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Theoretical investigation of operating process of conrod-free model cylinder

Journal: Bulletin of Prydniprovs'ka State Academy of Civil Engineering and Architecture (Vol.2019, No. 4)

Publication Date:

Authors : ;

Page : 49-57

Keywords : conrod-free internal-combustion engine; cylinder model; operating cycle; fuel efficiency; optimization of the parameters of internal-combustion engine; model of intake system; model of exhaust system;

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At present, there is a significant number of well-known methods and mathematical models to calculate the operating process of four-stroke internal-combustion engine. However, well-known models do not consider the effects of kinematics of engine, which has peculiarities at most of internal-combustion engines. Practically it does not allow to use well-known mathematical models of operating cycle and respectively to optimize the parameters of conrod-free internal-combustion engine. The model can be introduced as containing several submodels: the model of intake system (air cleaner, carburetor or butterfly throttle, inlet water pipe, cylinder head, intake valve); the model of cylinder(filling process, compression, combustion and extension); the model of exhaust system (exhaust valve, exhaust water pipe, muffler). The purpose of the article – to offer the model of the cylinder and corrected methods of calculation of the operating cycle of engine, including as the base intake water pipe. Conclusion. According to the accuracy of calculations, the given mathematical model compares well with well-known programs but it is much easier, less laborious and demands less machine time. The model of parameters change of operating body in cylinder is used to calculate the processes of compression, filling, combustion and extension. The model of intake system allows to define the consumption of gases through exhaust valve according to current pressure in cylinder and average pressure in water pipe. The model allows to evaluate the actions directed to the optimization of the structure of engine and to increase its fuel efficiency.

Last modified: 2019-10-17 18:35:12