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

Plane transmission diffraction grating, A diffraction grating is an optical...

A diffraction grating is an optical element that diffracts light into its constituent wavelength (colors). It is an excellent device used in laboratory to study the spectra. Co

Agricultural engineering , Agricultural engineering does not easily mean on...

Agricultural engineering does not easily mean only fruits and vegetables formed from the fields. Agriculture has come up with a dissimilar  look now. When you open a paouch of chip

Deadlock based problem in operating system, Deadlock based problem in opera...

Deadlock based problem in operating system# Deadlock usually occurs between a known set of processes that end up waiting on each other. If we cannot prevent or avoid deadlock, anot

Calculate the relative load of mobile broadband subscribers, Question: ...

Question: (a) A mobile operator wants to weigh and allocate cost towards mobile broadband subscribers with mobile broadband at 80% of the traffic and 15% of the subscribers. H

Detection and removal of shadow from an image, plz give an exact method for...

plz give an exact method for the detection and removal of shadow from an image

Counter, Design a recycling MOD 19 up counter using JK FFs. In your design,...

Design a recycling MOD 19 up counter using JK FFs. In your design, include the logic circuit diagram and the timing diagram output that counts from 000002 = 010 to 100112 = 1910. C

Q1, 5) Dupree Funds is considering the fees charged by two banks. First Ame...

5) Dupree Funds is considering the fees charged by two banks. First America charges a flat rate of $0.11 per payment and First Western requires a deposit of $500,000 (that does not

Modified accelerated cost recovery system , Modified Accelerated Cost Recov...

Modified Accelerated Cost Recovery System (MACRS) Although SLN is the most commonly used depreciation method in the U.S. for purpose of financial reporting, MACRS is the only

FISICA, EL DESPLAZAMEINTO DE UNA PARTICULA ESTA DADO POR S=(-2+3T)e¨-0.5t

EL DESPLAZAMEINTO DE UNA PARTICULA ESTA DADO POR S=(-2+3T)e¨-0.5t

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