Gggggg

1. TITLE
- Determinatio of jet upper and Nozzle Efficiciency.

2. OBJECTIVE
-To determine the jet pep pill and nozzle efficiency.

3. INTRODUCTION

Nozzles are suitably shaped passages in which a facile accelerates as its pressure decreases.
If the wandering is compressible, (i.e. a gas or vapour), very high velocities can be obtained with quite moderate pressure ratios, (e.g. the local speed of buy the farm when the pressure is approximately halved).
Nozzles are vital components in a wide variety of engineering applications, such as turbines, atomic number 19 Propulsion, Rockets and Ejectors

The high velocity jet of fluid leaving a nozzle may be used in several(prenominal) ways:

In a turbine, the kinetic energy stored in the fluid forms the energy available to the
blades or the rotor for revolution to shaft work.

In rockets and jet propulsion, the change of impulsion associated with the velocity changes in the nozzle provides most of the propulsion force.

In ejectors and injectors, the changes of momentum of the jet, with its entrained fluid, is used to bring about the desired pressure changes.

The idealistic Nozzle And Nozzle Efficiency
Flow through a improve nozzle would be reversible, (i.e. without heat transfer and without frictional effects, shocks, etc.), and lead therefore be isentropic.



If thermodynamic data related to the fluid is known, the theoretical velocities and other relationships for an isentropic nozzle may be calculated. Due to the effects of friction, uncontrolled expansion, shocks etc., the velocity of the jet of fluid leaving a nozzle will be humiliate than that from an ideal nozzle.

4. THEORY

Pressure Ratio
rp=P2P1
Nozzle Efficiency
?N= veridical KE at nozzle exitIsentropic KE at nozzle exit=V2a2V2s2

P1(inlet pressure)

isentropic Process
h

Actual Process
1

P2(exit pressure)

2a

2s

S

Finding the actual velocity

Note that the air has no axial velocity when it leaves the impact head.

From Newtons Second...If you want to notice a full essay, order it on our website: Orderessay



If you want to get a full essay, wisit our page: write my essay .