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At planar nozzles an (x/H exit of 2.1 was more suitable for decreased of total pressure losses, while at circular nozzles the shock waves were canceled inside of divergent section.
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The TAN concept overcomes conventional engine limitations by injecting propellants and combusting in an annular region in the divergent section of the nozzle.
Nucleation was observed in the throat area and divergent section of the nozzle for mass flow rates from 0.050 kg/s to 0.065 kg/s, inlet pressure from 7.8 to 7.4 MPa for fixed exit pressure equal to 7.28 MPa.
The tandem replication slippage sequentially homogenized sequences between duplications [ 19], therefore this mechanism cannot account for the observation in most ardeid species, where the homogenized duplications were interrupted by a divergent section nesting in the middle of CR domain I.
However, it should be stressed that this largest entrainment ratio corresponding this optimum divergent section length differs little from the non-optimum value which means we can design the divergent section with a wider range of the length.
The entrainment ratio increases slowly first with the divergent section length to its maximum and then decreases gradually due to the increase of flow frictional drag.
All nozzles had rectangular geometry at throat, while 3 had divergent section planar and 2 divergent section circular, considering each mass flow rate (55 and 70 kg h−1).
It was also disclosed that the divergent section length has only a comparatively weak effect on the ejector performance.
The optimal expansion ratio is influenced by the gas conditions, particle size, nozzle divergent section length and throat diameter.
Hence there also exists an optimum value for the divergent section length at which the steam ejector performs best.
However, near the walls, a high liquid-content two-phase region was detected, first in the divergent section.
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