The study of the influence of design parameters of turbocompound diesel engine on its fuel consumption

The rated studies of the influence of cross sections of turbine compressor and power turbine and also phases of gas distribution on the fuel consumption of turbocompound diesel engine are considered. The studies are executed by the model, created on the base of generalized numerical method of calculation of diesel engine performance, complemented by authors for the presence of power turbine. By using different combinations of minimum cross sections of power turbine and turbine compressor of 8ЧВН 15/16 diesel engine, the possibility of maximum gain receipt according to ge about 7.7 g/(kWt × h) using reduction gear box with coefficient of efficiency about 0.95 is shown. If power turbine transmits power to gear system of the fan of B-500Д diesel engine, gain by ge is about 6.4 g/(kWt × h) using reduction gear box with the same coefficient of ef-ficiency. During calculations of influences of change of gas distribution phases, using in addition the method of experiment planning, there were received regres-sion dependences of total specific fuel consumption geΣ on engine gas distribution phases. In comparison with serial phase usage increase of geΣ is about 0.6 g/(kWt × h), that is too small and does not justify the production of new cam-shafts. The method of study of the gas distribution phase influence may be used for other diesel engines.