Figure 7 Variation of modified combustion efficiency with IAR
Related Figures (10)
Fig. 1 a Actual experimental set-up, b schematic sketch of the experimental set-up with boundary condition An experimental set-up was designed and installed to conduct experiments on natural draft biomass cookstove as shown in Fig. la. The schematic sketch of the experimental set-up with the dimensions of the rocket biomass cookstove used for the work is as shown in Fig. 1b. The stove insulated with ceramic wool was kept on a calibrated weighing machine ranging from 0 stove insulated with ceramic wool was kept on a calibrated weighing machine ranging from 0 The mass burn rate of fuel was calculated by keeping the stove on the weighing machine. Time for every 0.01 kg fuel reduction was noted down for every set of IAR, from which an average time for a set of readings (f,,.) was calculated. The mass burn rate of fuel was calcu- lated as: 2.1.1 Mass burn rate of fuel Wall boundary conditions are used to bound fluid and solid regions. In viscous flows, the no-slip boundary condition is enforced at walls by default, but we can specify a tangential velocity component in terms of the translational or rotational motion of the wall bound- ary, or model a slip wall by specifying shear. The pot bottom was also treated as a wall at 100 °C. The ultimate and proximate analysis of the wood is entered into the “‘coal calcula- tor’, which is a tab under non-premixed combustion model in FLUENT software, which Table 4 Validation results allows the user to enter the properties of fuel used (by default the values are given for coal and hence named as “Coal Calculator”). The values are shown in Table 3. Fig.3 Temperature contours for different inlet area ratios, (IARs). a 0.63, b 0.67, c 0.71, d 0.74, e 0.78, f 0.84, g 0.89, h 0.92, 10.96 Experimental and CFD analysis to study the effect of inlet area... Fig.4 Variation of firepower with IAR For higher values of IAR, the amount of air entering the stove is more and hence the con- centration of CO molecules decreases partly because of additional dilution air and avail- ability of abundant oxygen for complete combustion as shown in Fig. 5. However, as the IAR goes on reducing, the CO concentration goes on increasing, due to the lesser availabil- ity of combustion air and less dilution. The temperatures obtained both by experimental Experimental and CFD analysis to study the effect of inlet area... Fig.5 Variation of CO concentrations with the inlet area ratio, IAR Fig.6 Variation of CO, concentrations with inlet area ratio, IAR Table 5 Model-predicted gas composition for varying IAR and firepower 5 Conclusion
