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In this study, the injection characteristics of diesel and blends of diesel and gasoline were investigated on a common rail injection system, using two nozzles with different orifice diameter and opening pressure. The volumetric injection rate curves, volumetric and mass cycle injection quantities and the coefficient of variances within a range of changed injection pressure and energizing time were...
We propose a vehicle power and cooling/heating cogeneration energy supply system (VCESS) and investigate its thermodynamic characteristics under various working conditions. The cogeneration system includes a top engine cycle and a bottom waste heat recovery (WHR) cogeneration cycle using zeotropic mixtures as working fluids. The bottom cycle recovers the exhaust and coolant sensible heats of top engine...
Experimental study on dual fuel HCCI-DI stratified combustion mode is investigated with port injection of n-heptane and direct injection of primary reference fuels (PRFs) with different octane numbers from 0 to 100. Firstly, in-cylinder stratifications of mixture concentration, composition, and temperature for this HCCI-DI combustion mode were numerically simulated. The effects of the octane number...
This study proposes and investigates a novel VCES (Vehicle power and cooling/heating Cogeneration Energy System), including a topping vehicle engine subsystem, and a bottoming waste-heat recovery subsystem which uses the zeotropic working fluid. The various grade exhaust and coolant waste-heat of the topping subsystem are cascade recovered by the bottoming subsystem, and slide-temperature thermal...
The injection and spray characteristics of diesel and gasoline blends are investigated on a common rail injection system. The injection rate, fuel spray evolution process (tip penetration distance, spray cone angle, projected spray area and relative brightness intensity contour) and microscopic droplet features are analyzed. The results show that diesel and gasoline blends have higher volumetric injection...
This study analyses the integrated characteristics of a CPS (combined power system) consisting of a topping diesel engine and a bottoming ORC (organic Rankine cycle). Two models (an integrated and a cascaded CPS model) for the same CPS have been developed based on the experimental data. The results show that the process of integrating the ORC causes a substantial decrease in the power output of the...
Because the energy crisis and environmental pollution are significant concern, a next-generation combustion mode for internal combustion engines that can simultaneously reduce exhaust emissions and substantially improve thermal efficiency has attracted increasing attention. In the last two decades, diesel-fueled HCCI (homogenous charge compression ignition) combustion has been widely researched. It...
Air-cooled power plants have been extensively applied in the dry areas with the ACSC (air-cooled steam condensers) to reject the waste heat from the turbine exhaust. However, the performance of the relevant condensers is sensitive to the meteorological conditions due to its exposing in the ambient. As a result, it is too difficult for the air-cooled power plants to operate at the design efficient...
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