INFLUENCE OF THE INLET SYSTEM DESIGN ON DUST CENTRIFUGATION AND THE PARTS WEAR OF THE MODERN INTERNAL COMBUSTION ENGINES

Abstract

with the classical method of a calibrated starter using the correlation of electric starter shaft torque while motoring the crankshaft with the diesel engine torque. Some standard motor oils viscosity-temperature characteristics regression dependences in the range of starting temperatures and the empirical torque dependence on the oil kinematic viscosity are determined. As a result, a table of equivalent cold start temperatures was created using variable loads during HSSDDE startup. On the basis of the results of the experiment the theoretically calculated values of equivalent cold start temperatures for other oils used in the operation of HSSDDE are given. Specified range of variation of the cold start equivalent temperature factor for further polyfactorial investiga-tion of the HSSDDE start process, which will take values of 0 °C, 5 °C and 10 °C. on the ICE design economic environmental of ab-normal unplanned reduction of the ICE durability due to increased abrasive wear. this, a study of typical design solutions of the intake system of the internal combustion engines from the point of view of their on the abrasive wear of the parts. In determining the possible sources of abrasive particles, it was found that the widely used air filters from fibrous materials have the property to pass dust when heavily contaminated. In this regard, for a typical element of the inlet system, a method was developed for calculating the curvilinear motion of the particle along the air flow line considering the acting forces near the lateral outlet from the channel. Calculation with the assumption of the air movement along the radius showed that, as a result of centrifugation, the dust particle deviates from the air flow line and moves by a larger radius which increases with the particle size and air speed. The reliability of the calculation results was estimated by numerically simulating a two-phase flow using the ANSYS software package. A coincidence of the calculation results by the method of particle motion calculation with the simulation results in the range of the most destructive abrasive particles of 10-20 μm with an accuracy of no worse than ± 20% is obtained. Comparison of calculation and simulation results with experimental data from studies of the causes of ICE failures confirmed that local abrasive wear in one or more cylinders can occur due to uneven particle distribution in the intake system. Based on the results obtained, recommendations are formulated to increase the reliability and durability of ICE in operation, including the need not only to take into account dust centrifugation processes during design, but also the possible refinement of maintenance procedures for existing ICEs.