Quiz LibraryMod-01 Lec-05 Fundamental Ideas / Normal Shock Waves
Created from Youtube video: https://www.youtube.com/watch?v=6V_JBGRCWV8video
Concepts covered:TS diagram, PV diagram, constant volume lines, isotropes, isotherms
The video discusses the depiction of state points on TS and PV diagrams, focusing on constant volume and pressure lines, isotropes, isotherms, and entropy changes. It delves into the equations for isentropic and isothermal processes, illustrating how to represent state points and stagnation states on the diagrams.
Table of Contents1.Thermodynamic Equations and Gas Properties2.Relationship between Mach Numbers in Fluid Dynamics3.Shock Wave Solutions and Entropy Changes4.Stagnation and Static Quantities in Shock Waves5.Understanding Normal Shock Waves in Fluid Dynamics
Thermodynamic Equations and Gas Properties
Concepts covered:Thermodynamic Equations, Gas Properties, Irreversible Processes, Perfect Gas Equation, Unknown Gas Properties
The chapter discusses the momentum equation, energy equation, and the change in entropy in relation to irreversible processes. It focuses on determining unknown gas properties like velocity, pressure, and temperature using the perfect gas equation of state.
Question 1
How to express P2 using the perfect gas equation?
Question 2
Why must the change in entropy be positive?
Question 3
What determines U2, P2, and T2 in this scenario?
Relationship between Mach Numbers in Fluid Dynamics
Concepts covered:Mach numbers, fluid dynamics, pressure ratio, temperature ratio, quadratic equation
The chapter discusses the relationship between Mach numbers in fluid dynamics by deriving equations for pressure and temperature ratios in terms of Mach numbers. It simplifies the momentum and energy equations to a single quadratic equation in Mach number, providing insights into the behavior of Mach numbers in different flow conditions.
Question 4
What is T2/T1 simplified with Mach numbers?
Question 5
What does p2/p1 equal in terms of Mach numbers?
Question 6
How is the momentum equation expressed with Mach numbers?
Shock Wave Solutions and Entropy Changes
Concepts covered:Shock waves, Compressive solutions, Expansive solutions, Entropy changes, Fluid flow
The chapter discusses compressive and expansive solutions of shock waves in fluid flow, emphasizing the physical significance of entropy changes. It highlights the importance of entropy increase in compressive solutions and the restrictions on expansion waves.
Question 7
What defines a compressive solution in thermodynamics?
Question 8
What differentiates Prandtl-Meyer from other wave types?
Question 9
Why is a decrease in entropy across a wave not allowed?
Stagnation and Static Quantities in Shock Waves
Concepts covered:Shock waves, Stagnation pressure, Static pressure, Frame-dependent, Velocity
The chapter discusses the relationship between stagnation and static quantities across shock waves. It emphasizes that static quantities are frame-independent while stagnation quantities are frame-dependent.
Question 10
What indicates a loss of stagnation pressure across a shock wave?
Question 11
Are stagnation quantities frame dependent?
Question 12
Is P0_2 less than P0_1 in a shock wave scenario?
Understanding Normal Shock Waves in Fluid Dynamics
Concepts covered:Normal Shock Wave, Flow Direction, Oblique Shock Waves, Mach Number, Stagnation Pressure
A normal shock wave is characterized by the absence of flow direction change before and after passing through the wave. This type of shock wave maintains a flow direction normal to the wave, leading to no deflection of the flow.
Question 13
What does a higher T2 over T1 indicate?
Question 14
Why is shock compression considered not efficient?
Question 15
Why is it termed a 'normal' shock wave?

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