Revised scheme for B.Tech. - Punjab Technical University

PTU/BOS/ME/101/10-06-2005/BATCH-2003
DE/ME-1.9 GAS DYNAMICS
Internal Marks: 40 L T P
External Marks: 60 3 1 0
Total Marks: 100
1. Basic concepts of Gas Dynamics and Gas Properties:
Definition: Units and dimensions. The concepts of continuous, properties of the
continuum. Methods of describing fluid motion, Lagrangian method. Eulerian Method.
The integral form of the equations of Conservations of Mass. Momentum and energy
as applied to Control Volumes, applications to the study flow of inviscid compressible
fluids.
b) Fundamentals Equations Study of One Dimensional Flow :
Continuity equation, the momentum equation, the dynamic equation and Euller’s
equation. Bernoulli’s equation, thrust function, steady flow energy equation.
c) Isentropic Flow:
Introduction, Acoustic velocity, Mach number, Mach line and Mach angle.
Classification of flows, Karman’s rules supersonic flow, flow parameters, Critical
conditions stagnation values.
d) Flow in Ducts with Heating or Cooling:
Stagnation temp. change, governing equations, Rayleigh lines, choking effects in
simple to change. Maximum heat transfer.
e) Flow in constant- Area Ducts with friction:
Friction loss, the friction parameter, Fannolines, effect of the increase of inlet Mach
number and duct length. Chocking due to friction.
Isothermal flow through long ducts.
f) Normal Shock Waves:
Formation of shock waves, weak waves, compression waves. Governing relations of
the Normal shock, Pressure. Temperature, Density, Mach number across shock.
g) Oblique shocks: Oblique shock equations, shock geometry, shock polars.
h) Flow through Nozzles:
The Converging diverging nozzle, area ratio for complete expansion, effect of varying
back pressure on nozzle flow. Under-expansion and over-expansion in nozzle flow.
Losses in nozzle.
i) Flow through Diffusers:
Classification of diffusers, internal compression subsonic diffuser, velocity gradient,
effect of friction and area change, the conical internal-compression subsonic diffuser,
external compression subsonic diffuser, supersonic diffuser, normal shock
supersonic diffuser, the converging diverging supersonic diffuser.
j) Introduction to Multidimensional Flow:
The equation of continuity, the momentum equations, Bernoulli,s equation, the
energy equation, Navier-Stock’ Equations, Potential Flow.
Books
i. Thermodynamics of Compressible Fluid flow by Shaprio.
ii. Computational Gas Dynamics by Culbert B. Laney, Cambridge
University Press