Nozzle area and shape control, Other Engineering

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.

2168_Nozzle Area and Shape Control.png

Posted Date: 9/12/2012 2:05:59 AM | Location : United States







Related Discussions:- Nozzle area and shape control, Assignment Help, Ask Question on Nozzle area and shape control, Get Answer, Expert's Help, Nozzle area and shape control Discussions

Write discussion on Nozzle area and shape control
Your posts are moderated
Related Questions
Fourier’s law of heat conduction For one dimension; q(x) = - k dT/dx (2.1) wher

Fire safety management for restaurants: Staff in restaurants must be aware that customers who have been served their food are always reluctant to leave that food and evacuate.

what are the merits and demerits of free radical

The self lubricating bearing is a typical application of metal powder parts or powder metallurgy process. The self lubricating bearings made from brass, iron, aluminium bronze etc,

Q . Write short note on blow molding. OR Explain the Thermoforming process.   What are the plastic fabrication method write in brief with neat sk


Why would an investor buy preferred stock? A buyer that wants the benefit potential of value but wants to reduce possibility would buy recommended inventory. The buyer would rec

Aviation legislation - MAXIMUM TAKE-OFF MASS: Aircraft companies intending to manufacture a new design must have approval under Chapter A8-1 of BCAR or JAR-21 (Certification Pr

Assignment on Risk and Return# Stock has beta of 1.5 & an expected return 11%. A risk free asset earns 2%. Determine the expected return on a portfolio that is equally invested in

Seekers   There are two main types of sensor used in autonomous vehicles (seekers and position/attitude sensors) - although not all systems have both.            - Airc