3 part question about concepts of influence coefficients,,heat addition and fric

Question

3 part question about concepts of influence coefficients,,heat addition and friction. I am doing a project and need to answer these questions. It is due at 4:30 so if you try to answer please do ASAP!! the questions are the following: a) if a duct has no heat addition (dT=0) or friction (f=0), explain briefly how the following flow variables, M(Mach number), V(velocity), and p0 (stagnation pressure), vary in a quasi 1-d duct. b) if the mach number is maintained constant (dM=0) in a frictional (f), constant area (dA=0) duct with heat transfer (dT not =0). Determine analytically the direction of the heat transfer for both subsonic and supersonic flow cases. Explain. c) explain analytically the meaning of the influence coefficients on the total pressure ratio

Explanation / Answer

The Inductor, also called a choke, is another passive type electrical component which is just a coil of wire that is designed to take advantage of this relationship by inducing a magnetic field in itself or in the core as a result of the current passing through the coil. This results in a much stronger magnetic field than one that would be produced by a simple coil of wire. Inductors are formed with wire tightly wrapped around a solid central core which can be either a straight cylindrical rod or a continuous loop or ring to concentrate their magnetic flux. The schematic symbol for a inductor is that of a coil of wire so therefore, a coil of wire can also be called an Inductor. Inductors usually are categorised according to the type of inner core they are wound around, for example, hollow core (free air), solid iron core or soft ferrite core with the different core types being distinguished by adding continuous or dotted parallel lines next to the wire coil as shown below. Inductor Symbols The current, i that flows through an inductor produces a magnetic flux that is proportional to it. But unlike a Capacitor which oppose a change of voltage across their plates, an inductor opposes the rate of change of current flowing through it due to the build up of self-induced energy within its magnetic field. In other words, inductors resist or oppose changes of current but will easily pass a steady state DC current. This ability of an inductor to resist changes in current and which also relates current, i with its magnetic flux linkage, N? as a constant of proportionality is called Inductance which is given the symbol L with units of Henry, (H) after Joseph Henry. Because the Henry is a relatively large unit of inductance in its own right, for the smaller inductors sub-units of the Henry are used to denote its value. For example: Prefix Symbol Multiplier Power of Ten milli m 1/1,000 10-3 micro

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