| Popis: |
The search for ways to improve the operational properties of internal combustion engines implies the development of research methods necessary for a more detailed understanding of the processes taking place in this type of thermodynamic machines. The pressure in combustion chamber, as a function of the angle of rotation of the engine crankshaft, is one of the most important parameters here. The work deals with a new method of analyzing this pressure. The concept of cumulative pressure has been introduced. The concept is not yet represented in the available literature. However, it correlates with the dynamics of heat release described in the literature as the Wiebe formula. Conclusions from theoretical considerations were developed on the basis of the results of the IC engine research. The tests were carried out under the conditions of the 13-mode ESC test. In each mode of the engine operation, 90 indicator charts were recorded, which gave a total of 1,200-element statistical sample. It was found that the course of the cumulative combustion pressure significantly depends on the engine load. The greater the engine load, the faster the cumulative pressure build-up, and the higher the rotational speed, the slower it is. The new method of description may be a significant contribution to the pursuit of obtaining optimal parameters of modern internal combustion engines. |
