Choked nozzle and thrust correction - turbojet, Other Engineering

Assignment Help:

Choked Nozzle

Considering the formula for thrust under "choked" nozzle conditions:
Thrust =(P-P0 )A + WVj /g    

Where: P = Pressure
P = Ambient Pressure
A = Area
W = Mass Flow
V = Velocity

It can be seen that the thrust can be further affected by a change in the mass flow rate of air through the engine and by a change in jet velocity. An increase in mass airflow may be obtained by using water injection to cool the air and increases in jet velocity by using after-burning.

Changes in ambient pressure and temperature considerably influence the thrust of the engine. This is because of the way they affect the air density and hence the mass of air entering the engine for a given engine rotational speed.

Thrust Correction - Turbojet

To enable the performance of similar engines to be compared when operating under different climatic conditions, or at different altitudes, correction factors must be applied to the calculations to return the observed values to those which would be found under I.S.A. conditions. For example, the thrust correction for a turbo-jet engine is:


Thrust (lb) (corrected) = thrust (lb) (observed) x 30/Po
• Where P0 = atmospheric pressure in inches of mercury (in Hg) (observed) 

30 = I.S.A. standard sea level pressure (in Hg)

 


Related Discussions:- Choked nozzle and thrust correction - turbojet

Designing a phone, hi um how do people design phones and stuff like da

hi um how do people design phones and stuff like da

Dsp, h(t) is an analog IIR filter, with the poles lambda_1 = -1, lambda_2 =...

h(t) is an analog IIR filter, with the poles lambda_1 = -1, lambda_2 = -1+i, lambda_3 = -1-i and no zeros. let h[n] be a digital IIR filter with poles which defined by e^lambda_i a

Fuel flow metering-aircraft engine, FUEL FLOW METERING: Fuel flowmeters...

FUEL FLOW METERING: Fuel flowmeters are fitted in aircraft to give an accurate indication of the rate at which fuel is being used and the total amount of fuel that has been use

Fuel system inhibiting, Fuel system inhibiting. The fuel used in turbi...

Fuel system inhibiting. The fuel used in turbine engines usually contains a small quantity of water which, if left in the system, could cause corrosion. All the fuel should th

Inheritance and polymorphism, The objective of this programming assignment ...

The objective of this programming assignment is to experience the use of inheritance in Java and to see how polymorphism works with inheritance in Java. The assignment involves wri

Dam engineering, How do we classify the principal planes as minor and major...

How do we classify the principal planes as minor and major principal planes?

Engine indication systems in aircraft, Engine indication systems in Aircraf...

Engine indication systems in Aircraft: Engine indications are very important to the crew of a powered aircraft, as they indicate one of the primary parameters needed for flight

Fire prevention – bays or zones, Fire prevention – bays or zones: To pr...

Fire prevention – bays or zones: To prevent the spread of a fire within an aircraft/engine nacelle, it is divided up into sections or zones, each being separated by a fireproof

Heat exchanger designing, How to design heat exchanger project from aromati...

How to design heat exchanger project from aromatics from shale gas transport phenomena, CHE 306

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd