No sure here what JJ is saying about PV where V is velocity?
Multiplying Pressure by Velocity doesn't appear to be a very useful product to me. J.J. is usually pretty good on this stuff too.
The old equations are : P1. V1/T1 = P2.V2/T2 or, alternatively, P. V to the power n is a constant, where P is the absolute Pressure, V is the Volume (where the gas is enclosed in a cylinder), ( v with a dot over it would be volume flow rate i.e. cubic metres per seconds, where the Gas is flowing through a system, T is the absolute Temperature, and n is the Adiabatic Index.
These equations purely reflect the relationship between Temperature, pressure and volume.
My understanding was that the nozzle ring (fixed blading) guides the Gas / steam onto the rotating blades at the correct angle, according to whether they are impulse or reaction blades and at the same time, the nozzle ring acts as a series of divergent nozzles, expanding the gas and causing the pressure to drop as the velocity increases.
There are fundamentally 2 types of turbine, impulse and reaction.
Impulse is the defined as the change in momentum. Momentum is calculated as Mass ( or mass flow rate) multiplied by velocity.
so here we have (M1 V1 )- (M2. V2) for steam or exhaust gas hitting a turbine blade will be the momentum lost by the Gas.
One of the Fundamentally Laws of Physics is the conservation of Momentum, so this momentum is GAINED by the Turbine Blades.
Momentum is a Vector, it always has a direction as well as a quantity so you can use Vector Triangles to calculate the direction of the Momentum applied to the turbine blades from the original and final direction of the Gas.
In a reaction turbine, the gas flowing over the blades acts in the same way as air flowing over an aircraft's wing and generates "Lift" in accordance with Bernoulli's Theorem. I can't remember the equations for that off the top of my head! But I don't think Kinetic energy comes into that either.
It is always better to ask a stupid question than to do a stupid thing.