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This paper researched ethanol combustion under different oxygen concentration. Experiments show that, at 20.95% and 20% oxygen concentration, ethanol boiling in the combustion and cause the rapid increase of the flame height, similar with the combustion of alcohol burner. With the decreasing of oxygen concentration, the continuous burning time of ethanol increases. The minimum oxygen concentration...
A thermo chromic materials named Salicylaldehyde ethanolamine Schiff base was synthesized with ethanolamine and salicylaldehayde derivative in the medium of ethanol, and was characterized by means of UV-Vis absorption, GCMS. The reaction kinetics of Schiff base production was investigated through UV-Vis absorption spectra, and also the thermochromism of Schiff Base Condensed from ethanolamine and...
This paper introduced a new kind of ultra-fine water mist extinguisher, and study on total flooding extinguishing test of ultra-fine water mist extinguishing combustion of paper in confined space with the size of 2.4m×2.4m×3.5m. The results showed that the ultra-fine water mist extinguisher with the mist flux of 500ml/min was effectively in extinguishing combustion of paper in confined space. Therefore,...
The nano-silica was employed to prepare HIPS/silica nanocomposites through melt blending method. The microstructure of HIPS/silica nanocomposites was observed by transmission electron microscopy technique. The flammability of the nanocomposites was evaluated by the cone calorimeter. Digital camera and scanning electron microscopy were used to examine the macro-structure, submicro-structure and micro-structure...
Nano-MgO particles were added in epoxy with particle weight ratios of 1, 3, 5, 7 wt%. Tracking experiments were carried out by using dc voltage. The tracking process was recorded by a high speed camera. The relation of tracking failure with the adding rate and applied voltage was investigated. Obtained results indicated that with increasing adding rate from 0 to 5 wt%, number of drops needed in tracking...
Epoxy resin (EX) is widely used for insulation in electric devices, but it has a relatively low thermal conductivity. One approach to obtain a higher thermal conductivity is to introduce inorganic fillers which have high thermal conductivity. Tracking failure is a thermal breakdown phenomenon which has a close relation with the thermal accumulation. In this paper, epoxy samples with boron nitride...
Silicon rubber is widely employed as insulating materials in transmission lines due to its excellent electrical and mechanical properties. The discharges that happen inevitably during the operation of the composite insulators release too much heat that can cause electrical erosion on the surface of silicon rubber (SiR) insulators. It is known that the aim of improving the resistance to tracking and...
There are significant differences between the nuclear power plant turbine and the coal-fired power plant turbine. So the characterization and monitoring models for the coal-fired power plant turbine can not be reused in the nuclear power plant second loop. The unknown wet steam enthalpy and the characteristic of the turbine flow capacity were the two important obstacles for the nuclear power plant...
A compound-structure permanent-magnet synchronous machine (CS-PMSM) system is a hybrid-electric-vehicle power-train concept. Six typical topologies of CS-PMSMs are proposed. The characteristics of different CS-PMSMs are compared and evaluated from the aspects of torque density, manufacturability, heat-dissipating capability, and magnetic coupling. The selecting principle of different topologies is...
Based on contact heat transfer, a novel method to increase power density of piezoelectric transformers is proposed. A heat transfer structure is realized by directly attaching a dissipater to the piezoelectric transformer plate. By maintaining the vibration mode of the transformer and limiting additional energy losses from the contact interface, an appropriate design can improve power density of the...
The operation conditions have been improved via developing new technologies and improving the hardware on HL-2A tokamak in recent years. The ECRH system has been upgraded to 3 MW/68 GHz, the supersonic molecular beam injection (SMBI) fuelling technique has been developed further, and clusters can be formed in the SMB by cooling the gas to around liquid nitrogen temperature, so that deeper penetration...
Flow behavior and heat transfer performance of gas and particles in a vertical tube are modeled by means of the combination of large eddy simulations for both gas and solid phase, and the kinetic theory of granular flow for particle collisions. The subgrid-scale viscosity model and subgrid-scale thermal conductivity model for gas phase and solid phase are based on the Smagorinsky form. The predicted...
Power electronic packaging is one of the fastest changing areas of technology in the power electronic industry due to the rapid advances in power integrated circuit (IC) fabrication and the demands of a growing market in almost all areas of power electronic application such as portable electronics, consumer electronics, home electronics, computing electronics, automotive, railway and high/strong power...
The turbine flow capacity and thermal economy of regenerative system are the difficulty and key points for the monitoring and analysis system in Daya Bay nuclear power plant. Characteristics of flow area are used as the parameters to characterize the turbine flow capacity in monitoring system. And the quantitative analysis models of secondary loop thermal system is proposed using the theory of equivalent...
Based the analysis of application method, principle and previous practices of the waste water utilization from hot spring, it is found that the waste water source heat pump is a feasible energy efficient system, compared with other heat pump systems. Through the analysis and theoretical calculations of the projects in which the hot spring water source heat pumps system was adopted for heating and...
A new type of full thermal parametric model for power wafer level chip scale package (WL-CSP) is developed in this paper, which includes parametric WL-CSP and its adaptive parametric JEDEC thermal test board. By employment of the parametric model, package geometry parameters and the trace layout for PCB can easily be changed to meet the requirement of design, so that the influence of all geometry...
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