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

Miller sweep generator, I want circuit diagram of miller sweep generator wi...

I want circuit diagram of miller sweep generator with components using two transistor bc547

Adder /subtractor, operation of adder/subtraction by using truthtable

operation of adder/subtraction by using truthtable

Apu powerplant installation, Apu powerplant installation: The APU engin...

Apu powerplant installation: The APU engine mounts consist of a number of supports with vibration isolators fitted to the end of each support. The tubular supports are bolted

#title. pid controller matlab coding for second order equat, can i get pr...

can i get prportional and integral controller matlab coding to solve my load flow analysis

Testing of propellers, Testing After Install After installation of a pro...

Testing After Install After installation of a propeller, the engine must be ground run in order to check the propeller for correct function and operation.  Aircraft propeller in

Coupling and cohesion, advantages and disadvantages of coupling and cohesio...

advantages and disadvantages of coupling and cohesion

Biology, Any Biology Modeling software?

Any Biology Modeling software?

Logic gate -xor gate, 'Exclusive or' gate: The basic OR gate illustrate...

'Exclusive or' gate: The basic OR gate illustrated previously in Figure 3 was seen to include the AND operation in that its output will adopt the 1 state not only when either i

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