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The time-averaged velocity fields were approximately self-similar, with the highest mass flow exhibiting a central recirculation zone (CRZ) with a slightly larger diameter.
The group C fluids have the highest mass flow rates from 0.213 kg/s to 0.230 kg/s, the required heat supplies from 32.30 kW to 40.54 kW, the system efficiencies from 5.07% to 6.36% and the lowest CHP efficiencies from 71.31% to 72.33%.
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Higher mass flow rates lead to greater thermal performance but also to higher pressure losses.
It is obvious that higher mass flow rate leads to greater thermal efficiency.
In general terms, lower mass flow works to increase reaction rates while higher mass flow works to reduce them.
Uneven distributions were observed for high mass flow rates at the cathode manifold without baffle.
Thus the nozzle forces a higher mass flow rate of air through the turbine.
Moreover, it is noticeable that the distance between the curves of Fig. 5 is greater for higher mass flow rates.
It was also confirmed that the high mass flow rate enhanced the performance despite the increased unnecessary mixing effect.
The increased efficiency can be attributed to reduced conductive, radiative, and convective losses at the higher mass flow rates.
For compressor and turbine, steady situations are fairly described, especially for medium and high mass flow rate.
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