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Chapter: Mechanical - Gas Dynamics and Jet Propulsion - Basic Concepts and Isentropic Flows

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Concept of Gas Dynamics

Gas dynamics mainly concerned with the motion of gases and its effects .It differ from fluid dynamics .Gas dynamics considers thermal or chemical effects while fluid dynamics usually does not.

Concept of Gas Dynamics

 

Gas dynamics mainly concerned with the motion of gases and its effects .It differ from fluid dynamics .Gas dynamics considers thermal or chemical effects while fluid dynamics usually does not.

 

Gas dynamics deals with the study of compressible flow when it is in motion. It analyses the high speed flows of gases and vapors’ with considering its compressibility. The term gas dynamics is very general and alternative names have been suggested e.g.: Supersonic flow, compressible flow and aero thermodynamics etc.,

 

Significance with Applications:

 

Gas dynamics is of interest to both mechanical and the aeronautical engineers but particular field of interest of the two different .It may be said that thermodynamicist is concerned with how an object in motion influenced as it flies through still air. In contrast to it the thermodynamicist in more interested in the cases in which the object in stationary and the fluid is in motion .The applications of gas dynamics are given below.

 

·        It is used in Steam and Gas turbines

 

·        High speed aero dynamics

 

·        Jet and Rocket propulsion

 

·        High speed turbo compressor

 

The fluid dynamics of compressible flow problems which involves the relation between forse, density, velocity and mass etc.Therfore the following laws are frequently used for solving the dynamic problems.

1. Steady flow energy equation

2. Entropy relations

 

3. Continity equation

4.     Momentum equation

 

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