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Exact(5)
Key results have shown that the mean wall temperature of the combustor with heat recuperation can be increased by 70 110 K.
Besides, the heat from exhaust gas is recycled to preheat the fresh H2 air mixture, thereby increasing the mean wall temperature.
Two variables, namely, mean wall temperature and nonuniformity coefficient of wall temperature are defined for comparing the wall temperature of the four meso-scale combustors.
The failure was due to a longitudinal crack developing in the circumferential weld joint close to the outlet end of the tube, where the mean wall temperature had reached the highest value during service.
The quadrupole sound pressure also produced during impingement on the wall is found to be smaller than the thermally induced sound by a factor proportional to M2T0/(Twhere where M, Tw, T0 respectively denote the Mach number of the vortex motion, the mean wall temperature and the fluid temperature at large distances from the wall.
Similar(55)
When the flow rate is 100 cm3/s and H2/air equivalence ratio is 0.8, the mean temperature and the wall temperature difference on the cross-sectional direction for the multiple-channel combustor are 1294.9 and 86.6 K, respectively, whereas those for the single-channel combustor are 1256.0 and 107.6 K, respectively.
In addition, mean temperature, turbulence statistics, instantaneous wall temperature distribution and Nusselt number variation are investigated.
Combustion behavior was analyzed by means of centerline and outer wall temperature distributions, amount of heat transferred through combustor wall, conversion ratio of input chemical energy to utilizable heat, and species distributions.
Namely, the mean temperature of upper and right wall is improved by about 9.66 K and 13.53 K, respectively, and the mean nonuniformity of upper and right wall temperature is reduced by about 23.24% and 26.79%, respectively.
The catalytic wall temperature is 1220 K and the incoming mixture has a mean velocity of 15 m/s and a turbulent kinetic energy of 1.5 m2/s2.
From this figure, we can see that the wall temperature (theta(0)) also decreases with increasing λ, which means that the heat transfer rate (1/theta(0)) increases as λ increases.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com