Is Mach number always 1 at throat?

Since even if the flow did reach Mach 1 before the throat, it would not be able to go any faster in a still-converging duct, the Mach number at the throat cannot be greater than unity. ok so Mach at the throat will always be 1 no matter what.

Is there a maximum achievable Mach number in a convergent-divergent nozzle?

Maximum Mach number achievable in a converging nozzle is unity. For supersonic Mach numbers, a diverging section after the throat is required. However, a diverging section alone would not guarantee a supersonic flow.

When Mach number is unity at the throat of a nozzle then its velocity is?

1
As the gas passes through the throat, it attains sonic velocity (Mach number = 1). The flow rate is maximum for a given nozzle if the flow is sonic at the throat….

Mach Number	Type of flow
M = 1	Sonic flow
1.3 < M < 5	Super-sonic flow
M > 5	Hypersonic flow

In which part of a converging diverging nozzle will have unity Mach number in the chocked condition?

For chocked flow in the convergent-divergent nozzle, the Mach number at the throat is equal to 1 and the pressure at the throat is equal to the critical pressure.

What is converging nozzle?

Converging nozzles, as shown in Figure 1, are tubes with an area that decreases from the nozzle entry to the exit (or throat) of the nozzle. As the nozzle area decreases, the flow velocity increases, with the maximum flow velocity occurring at the nozzle throat.

Why is Mach 1 in nozzle throat?

When the nozzle isn’t choked, the flow through it is entirely subsonic and, if you lower the back pressure a little, the flow goes faster and the flow rate increases. As you lower the back pressure further the flow speed at the throat eventually reaches the speed of sound (Mach 1).

What is a converging diverging nozzle?

A nozzle is a relatively simple device, just a specially shaped tube through which hot gases flow. 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.

Is it possible to accelerate a gas to a supersonic velocity in a converging nozzle?

No. A diverging section needs to be added to accelerate a fluid to a supersonic velocity.

What is converging diverging nozzle?

How does a converging diverging nozzle work?

A converging diverging nozzle is placed after a subsonic combustion chamber to take the high temperature, high pressure gas, and transform it into an atmospheric pressure, high velocity gas that will provide thrust through its high momentum.

What is the maximum Mach number at the throat of a Laval nozzle?

At a throat size of 1.2 mm, the first peak of Mach numbers reaches a maximum value of 2.569. It can be seen that the peaks of the Mach numbers shift toward the chamber with the increases of the Laval nozzle throat diameters.

What is the Mach number at the throat?

At the “throat”, where the cross-sectional area is at its minimum, the gas velocity locally becomes sonic (Mach number = 1.0), a condition called choked flow.

Why can’t the Mach number at the throat be greater than unity?

At some point, the Mach number reaches unity, at which point the only way to continue to accelerate through Mach 1 is by the duct now diverging. Since even if the flow did reach Mach 1 before the throat, it would not be able to go any faster in a still-converging duct, the Mach number at the throat cannot be greater than unity.

How does the Mach number of a nozzle increase?

In a steady internal flow (like a nozzle) the Mach number can only reach 1 at a minimum in the cross-sectional area. When the nozzle isn’t choked, the flow through it is entirely subsonic and, if you lower the back pressure a little, the flow goes faster and the flow rate increases.

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 happens when you don’t choke a nozzle?

When the nozzle isn’t choked, the flow through it is entirely subsonic and, if you lower the back pressure a little, the flow goes faster and the flow rate increases. As you lower the back pressure further the flow speed at the throat eventually reaches the speed of sound (Mach 1).