This paper presents a numerical investigation of the effect of the rotation speed on the performance in a transonic axial compressor with the dihedral stator. Four stator geometries with different stacking line variables were tested in the flow simulations over the whole operating range. It was found that a large shroud loss at the rotor outlet and the subsequent shroud corner separation in the stator passage occurred at low mass flow rate with the 100 % design speed. The hub dihedral stator could suppress the shroud loss region and consequently improve the stall margin. In case of the 70 % design speed condition as the mass flow rate decreased, it was seen that the high loss region was placed at the midspan of the rotor passage. The dihedral stator slightly affected the local diffusion factor, but the performance of the compressor was not changed.
We proposed a quantitative empiric equation for the effect of reaction time and reaction temperature on chemical deacetylation of chitin. The mathematic formula was proved to be in good agreement with the experimental values within 1.94% of AAD. According to the estimated results by the equation, optimal reaction temperature and reaction time were 413-433K and 60 minutes or less, respectively.
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