Examinatal Study on Common Rail Diesel Engine for Multi-injection Strategies
Based on diesel engine equipped with common rail, the multi-injection strategies common rail diesel engine test bed is established with NI test system. In this test bed, the influences of optimized multi-injection strategies to diesel engine performances are studied. The test results show that by using multi-injection strategies, the diesel engine exhaust temperature can reduce 50???, and noises can reduce 15dB, and emission improve obviously.
International Multidimensional Engine Modeling User’s Group Meeting
Since years IFP applies CFD for understanding and developing internal combustion engines using gasoline or Diesel fuels (see [1] or [2] for examples of recent partnership works). In order to take full advantages of modern parallel super-scalar machines (SMP machines), IFP has recently developed an in-house solver [3] designed in a new hexaedrical unstructured and parallel formalism. Figure 1 illustrates, through the example of a conventional Direct Injection Diesel sector grid, the new grid design that the solver can handle. Now free sets of conformable hexaedra can be used for discretizing full complex 3D engine geometries. In order to lower the development cost and time, the OPEN-MP paradigm was chosen for parallelization. This paradigm allows us to work only on the most CPU time consuming routines and ensures the code portability on workstations and PCs.
Impact of Nuclear Data Uncertainties on Transmutation of Actinides in Accelerator-Driven Assemblies
Abstract The potential impact of nuclear data uncertainties on a large number of performance parameters of reactor cores dedicated to the transmutation of radioactive wastes is discussed. An uncertainty analysis has been performed based on sensitivity theory, which underlines the cross sections, the energy range, and the isotopes that are responsible for the most significant uncertainties. To provide guidelines on priorities for new evaluations or validation experiments, required accuracies on specific nuclear data have been derived, accounting for target accuracies on major design parameters. The required accuracies (mostly in the energy region below 20 MeV), in particular for minor actinide data, are of the same order of magnitude of the achieved accuracies on major actinides. Specific requirements also concern the improvement of minor actinide data related to decay heat and effective delayed-neutron fraction assessment.