Pollution Research Paper

PHYSICAL SIMULATION OF HIGH- AND MEDIUM-SPEED ENGINESPOWERED BY NATURAL GAS

VLADIMIR VIKTOROVICH SINYAVSKI, IGOR VLADIMIROVICH ALEKSEEV, IGOR YEVGENYEVICH IVANOV, SERGEY NIKOLAYEVICH BOGDANOV ANDYURIY VASILYEVICH TROFIMENKO

Abstract

Engine conversion to natural gas facilitates reduction of expenses for fuel and motor oil, decreasein toxic emissions. This measure is especially urgent after validation of recent ecological norms fordiesel engines, since it eliminates necessity to apply large and expensive urea-based catalyticconverters required for diesel engines to conform with these requirements. In the course of projectsperformed by MADI aimed at development of high- and medium-speed natural gas engines,modular system of gas supply and electronic control system of gas diesel engine were designed andfabricated. Three modules can be applied for gas supply of the medium-speed 6 cylinder enginehaving D/S = 200/280 mm and one module –for the high-speed 6 cylinder engine having D/S = 107/124 mm. MADI carried out conversion of the high-speed diesel engine into gas diesel engine withminimized portion of ignition diesel fuel supplied by Common Rail system aiming at experimentaladjustment of the aforementioned systems. Calibration of gas diesel engine was based on benchtest results and simulation of operation using the computational complex developed by MADI. Thebench test results of the high-speed gas diesel engine demonstrated that experimental gas supplysystem and electronic control system made it possible to achieve higher rate of replacement ofdiesel fuel (from 5% under full loads to 33% at idle mode), high effective efficiency, as well assignificant reduction of NOx and CO2 emissions. Lower torque was obtained at low speed than thatof basic diesel engine. Calculated parameters of the medium-speed and high-speed gas dieselengines were compared under similar conditions (equal mean effective pressure, mean pistonspeed and pressure of boosted air), demonstrating close indicated values. It allowed to expect highparameters of the medium-speed gas diesel engine with application of the gas supply system andelectronic control system developed for the high-speed gas diesel engine after their appropriateadaptation.