Contours of entropy and velocity perturbation vectors.

<p>Contours of entropy and velocity perturbation vectors.</p

Distribution of relative loss coefficient along blade span of two rotors.

<p>(a) rotor 1; (b) rotor 2.</p

View of contra-rotating fan.

<p>View of contra-rotating fan.</p

Contours of entropy and velocity perturbation vectors with respect to different axial spacing.

<p>Contours of entropy and velocity perturbation vectors with respect to different axial spacing.</p

The set-up drawing of out-gas experiment.

<p>The set-up drawing of out-gas experiment.</p

RMS pressure of two rotors with different axial spacing.

<p>(a) rotor 1; (b) rotor 2.</p

Independent verification of mesh number.

<p>Independent verification of mesh number.</p

Distribution of relative loss coefficient along blade span of two rotors with respect to different axial spacing.

<p>(a) rotor 1; (b) rotor 2.</p

Blade aerodynamic force fluctuation with different axial spacing.

<p>(a) rotor 1; (b) rotor 2.</p

Computational mesh of contra-rotating fan.

<p>Computational mesh of contra-rotating fan.</p