Abstract
An experimental study has been performed in an attempt to seek some possibilities of obtaining the solutions of heat transfer problems related to rotor-stator disk cavity systems of gas turbine engines by analogy with corresponding problems in mass transfer which arises from using naphthalene sublimation technique. Measurements are made to examine the effects of rotational Reynolds number, the flow rate and the gap ratio on the radial pressure distributions. Pressure inversion phenomenon has been verified to exist for the case of shrouded disks with radial clearance, which perform better in terms of heat transfer, too, than those with axial clearance. The stator flow reattachment points are determined directly by the dual sensor pressure probes and compared well with those estimated from the distributions of static pressure and mass transfer coefficients.
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Abbreviations
- Cw :
-
m/μr0 flow coefficient
- D:
-
disk diameter
- Dnaph :
-
diffusion coefficient of the naphthalene
- G:
-
gap ratio (s/r0)
- Gea :
-
axial clearance ratio (axial clearance/s)
- Gcr :
-
radial clearance ratio (radial clearance/s)
- h m :
-
mass transfer coefficient
- m :
-
mass flow rate
- P:
-
static pressure
- Patm :
-
atmospheric pressure
- Reω :
-
\(\omega r_0 ^2 /\nu \)=Reynolds number
- r0 :
-
disk radius
- s:
-
gap between rotor and stator
- Sh:
-
Sherwood number (hmD/Dnaph)
- μ:
-
viscosity
- ν:
-
kinematic viscosity
- ω:
-
angular velocity (rad/s)
References
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Kim, H.C., Yoo, J.Y., Kang, H.S. et al. Experimental study on flow and mass transfer in rotor-stator disk cavities. KSME Journal 9, 515–524 (1995). https://doi.org/10.1007/BF02953650
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DOI: https://doi.org/10.1007/BF02953650