The investigation of the flow characteristics inside the nozzle becomes more and more important because the flow status in the nozzle and fuel injection significantly influence the emission and economy of diesel engines. Due to limited experimental conditions, we can make use of computer simulation, UG models can be used to predict the flow pattern inside the injectors and promote the level of selection and design of injectors. In this investigation, the UG model is calculated by FLUENT software after considering the compressibility and the viscosity of the fuel. By studying, we can predict the distribution of flow field inside the nozzle, analysis the rationality of the design of nozzle, determine the appropriate boundary conditions, mainly includes the nozzle pressure chamber and the needle tip structure, points out that the improvement direction.
Space-time (ST) coding offers an effective transmit diversity technique to combat fading, but most existing space-time coding schemes assume flat fading channels that may not he valid for wideband wireless mobile communications. For multiuser transmissions over multipath environment (frequencyselective fading channel), ST coding is challenging due to the presence of not only MA1 (multiple access interference) but also IS1 (intersymbol interference) .In this paper, a novel ST block coding scheme based on block processing is proposed for TD-CDMA systems in frequency-selective channels, and block linear joint detection algorithms are developed. Then, we simplify these algorithms and get a low cost hut good performance joint detection algorithm for spacetime block-coded TD-CDMA systems.
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