ingredient to calculate driving force and fuel consumption. In the paper, based on the structure characteristics of the DRPE, analyze the theoretical flow calculation, so as to study the air mass flow characteristics of the engine. Finally get the characteristics of the air mass flow. The results are consistent with DRPE working cycle trend.

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

2021 ◽  
Vol 23 (4) ◽  
pp. 43-54
Author(s):  
L. V. Plotnikov ◽  
Y. M. Brodov ◽  
B. P. Zhilkin ◽  
D. S. Shestakov ◽  
L. E. Osipov
Keyword(s):  
Spectral Analysis ◽  
Comparative Analysis ◽  
Flow Velocity ◽  
Pressure Pulsations ◽  
Piston Engine ◽  
Outlet Channel ◽  
Inlet System ◽  
Operating Cycle ◽  
Intake System ◽  
Gas Dynamic

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.

INVESTIGATION OF GUIDE VANE SWIRL AND TUMBLE DEVICE TO IMPROVE IN-CYLINDER AIR FLOW FOR COMPRESSION IGNITION ENGINE RUNNING WITH BIODIESEL

2015 ◽  
Vol 75 (8) ◽  
Author(s):  
Idris Saad ◽  
Saiful Bari
Keyword(s):  
Turbulent Flow ◽  
Guide Vane ◽  
Air Flow ◽  
Flow Characteristics ◽  
Calorific Value ◽  
Absolute Pressure ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Intake System ◽  
First Choice

Biodiesel is expected to become the main alternative fuel for transportation purposes in the coming future as a result of the recession of crude oil. The main advantage that makes biodiesel the first choice as a substitute for petroleum-based fuel is that biodiesel can be used in a compression ignition engine (CI) with minor modification. Unfortunately, with biodiesel, the engine experiences reductions in power and torque, and increases in fuel consumption and carbon deposits inside the combustion chamber mainly due to lower calorific value and heavier molecules present in the biodiesel. One of the solutions to minimize this problem is to increase the in-cylinder air motion and use this to break up the heavier molecules and mix these molecules with air. To achieve this, a high turbulent flow is required inside the cylinder. This paper presents the model of the Guide Vane Swirl and Tumble Device (GVSTD) to develop an organized in-cylinder turbulent flow. The basic model of GVSTD consists of simple fins imposed inside the intake system. Through computer simulations, the results of air flow characteristics are compared with a conventional intake system. The height of GVSTD vanes was varied at 25%, 50% and 75% of the intake runner radius. The results show that in-cylinder velocity, turbulence kinetic energy and absolute pressure at the start of the injection increase around 41%, 6% and 3%, respectively more than the ordinary system which is expected to improve the mixing of biodiesel and air resulting in better combustion.  

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