Question About the Steam Turbine

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It is heat energy being converted to mechanical energy, being converted into electrical energy, and eventually back into heat energy.....The medium of conversion is steam which when heated expands, this creates pressure which creates flow...anything impeding the flow creates a low pressure area behind the object....this creates force which turns the turbine....

Either, both. It's the change in state/conditions that make the difference. Any time you start at a higher pressure, velocity, temperature, potential energy, kinetic energy, etc. and end at a lower state, etc.etc., you have extracted, converted, moved, etc. energy.

Some physical chemists (and others) like to refer to the expansion in any turbine as PV work produced (pressure-volume work), as this relates to the thermodynamic properties and mathematics, but it can and is also referred to as an entropy engine, a pseudo-carnot engine, etc. Engineers prefer to think in terms of mass flow, since mass flow for a given set of boundary conditions defines the output of a given turbine.

Next question: Is a constant volume turbine (see RamGen) that utilizes supersonic compression (in the shock wave) and combustion of premix fuel-air classified as an impulse turbine or as a reaction turbine, because I would not expect it to be both, oh and by the way there is only one wheel (no stages), yet highly efficient.

It is enthalpy , h=u+pv where u=internal energy, afunction of temperature, p=pressure and v=volume. during flow of steam enthalpy gets reduced and is converted to useful work as pressure reduces in fixed blades (diaphragm) in impulse turbineand gets converted to velocity. In reaction turbine, pressure gets converted to velocity in fixed blades as well as moving blades. The steam with kinetic energy acts on the moving blades and imparty motipon to it. This is converted to electrical energy in the generator. So, it is enthalpy that finally gets converted to elctrical energy. The higher the enthalpy of the steam entering turbine, the higher is the energy available for conversion to electrical energy.

Velocity and flow are both by-product functions of pressure applied to an impedance/resistance/restriction(s).

Pressure and quantity of steam flow determine the amount of force (horsepower/BTU) applied to the turbine vanes to create prime mover rotation of the generator/alternator rotor.

Yes, pressure is (acts as) the primary factor of mechanical energy causing the reaction that produces turbine & alternator rotation (input).

Pressure and velocity are related. There is no flow without a pressure differential.

Since pressure depends on the steam temperature, then that is the main item in the study of how steam converts heat energy into mechanical energy in a turbine.

Your approach to the question is somehow wrong. You should have a course in thermodynamics etc...Entropy ... Enthalpy ... Molier's Diagram ...to better understand the topic of converting heat energy to mechanical energy, using a turbine or a steam Engine in general.