The method is applied to a general cycle which embraces the Otto, Diesel, Atkinson, Humphrey, etc., cycles. In turbines and turbo-compressors the heat drop, velocity change, losses, etc., are given by readings from the temperature and internal energy graph. ![]() ![]() In the paper it is shown by suitable selection of scales how the temperature-internal energy graph may be used to indicate enthalpy, and, for engine expansions, the work done and the energy supplied. ![]() ![]() Graphical solutions find favour because ( a) widely varying mixtures of gases are used in modern engines, ( b) the specific heats of the gases vary with temperature and pressure, and ( c) the complete combustion of hydrogen, carbon, etc., cannot occur at high temperatures owing to dissociation. The development of the internal combustion turbine engine has reawakened interest in the study of thermodynamic problems associated with internal combustion engines.
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