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Acoustic sources within the "jet pipe" also contribute to the noise, mainly at lower speeds, which include combustion noise, and sounds produced by interactions of a turbulent stream with fans, compressors, and turbine systems. [1] The jet mixing sound is created by the turbulent mixing of a jet with the ambient fluid, in most cases, air.
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The Hispano-Suiza 8 was the most produced aero engine series of World War I with 49,893 units manufactured during the conflict. The engine continued to be built in smaller numbers during the 1920s. Most of the engines were built under license in factories located in France, the United Kingdom, the United States and Italy.
The automaker says one theme simulates the sound of an internal combustion 4-cylinder engine, another offers a "high-performance sound" and the third was inspired by twin-engine fighter jets.
Aircraft engines, typically turbofans, use acoustic liners to damp engine noise. Liners are applied on the internal walls of the engine nacelle , both in the intake and by-pass ducts, and use Helmholtz resonance principle for the dissipation of incident acoustic energy.
Engines need to be sonically tuned for maximum efficiency. Noise is very similar to that of a pulse jet engine, which could cause discomfort for passengers and people on the ground. Very high engine temperatures are a problem (the engine can glow bright orange which creates an obvious material problem).
The Bristol Pegasus is a British nine-cylinder, single-row, air-cooled radial aero engine.Designed by Roy Fedden of the Bristol Aeroplane Company, it was used to power both civil and military aircraft of the 1930s and 1940s.
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