Thermodynamic condition of cylinder diesel group for infrastructure objects under high temperatures

Abstract

The article presents the results of research on the influence of ambient temperature on the thermal state of cylinder-piston groups of diesel engines, carried out by the experimental-calculation method on diesel engines 12ChN 18/20 (M787B) and 8ChN 13/14 (YAMZ-7511.10) of autonomous sources on factory test benches. In the experimental study of the effect of temperature change on the thermal state of cylinder-piston groups, the diesels were equipped with a special water-air heat exchanger for heating the air at the suction to the compressor, and the temperature of the suction air was regulated by changing the flow rate of hot water through the water-air heat exchanger. In the experimental study, along with the thermometry of parts of cylinder-piston groups, the engine operating process was indicated, the heat balance was taken, etc.; and the experimental data of other researchers were analyzed. The results of this experimental study, as well as analyzing the results of earlier work on the effect of temperature on the thermal state of cylinder-piston groups allowed to obtain empirical dependencies of local temperatures of the walls of their parts, the distinguishing feature of which is that as variables are considered their relative (dimensionless) values, which increases the degree of experimental data. The results of the performed research can be used for the calculated estimation of the temperature level in the walls of parts of cylinder-piston groups of diesel engines of a wide class of both stationary and transport diesel engines, while providing satisfactory convergence of the calculation results with the experimental data.