THE INFLUENCE OF CROSS-PROFILING OF THE INTAKE AND EXHAUST PIPES OF PISTON ENGINES ON THERMAL AND MECHANIC FLOW

The main tasks of experimental research of thermal and mechanic processes in the intake and exhaust systems of piston internal combustion engines are to assess the impact of the configuration of pipes on the intensity of local heat transfer and the development of ways of its optimization. Data about intensity of the local heat transfer are the basis for determination of heating of the air (at intake), cooling exhaust gas (at exhaust), calculation of thermal stresses in the nodes and details of intake and exhaust systems. Results of experimental investigation of the instantaneous local heat transfer in the intake and exhaust pipes of different configurations for piston internal combustion engines are presented in this article. It is established that the cross profiling of the intake and exhaust pipes of piston engines leads to a de-crease in the local heat transfer intensity in the range of 5 to 20 % depending on the crankshaft speed.