Thermodynamic work in inline piston gasoline engines as a function of crank angle

The purpose of this research work is to identify the laws of thermodynamic operation in the theoretical cycles of four-stroke inline piston gasoline internal combustion engines (ICE). The main results: dependence of the thermodynamic operation of the working body of ICE in theoretical cycles of four-stroke inline piston gasoline engines as a function of the angle of rotation of the crankshaft; regularities of uneven generation of positive thermodynamic operation in the theoretical cycle of four-stroke inline one-, two-, three -, five-cylinder piston gasoline ICE; regularities of the alternating character of thermodynamic operation in the theoretical cycles of inline four-stroke one -, two -, three -, four - and five-cylinder gasoline piston ICE; regularities of positive thermodynamic operation during the entire theoretical cycle of four-stroke inline six-and eight-cylinder piston gasoline ICE; conditions for uniform pulsation of thermodynamic operation during the entire theoretical cycle of four-stroke inline piston gasoline ICE - the product of the crankshaft angle by the number of cylinders must be 720o (four-cylinder inline with a crankshaft angle of 180o, six-cylinder inline with a crankshaft angle of 120o, eight-cylinder inline with a crankshaft angle of 90o).

Reseach on Back-Pressure Problems of the Twin-Scroll Compressors

By analyzing forces acting on moving scroll, a new calculation model of overturning moment is proposed, and the principle of opening the back-pressure hole is derived. The formula of crankshaft angle is given when the back-pressure hole is completely covered. The calculation results of dynamics are shown that the back pressure is almost inversely proportional to the center corner of the back-pressure hole. The results can be double-vortex ring compressor design and direct application of the study.