Computational study of a combined plant with the piston engine equipped with the turbocharged and drive compressors

Improvement of the diesel engine performance is achieved by forcing its power, for which the engine is equipped with the supercharging systems of different types. The paper analyzes design schemes of the supercharging systems in the automobile combined diesel engines. It uses the Diesel-RK software package to analyze comparatively performance indicators of the D-245 diesel engine with a standard gas-turbine supercharging system and a supercharging system with the driven compressor. It studies the steady-state modes in the external speed characteristic at the crankshaft speeds of 2400, 2000, 1600, 1200 and 800 min^–1. The paper notes that replacing the supercharging system with a turbocharger by a supercharging system with a driven compressor significantly affects the engine performance. The efficient engine power decreases by 5.8...6.6 %, and smoke content in the exhaust gases — by 1.6...2.1 times. The specific efficient fuel consumption increases by 6.1...8.5 %, the nitrogen oxides content in the exhaust gases increases by 1.4...2.0 times, and the carbon dioxide - by 6.1...8.4 %. The paper indicates that a combined engine with the turbocharger should be preferably used in the steady-state modes with a small proportion of the unsteady modes, while the combined engine with a driven compressor - in conditions with significant predominance of the unsteady modes.
EDN: LDPPAB, https://elibrary/ldppab

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