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Nozzle Area and Shape Control
In a high by-pass ratio engine with a single-stage fan without inlet guide vanes, the predominant sources governing the overall noise level are the fan and turbine. If the fan speed can be reduced without loss of thrust, then the engine noise level would be reduced. At conditions below maximum thrust, the multi-spool engine enables this to be accomplished by using a variable area nozzle to mechanically reduce the area of the hot stream final nozzle. This causes the speed of the LP turbine and its associated compressor spool to be reduced, producing a corresponding reduction in fan and turbine noise levels. However, the velocity of the hot stream will increase, producing a corresponding rise in exhaust jet noise. If the final nozzle area is reduced until the noise level of the fan, turbine and exhaust are of the same order, the optimum mean noise level for the engine will have been achieved. This normally occurs when the area of the hot stream final nozzle is reduced by approx. 50%. At the optimum nozzle area, the noise radiated towards the ground can be further reduced by a change in the geometrical shape of the nozzle.
hi I''m doing research in tool life of solid carbide endmills and I was looking at your formulas. I was wondering if tell me or where I can find the data required for these formu
Sand castings are porous enough and, therefore, cannot be used for pressure sight vessels. Structure obtained by sand casting is loose and hence not stranger than wrought products.
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The energy release rate, often denoted by G, is the amount of energy per unit area that is supplied by the elastic energy in the body and loading system in creating a new fracture
Torque indication: Turboprop and turboshaft engines do not provide significant thrust through their jet pipes, so EPR would not be of any use in determining the thrust being pr
Fluid Cleaning This procedure involves spraying an emulsive type surface cleaning fluid into the compressor whilst the engine is turning either on the starter motor or at low R
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Question 1 A large number of forecasting methods are available. Discuss the categories of forecasting methods Question 2 Explain how economic order quantity can be calculated
Source of drage Total Drag on an aerofoil is called profile drag - Skin friction • due to tangential force arising from friction - Pressure • Form - due to the inte
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