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Change of relative degradation in apparent sonic velocity VRD was used for a barometer on damage evaluation of IG and AG refractories.




 The distribution control of PCI into BF based on choking phenomena is experimentally studied by inserting Laval nozzles just after the distributor. The results show that when choking of the gas particle flow is established in the nozzle, the distribution precision is higher than that without the nozzles. The critical ratio of the pressure at the outlet to the equivalent stagnation pressure at the inlet is determined for choking to be established in the nozzle.Comparing with the two phase equilibrium flow model... The distribution control of PCI into BF based on choking phenomena is experimentally studied by inserting Laval nozzles just after the distributor. The results show that when choking of the gas particle flow is established in the nozzle, the distribution precision is higher than that without the nozzles. The critical ratio of the pressure at the outlet to the equivalent stagnation pressure at the inlet is determined for choking to be established in the nozzle.Comparing with the two phase equilibrium flow model of gas particle flow,the apparent sonic velocities of two phase flows are also obtained.  实验测定了是否安装声纳喷管条件下模拟高炉喷煤装置的煤粉流量分配精度，证明气粉两相流在声纳喷管中达到壅塞时，煤粉的分配精度较未装喷管时有很大的提高－ 分析了喷管中达到壅塞所需的条件是要喷管前后的压力比要大于临界压力比，并得出了计算临界压力比的经验式－ 将实验结论与两相平衡流理论进行比较，建立了气粉流表观音速计算公式  Based on the theoretical analysis of the choking phenomena of gaspowder flows,experiments in a horizontal constant crosssection duct are conducted with four kinds of powder:Al_2O_3,hollow Al_2O_3,Al and resin,all of which are of different densities,specific heat capacities and thermal conductivities,arriving at the relationship between the mass flowrate and inlet stagnant pressures.Applying the choking principle,the apparent critical pressure ratio (ACPR) and apparent sonic velocity (ASV) of gaspowder... Based on the theoretical analysis of the choking phenomena of gaspowder flows,experiments in a horizontal constant crosssection duct are conducted with four kinds of powder:Al_2O_3,hollow Al_2O_3,Al and resin,all of which are of different densities,specific heat capacities and thermal conductivities,arriving at the relationship between the mass flowrate and inlet stagnant pressures.Applying the choking principle,the apparent critical pressure ratio (ACPR) and apparent sonic velocity (ASV) of gaspowder flows are determined.The influences of the physical properties of powders on ACPR of gaspowder flows are obtained by the comparison between experimental results of different powders.ACPR decreases with the increase of solid/gas ratio.ACPR is mainly affected by the specific heat capacity of the powder and hardly affected by the density of the powder.  在对气粉两相流壅塞现象理论分析的基础上,选择金属铝粉、三氧化二铝粉、空心三氧化二铝粉、树脂作为固相,空气作为气相,通过气粉两相流的喷管流动实验,测定了不同粉剂不同固气比下的气粉两相流达到壅塞的临界压强比和表观音速。结果表明,表观临界压强比随固气比的增加而增加。粉剂的热容起主要作用,热容越大,表观临界压强比越大。粉剂的密度对表观临界压强比的影响很小。  Based on the theory of twophase homogeneous equilibrium model (HEM), the choking phenomena of gas?powder flow were experimentally studied and theoretically analyzed. Experiments were conducted in a horizontal constant crosssection duct with three kinds of powder: Al2O3, hollow Al2O3 and Al, with different densities, specific heat capacities and thermal conductivities, in order to understand the relationship between the mass flowrate and the inlet stagnant pressure. Applying the choking principle, the apparent... Based on the theory of twophase homogeneous equilibrium model (HEM), the choking phenomena of gas?powder flow were experimentally studied and theoretically analyzed. Experiments were conducted in a horizontal constant crosssection duct with three kinds of powder: Al2O3, hollow Al2O3 and Al, with different densities, specific heat capacities and thermal conductivities, in order to understand the relationship between the mass flowrate and the inlet stagnant pressure. Applying the choking principle, the apparent critical pressure ratio and apparent sonic velocity (ASV) of gas?powder flow were determined. Considering the thermal relaxation of the twophase flow, the effective specific heat capacity (ESHC) of solid phase, the effective isoentropic exponent (EIE) of the mixture and the relative effective specific heat capacity (RESHC) were defined. The experimental results show that, with the increase of the stagnation pressure, the mass flow rate increases as a cubic polynomial function before choking and linearly after choking. The influence of the physical properties of powders on ASV of gas?powder flow is obtained by the comparison between experimental results of different powders. When solid mass loading (SML) is small, ASV is mainly affected by the thermal conductivity of the powder. When SML is large, the density of the powder affects ASV instead. ESHC of the solid phase decreases with the increase of its loading. The thermal conductivity is the main factor to affect ESHC, while density is hardly so. ESHC of the solid phase is very small (<0.5%), and may be ignored. Therefore, the isoentropic exponent of the gas phase can be used as that of the mixture to calculate the ASV of gas?particle flow.  在均相流理论的基础上,对气粉两相流喷管的壅塞现象进行了实验考察和理论分析.选择金属铝粉、三氧化二铝粉、空心三氧化二铝粉为固相,空气为气相,通过喷管流动实验测定了不同粉剂与固气比下的气粉两相流达到壅塞的临界压强比,计算得到了表观音速等参数,并在此基础上定义了两相流的有效绝热指数和固相的有效热容.结果表明,在两相流未达到壅塞前,质量流量与滞止压强呈三次曲线关系;在壅塞后质量流量与滞止压强呈线性关系.固相的浓度和物性对气粉两相流的临界参数有明显的影响,固相的有效热容随固气比的增加而减小,随固相导热系数的增大和粒度的减小而增大;对确定的喷管和粉剂粒度,固相的相对有效热容随其导温系数的增大而增大.对常见的气粉两相流,固相对混合物热容的贡献很小,可以用气相的绝热指数按两相平衡流模型近似计算气粉两相流的表观音速.  
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