Search

This study aimed at understanding the effects of co-flow condition on lift-off characteristics of the propane jet flame. A co-flow burner system was used to provide free jet condition, air co-flow condition and vitiated co-flow condition. In vitiated co-flow, methane was the co-flow fuel, and the co-flow equivalence ratios of methane/air mixtures changed from 0.5 to 0.7. On the basis of the results, the flame issuing into air-co-flow showed a higher lift-off height compared to the flame not issuing into a co-flow (i.e. free jet condition), with a faster increment rate simultaneously. In the vitiated co-flow condition, a conversion of lift-off height changing tendency was observed with the increment of flow rate and equivalence ratio of the co-flow. As the cases remained the same equivalence ratio, the cases with lower co-flow rates showed higher lift-off heights in the early combustion period. The lift-off height increased with the equivalence ratio in the cases with low co-flow rate, however, it decreased at high co-flow rate. It could be observed in the captured images that the ignition process was accelerated with the increment of equivalence ratio and co-flow rate.

Spray characteristics of biodiesel-pentanol blends (with 0 v/v%, 10 v/v%, 20 v/v%, 30 v/v% and 40 v/v% pentanol) were investigated and compared with those of diesel in this work. Experiments under a variety of working conditions were carried out on a common-rail system and a constant volume chamber. High-speed Schlieren photography was used to capture the spray images. The analysis revealed that biodiesel and diesel showed the longest and the shortest spray tip penetration, the smallest and the largest spray cone angle, the smallest and the largest R (ratio between the liquid core area and the spray area), respectively. As the percentage of pentanol increased, the spray tip penetration of biodiesel-pentanol blends decreased, while the spray cone angle and R increased. BDP40 (60% biodiesel and 40% pentanol) showed similar spray characteristics as that of diesel. The comparison of tip velocities also showed that pentanol would reduce the initial axial momentum of injected fuels. Biodiesel showed the largest initial axial momentum while diesel owned the smallest one. Additionally, spray structures of blended fuels were more likely to fluctuate compared to biodiesel and diesel. The empirical equations of H-A model were used to verify the experimental results and showed great agreement between experimental results and predicts.

This work aimed to figure out the liftoff characteristics of ethylene and ethane, which are both promising fuels in the new energy era for flames in coflow. A free jet condition, air coflow...

Combustion behaviors and carbon monoxide emission characteristics of four kinds of coals and their blends, which were shaped into pellets, were investigated in a drop-tube furnace with vari...

A novel method by integrating the color information and bilinear interpolation with the traditional fast tracking via spatio-temporal context learning (STC) called as C-STC is presented. Experimental results with variant videos show that the improved algorithm can track the object accurately compared with the traditional STC, Particle Filter (PF) and Multiple Instance Learning (MIL). Moreover, multi-core emulation experiments have been conducted based on TMDXEVM6678L. Synchronization and communication between cores are realized based on the MessageQ. Two modes of data transmission from PC to DSP are achieved. The results show that the transmission via network promotes the real-time performance, which laying the foundation for communication between the DSP and the gigabit ethernet camera.

With the bursting development of computer science and mobile devices, the combination of education and recent techniques is urgently needed. In view of the existing mobile learning system interactive poor, renewable resources, shortcomings and so on big data traffic, this paper puts forward a kind of mobile learning system based on Android platform. The system can not only solve the above problem, also can easily implement integration and extension. With the rapid popularization of smart mobile terminals, mobile study become a hot spot, the trend of traditional live remote education system puts forward a new challenge. Therefore, in this paper, we undertake research on British and American literature learning platform based on Android mobile systems. We modify the framework of the current Android system and re-design the user interface. The simulation result shows the system is user-friendly and stable.