Thrust distribution Diffuser duct

Diffuser duct
13. The conditions at the diffuser duct inlet are the same as the conditions at the compressor outlet, i.e. 19,049 lb. Therefore, given that the diffuser--

Noise suppression ENGINE NOISE

ENGINE NOISE

Fig. 19-2 Exhaust mixing and shock structure.

4. To understand the problem of engine noise suppression, it is necessary to have a working knowledge of the noise sources and their relative importance. The significant sources originate in the fan or compressor, the turbine and the exhaust jet or jets. These noise sources obey different laws and mechanisms of generation, but all increase, to a varying degree, with greater relative airflow velocity. Exhaust jet noise varies by a larger factor than the compressor or turbine noise, therefore a reduction in exhaust jet velocity has a stronger influence than an equivalent reduction in compressor and turbine blade speeds.

Rolls-Royce Turbomeca Adour MK151 | Napier Gazelle

Rolls-Royce Turbomeca Adour MK151

Napier Gazelle

Rolls-Royce Turbomeca Adour MK151 The Gazelle turbo-shaft engine first ran in December 1955 at 1260 shp, a figure later increased to 1610 shp on production engines. Gazelles were used to power Bristol Belvedere and Westland Wessex helicopters. Gazelle production was taken over by Rolls- Royce in 1961.