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

Matlab assignment, can you formulate a program using only bubblesort for as...

can you formulate a program using only bubblesort for assigning grades in an array?

Students industrial work experience, Where are the recomended areas or indu...

Where are the recomended areas or industries where an Agricultural Engineering Student can apply for industrial training?

Application to the axial flow compressor, APPLICATION TO THE AXIAL FLOW COM...

APPLICATION TO THE AXIAL FLOW COMPRESSOR: In order for the compressor to deliver a high mass airflow for a minimum effort required to drive it, it is important that all the com

Full-authority digital electronic control, Full-authority digital electroni...

Full-authority digital electronic control: The supervisory control was a step toward the full-authority, fully redundant EEC. It controls all engine functions and eliminates th

Basic instrumentation system, A basic instrumentation system consists of a ...

A basic instrumentation system consists of a transducer, conditioning amplifier, and analog digital converter connected (in general) by analog and digital transmission lines.

Wireless sensor networks, can we construct a body area sensor network in ma...

can we construct a body area sensor network in matlab as in ns-2.

Longitudinal trim, A trimmed flight condition is perhaps best thought of as...

A trimmed flight condition is perhaps best thought of as an equilibrium condition. The simplest trim condition is straight-and-level flight, in which the forces (weight, propulsive

. CFD, HOW TO MAKE ROTATING FRAME

HOW TO MAKE ROTATING FRAME

Assignment , I want help for the circuit theory

I want help for the circuit theory

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