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The pre-turbine steam injection and the Miller cycle can be combined together to improve engine performances, but matching strategies of those two approaches under different operating conditions still need to be clarified. In this paper, thermodynamic processes of the pre-turbine steam injection and the Miller cycle are studied first followed by matching strategies based on a non-dimensional matching...
In this paper, an accurate turbocharged Dual cycle model integrating the pumping process is proposed with all the assumptions of an air-standard cycle are relaxed. Effects of the turbine cross section, turbocharger efficiency, excess air coefficient, load and wastegate on the turbocharged Dual cycle are investigated based on a calibrated diesel engine model in Matlab software. The Miller cycle under...
In this paper, an in-cylinder waste heat recovery system especially for turbocharged engines is proposed to improve the thermal efficiencies of internal combustion engines. Simplified recovery processes can be described as follows: superheated steam generated by engine waste heat is injected into the pipe before the turbine to increase the boost pressure of the fresh air; intake valve close timing...
In this paper, a theoretical study on the thermodynamic processes of a bottoming Rankine cycle for engine waste heat recovery is conducted from the viewpoints of energy balance and exergy balance. A theoretical formula and an exergy distribution map for qualitative analyses of the main operating parameters are presented under simplified conditions when exhaust gas is selected as the only heat source...
This paper describes knocking combustion in a diesel homogeneous charge compression ignition (HCCI) engine. The knocking combustion was investigated by a harmonic analysis, and the complex logarithmic spectrum (CLS), calculated by Fast Fourier Transformation (FFT) based on the acquired in-cylinder pressure, was defined to evaluate the knocking intensity. The consistencies among maximum in-cylinder...
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