Aerodynamic Noise: An Introduction for Physicists and by Tarit Bose

By Tarit Bose

Aerodynamic Noise widely covers the theoretical foundation and mathematical modeling of sound, in particular the bad sounds produced by way of airplane. This noise may come from an aircraft’s engine—propellers, enthusiasts, combustion chamber, jets—or the motor vehicle itself—external surfaces—or from sonic booms. nearly all of the sound produced is because of the movement of air and its interplay with reliable obstacles, and this can be the most dialogue of the ebook. With challenge units on the finish of every bankruptcy, Aerodynamic Noise is perfect for graduate scholars of mechanical and aerospace engineering. it can even be invaluable for designers of vehicles, trains, and wind turbines.

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Secondly, the combustion process causes a change in the noise pattern, which may be called indirect combustion noise. A third tentative mechanism is the creation of noise by the convection of hot spots generated by the combustion process, which may be called the entropy noise. It is known that below a certain jet velocity, say 300 m/s in turbopropulsion systems, this noise due to combustion may tend to become more important, behaving basically as monopole sources. For a supersonic flying aircraft, shocks generated at the bow and tail of the aircraft may generate a big sonic boom.

41) then 2π ψ =0 expjky sin θ cos ψ dψ = 2π ψ =0 ∞ (jky sin θ cos ψ )n dψ n! n=1 1+ ∑ ∞ (jky sin θ )n n! n=1 = 2π + ∑ 2π ψ =0 cosn ψ dψ = 2π Jo(ky sin θ ). 42) where J1 is the Bessel function of first order, J1 = 1 ϕ3 ϕ5 ϕ− + ∓ ... 43) Further, the term between the [ ] is the directivity factor for acoustic radiation of the pulsating piston. It can be shown that F(θ ) is zero for some values of sin θ , and there is no radiation in that direction (Fig. 3). This was shown in Fig. 4. As a result, the intensity distribution for a pulsating piston is shown in Fig.

3 Spherical Wave Propagation In the previous subsection we investigated the case of a pulsating sphere in a very simple manner without considering the manner in which the sound wave was propagated from the sphere. This will now be reexamined by considering the propagation of the wave with a view to applying the equations to the example that will follow. We now examine the propagation of a simple harmonic spherical wave from the surface of a fluctuating sphere. 13) where A is a constant representing the amplitude of the pressure fluctuation.

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