In order to analyze the impact of engine cabin parts on aerodynamic characteristics, the related parts are divided into three categories except the engine cooling components: front thin plates (average thickness of 2mm), bottom-suspension and interior panels. The aerodynamic drag coefficient (Cd) were obtained upon the combination schemes consisting of the three types of parts by numerical simulation. Results show that Cd by simulation is closer to the test value gained by the wind tunnel experiment when front thin plates were simplified to the two-dimensional interface with zero thickness. The error is only 5.23%. Meanwhile this scheme reduces grid numbers, thus decreasing the calculating time. As the front thin plates can guide the flow, there is no difference on the Cd values gained from the model with or without bottom-suspension or interior panels when the engine cabin contains the front thin plates; while only both bottom-suspension and interior panels are removed, the Cd value can be reduced when the cabin doesn’t contain the front thin plates.
Road spray greatly affects vehicle body soiling and driving safety. The study of road spray has attracted increasing attention. In this article, computational fluid dynamics software with widely used finite volume method code was employed to investigate the numerical simulation of spray induced by a simplified wheel model and a modified square-back model proposed by the Motor Industry Research Association. Shear stress transport k-omega turbulence model, discrete phase model, and Eulerian wall-film model were selected. In the simulation process, the phenomenon of breakup and coalescence of drops were considered, and the continuous and discrete phases were treated as two-way coupled in momentum and turbulent motion. The relationship between the vehicle external flow structure and body soiling was also discussed.
The accumulation of industrial waste residues is a serious problem with the continuous development of industrial productions during the recent years, how to use reasonably the industrial waste residues has gradually turned into an important research field in the world. Therefore, the research and development of porous ceramics synthesized by the industrial waste residues of fly ash, coal gangue and red mud etc as the raw materials were introduced, the present preparation technique and characteristics of the porous ceramics synthesized by the industrial waste residues were analyzed, and its further investigation was discussed.
Thermal energy storage performance of a new type of PCM heat exchange tube was researched, in which its main body was based on the traditional structure of a double-tube exchanger and was full of PCM (calcium chloride hexahydrate) in the annular area between the inner tube and the outer tube. The hot air at the temperature of 40°C was chosen as a fluid medium, and the temperature measurements of the test points were made at the inlet and the outlet of this new type of PCM heat exchange tube. The experimental results showed that, this new type of PCM heat exchange tube could store thermal energy from the hot air by means of PCM (calcium chloride hexahydrate) in the annular area, whose performance laid good foundations for its engineering applications for recovery and utilizations of greenhouses, air conditioning and industrial afterheat or waste heat etc.
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