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A fully coupled heat transfer model at pore-scale of volumetric solar receiver is established in this paper. The X-ray computed tomography technique is applied to reconstruct the porous structure. By generating the voxel mesh and coupling with the Monte Carlo Ray Tracing method, the energy source due to the solar radiation could be determined and then added to the unstructured CFD mesh. The governing...
By using a multi-dimensional computational fluid dynamics (CFD) code, the combustion process of a heavy-duty diesel engine with low temperature combustion (LTC) at different loads was investigated. Based on the optimization results, the potential of the late intake valve closing (LIVC) strategy coupled with boosted intake pressure, as well as the influence of fuel injection timing and exhaust gas...
By coupling a multi-dimensional computational fluid dynamics (CFD) code with genetic algorithm (GA), the combustion of a heavy-duty diesel engine with LTC (low temperature combustion) was optimized under a wide load range. At each load, a comprehensive optimization of the operating parameters including IVC (intake valve closing) timing, SOI (start of injection) timing, EGR (exhaust gas recirculation)...
The influence of fuel chemical properties on combustion characteristics of a RCCI (reactivity controlled compression ignition) engine was investigated using multi-dimensional simulations. The operating ranges of combustion phasing (CA50) for gasoline/diesel and methanol/diesel RCCI combustion were determined with respect to limited boundaries of fuel efficiency, RI (ringing intensity), and NOx (nitrogen...
Spray combustion of n-heptane in a constant-volume vessel under engine-relevant conditions was investigated using linear eddy model in the framework of large eddy simulation. In this numerical approach, turbulent mixing was traced by an innovative stochastic approach instead of the conventional gradient diffusion model. Chemical reaction rates were calculated with the consideration of the sub-grid...
By integrating an updated multi-dimensional model and the NSGA-II (non-dominated sorting genetic algorithm II), the combustion of a RCCI (reactivity controlled compression ignition) engine fueled with methanol/diesel was optimized. Based on the optimization results, parametric study was performed by varying energy fraction of methanol, EGR (exhaust gas recirculation rate, initial in-cylinder pressure...
The effects of tumble combined with EGR (exhaust gas recirculation) on the combustion and emissions were experimentally investigated in a spark ignition engine in this study. A low pressure loop EGR system and a variable tumble valve in intake ports were employed, by which wide range of EGR ratio and tumble ratio could be achieved. All the tests were performed at part loads, and the equivalence ratio...
By using exergy efficiency as an objective function, the performances of three different organic Rankine cycles (ORCs) systems including the basic ORC (BORC) system, the single-stage regenerative ORC (SRORC) system and the double-stage regenerative ORC (DRORC) system using six different working fluids under the same waste heat condition are examined. The genetic algorithm (GA) is chosen as a novel...
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