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

What is call option?, What is Call Option? Calls give the client the rig...

What is Call Option? Calls give the client the right but not the responsibility to buy a given variety of the actual resource, at a given cost on or before a given upcoming time

Mechanism for dislocation in plastic deformation, Q. Explain the mechanism ...

Q. Explain the mechanism for dislocation in plastic deformation. Ans.  Stresses are acting on dislocation in a crystal that is known as stress field, due to these stress forc

Replacement analysis of cash flow, Replacement Analysis In the previous...

Replacement Analysis In the previous chapter we have compared various investment alternatives. Two scenarios were considered: single alternative and a set of mutually exclusive

Transistor configurations, TRANSISTOR CONFIGURATIONS: Before a transist...

TRANSISTOR CONFIGURATIONS: Before a transistor can be used, it must be connected into an input circuit (by two wires) and an output circuit (two wires).  However, because the t

Financial management, The role of financial managers in the changing econom...

The role of financial managers in the changing economic scenario

What is risk management, Defined risk management Give suitable examples of...

Defined risk management Give suitable examples of risk management Explain beifly

Fire evacuation - railway inspections, Fire evacuation - Railway inspection...

Fire evacuation - Railway inspections: Fire evacuation signals should be given by voice messages and these must be easily understood by the occupants. The expected populati

Rake angle, the effect when side relief angle is too much

the effect when side relief angle is too much

Airflow control system principles-aircraft engine, Airflow control system p...

Airflow control system principles: For any given engine there is only one set of conditions, mass flow, pressure ratio and rpm, at which all the compressor components are opera

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