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Transonic Wind Tunnel for Investigation of Turbomachinery Blades


Dolait, Jean-Pierre (1972) Transonic Wind Tunnel for Investigation of Turbomachinery Blades. Engineer's thesis, California Institute of Technology. doi:10.7907/4D2K-SR72.


The design of a two-stream wind tunnel was undertaken to allow the simulation and study of certain features of the flow field around the blades of high-speed axial-flow turbomachineries. The mixing of the two parallel streams with designed Mach numbers respectively equal to 1.4 and 0.7 will simulate the transonic Mach number distribution generally obtained along the tips of the first stage blades in large bypass-fan engines.

The GALCIT hypersonic compressor plant will be used as an air supply for the wind tunnel, and consequently the calculations contained in the first chapter are derived from the characteristics and the performance of this plant.

The transonic part of the nozzle is computed by using a method developed by K. O. Friedrichs. This method consists essentially of expanding the coordinates and the characteristics of the flow in power series. The development begins with prescribing, more or less arbitrarily, a Mach number distribution along the centerline of the nozzle. This method has been programmed for an IBM 360 computer to define the wall contour of the nozzle.

A further computation is carried out to correct the contour for boundary layer buildup. This boundary layer analysis included geometry, pressure gradient, and Mach number effects. The subsonic nozzle is calculated {including boundary layer buildup) by using the same computer programs. Finally, the mixing zone downstream of the splitter plate was investigated to prescribe the wall contour correction necessary to ensure a constant-pressure test section.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:Aeronautics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Zukoski, Edward E. (advisor)
  • Kubota, Toshi (co-advisor)
  • Marble, Frank E. (co-advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1971
Record Number:CaltechTHESIS:01062016-155803211
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9360
Deposited By: Benjamin Perez
Deposited On:28 Jan 2016 21:28
Last Modified:27 Jul 2021 18:16

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