Aerodynamics for Engineers, by John J. Bertin

By John J. Bertin

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176 kg/m3. 4 for air. If the pressure decreases to one-third of its original value, what happens to the density? 176 kg/m3, what is the final density? 12a) for dynamic viscosity] at an altitude 15 km. 13)] and speed of sound for a thermally perfect gas? The pilot announces that you are flying at an altitude of 10 km where stagnation temperature is measured to be 625 K, find the speed of aircraft. 2 to obtain the values for the temperature and speed of the sound. 3 K. Using the perfect-gas relations, what are the corresponding values for the test-section density, viscosity, and velocity?

NACA Tech. Note 4265 Svehla RA. 1962. Estimated viscosities and thermal conductivities of gases at high temperatures. Report R-132 1976. S. Standard Atmosphere. S. Government Printing Office Werner J. 2005. Knight of Germany: Oswald Boelcke – German Ace. Mechanicsburg: Stackpole Books Yos JM. 1963. Transport properties of nitrogen, hydrogen, oxygen, and air to 30,000 K. AVCO Corp. RAD-TM-63-7 2 FUNDAMENTALS OF FLUID MECHANICS Chapter Objectives • Understand the physical laws that form the basis of the fluid equations of motion • Learn how to obtain the equations of fluid motion in both derivative and integral form • Be able to apply the equations of motion to calculate properties of fluid flows • Understand dynamic similarity and how to calculate Mach number and Reynolds number • Understand the various Mach and Reynolds number regimes and their distinguishing characteristics As we discussed in Chapter 1, to accurately predict the aerodynamic forces and moments that act on a vehicle in flight, we will need to be able to describe the pattern of flow around the configuration.

Viscosity, density, and speed of sound) that have been presented in this chapter. The reader should note that it may be necessary under certain conditions to use alternative relations for calculating fluid properties. , dissociation). , Moeckel and Weston (1958), Hansen (1957), and Yos (1963)], but in this book we will concentrate on speeds and altitudes where this will not be necessary. Also, we have looked at how the atmosphere can be modeled in order to perform consistent 38 Chap. 1 / Why Study Aerodynamics?

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