An airplane, of overall length 55 ft, is designed to fl y at680 m/s at 8000-m standard altitude. A one-thirtieth-scalemodel is to be tested in a pressurized helium wind tunnel at20 ° C. What is the appropriate tunnel pressure in atm? Evenat this (high) pressure, exact dynamic similarity is notachieved. Why?

An airplane, of overall length 55 ft, is designed to fl y at680 m/s at 8000-m standard altitude. A one-thirtieth-scalemodel is to be tested in a pressurized helium wind tunnel at20 ° C. What is the appropriate tunnel pressure in atm? Evenat this (high) pressure, exact dynamic similarity is notachieved. Why?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter20: Kinetic Theory Of Gases

Section20.7: Phase Changes

Problem 20.5CE

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