What is the advantage of the convergent-divergent nozzles?

In convergent-divergent type of nozzles we can increase the flow velocity much higher than sonic velocity that is why these type of nozzles have a wide applications such as propelling nozzles in jet engines or in air intake for engines working at high rpms.

What is the difference between convergent nozzle and divergent nozzle?

Nozzles can be described as convergent (narrowing down from a wide diameter to a smaller diameter in the direction of the flow) or divergent (expanding from a smaller diameter to a larger one).

How does a convergent-divergent nozzle work?

This nozzle configuration is called a convergent-divergent, or CD, nozzle. In a CD nozzle, the hot exhaust leaves the combustion chamber and converges down to the minimum area, or throat, of the nozzle. The exit velocity, pressure, and mass flow through the nozzle determines the amount of thrust produced by the nozzle.

How does a convergent nozzle work?

A convergent nozzle is a nozzle that starts big and gets smaller-a decrease in cross-sectional area. As a fluid enters the smaller cross-section, it has to speed up due to the conservation of mass. To maintain a constant amount of fluid moving through the restricted portion of the nozzle, the fluid must move faster.

Why convergent-divergent nozzle is used in steam turbine?

To increase the velocity magnitude for momentum source in rotating power turbine, a compressible fluid e.g. steam could reach the supersonic flow through the convergent- divergent nozzle (CD-nozzle). A throat section, between inlet and outlet sections, controls the outlet Mach when velocity in sonic condition.

Why does velocity increase in divergent nozzle?

In divergent portion of nozzle , specific volume of fluid increases at a higher rate than the crossectional area along the divergent portion. So to maintain constant mass flow rate (M=A*V*density), velocity of flow increases reaching Mach numbers greater than one.

Why convergent divergent nozzle is used in steam turbine?

How does a Laval nozzle work?

The gas flow through a de Laval nozzle is isentropic (gas entropy is nearly constant). As the gas exits the throat the increase in area allows for it to undergo a Joule-Thompson expansion wherein the gas expands at supersonic speeds from high to low pressure pushing the velocity of the mass flow beyond sonic speed.

What is divergent nozzle?

[də′vər·jənt ′näz·əl] (design engineering) A nozzle whose cross section becomes larger in the direction of flow.

Where are the convergent nozzles used?

Convergent nozzles are used for subsonic and sonic flows. They can also be used as flow measuring and flow regulating devices. Convergent-Divergent nozzles are used for Supersonic flows. It is comparitively difficult to obtain convergent-divergent passages in compressors and turbine blade rows.

What is a convergent divergent nozzle?

This nozzle configuration is called a convergent-divergent, or CD, nozzle. In a CD nozzle, the hot exhaust leaves the combustion chamber and converges down to the minimum area, or throat, of the nozzle. The throat size is chosen to choke the flow and set the mass flow rate through the system.

What is a CD nozzle?

A nozzle is a relatively simple device, just a specially shaped tube through which hot gases flow. Ramjets and rockets typically use a fixed convergent section followed by a fixed divergent section for the design of the nozzle. This nozzle configuration is called a convergent-divergent, or CD, nozzle.

What type of nozzle is used in a rocket?

Ramjets and rockets typically use a fixed convergent section followed by a fixed divergent section for the design of the nozzle. This nozzle configuration is called a convergent-divergent, or CD, nozzle. In a CD nozzle, the hot exhaust leaves the combustion chamber and converges down to the minimum area, or throat, of the nozzle.

What determines the amount of thrust produced by the nozzle?

The exit velocity, pressure, and mass flow through the nozzle determines the amount of thrust produced by the nozzle. On this slide we derive the equations which explain and describe why a supersonic flow accelerates in the divergent section of the nozzle while a subsonic flow decelerates in a divergent duct.