# Rayleigh Flow and Stagnation Conditions

• JuanR43
In summary, the problem in question involves determining the values of various conditions such as static temperature, static pressure, stagnation temperature, stagnation pressure, and flow velocity at the inlet and exit of a constant area duct. The duct is being supplied with standard atmospheric air at a constant rate and is heated with a diabatic process. The question is whether the stagnation temperature at the inlet is equal to the ambient temperature, and if so, why. The solution involves considering conditions such as To*, To,1, and To,2, and determining the relationship between them.
JuanR43

## Homework Statement

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The question I want to ask is how do you relate conditions such as To* and To,1 and To,2, where To,1 and To,2 are the stagnation conditions at the entrance and exit.

This is the problem I was doing.

Standard atmospheric air is drawn steadily through an isentropic converging nozzle into a frictionless diabatic (q = 500 kJ/kg) constant aread duct. For max flow, determine the values of static temperature, static pressure, stagnation temperature, stagnation pressure, and flow velocity at the inlet [section(1)] and exit [section(2)] of the constant area duct.

## The Attempt at a Solution

I know that for maximum flow, To,2 = To*, but I'm not sure if it's due to the fact it's coming in supersonically and because of the heating involved or am I completely off. I also ran into a problem where To,1 = To*

is also true, meaning that the stagnation temperature at the inlet is equal to the ambient temperature. Is this correct?Thanks for your help!

## 1. What is Rayleigh Flow and how is it different from other types of flow?

Rayleigh Flow is a type of compressible flow that occurs when a gas or fluid moves through a diverging or converging nozzle. It is different from other types of flow because it takes into account the changes in gas properties, such as temperature and density, due to changes in speed and pressure.

## 2. What are the key assumptions made in Rayleigh Flow analysis?

In Rayleigh Flow analysis, it is assumed that the flow is steady, one-dimensional, and inviscid (no friction). It is also assumed that the gas or fluid is a perfect gas and that the flow is adiabatic (no heat transfer).

## 3. How is stagnation pressure and temperature related to Rayleigh Flow?

In Rayleigh Flow, the stagnation point is the point where the flow velocity is zero and the pressure and temperature are at their maximum values. This is also known as the stagnation pressure and temperature. As the flow expands or compresses, the stagnation pressure and temperature will decrease or increase, respectively.

## 4. How does the Mach number affect Rayleigh Flow?

The Mach number, which is the ratio of the flow velocity to the speed of sound, plays a crucial role in Rayleigh Flow. As the Mach number increases, the flow becomes more compressible and the changes in gas properties become more significant. At a Mach number of 1, the flow is said to be at sonic conditions, where the speed of the flow is equal to the speed of sound.

## 5. What are some practical applications of Rayleigh Flow and Stagnation Conditions?

Rayleigh Flow and Stagnation Conditions have many practical applications, such as in supersonic and hypersonic aircraft design, gas turbine engines, and rocket propulsion systems. They are also used in the design and analysis of wind tunnels and other aerodynamic testing facilities.

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