Abstract
The analysis of the distribution of thermal energy generated during the combustion process in internal combustion engines and the estimation of individual losses are important regarding performance and efficiency. The article analyses the energy balance of the designed two-stroke opposed piston diesel engines with offset, i.e. the angle by which the crankshaft at the side of exhaust ports is ahead of the crankshaft at the side of intake ports. Based on the developed zero-dimensional engine model, a series of simulations were performed in steady-state conditions using the AVL BOOST software. The values of individual energy losses, including cooling losses, exhaust gas losses, friction losses were obtained. The influence of decreasing and increasing the offset on the performance of the tested engine was analysed.
Highlights
IntroductionBoth turbine and piston engines are used. The choice of the drive depends on the assumptions for the design of a particular aircraft
In aviation, both turbine and piston engines are used
There is a different distribution of thermal energy generated during the combustion process in particular cylinders as a result of the construction of the radial engine
Summary
Both turbine and piston engines are used. The choice of the drive depends on the assumptions for the design of a particular aircraft. There is no doubt that in the case of aircrafts that travel at relatively low speeds, it is reasonable to choose piston engines. Such a solution results directly from flight time which affects the mass balance of the implemented drive and fuel. If there is no need to move at high speeds, the reciprocating drive in airplanes meets those expectations For this reason, a testing of internal combustion piston engines continues. Two-stroke engines which are characterised by higher thermal efficiency compared to four-stroke engines deserve particular attention They provide more unit power and their construction is simple due to no timing system. Compared to four-stroke engines, they are characterised by low losses of heat to the coolant, while at the same time they have higher heat losses [7]
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