What is the point of having blades on a compressor. I heard on NASA that it alters the flow but how would this help. As the flow of a fluid increases, the pressure decreases, and vice versa. The rotors increase the speed of the air and descreases the pressure and the stators decrease the speed of the air and increase the pressure. How would this help create higher pressure. Why not just have the rotors? I know that the ducts this whole thing goes in gets smaller as it goes on, does this play a role? Don't get all complicated here on me, I'm still learning about airplanes and flying. Try to be as simple as possible, thank you.
The statement about the rotor blades ("the rotors increase the speed of the air and descrease the pressure") is not correct, because Bernoulli's Equation does not apply in this situation. Hence, the statement "as the flow of a fluid increases, the pressure decreases, and vice versa" isn't appropriate for the rotating compresser blades.
Bernouilli's equation (below) assumes no energy is being added or removed from the fluid. This is true when the fluid is flowing through the stationary stator vanes, but not the rotating blades.
The rotating blades increase the velocity, but do not decrease the static pressure, becuase they are adding mechanical work (energy) to the fluid. This energy (or power) comes from the turbine.
When no energy is being added to the fluid:
$$ total\space pressure = static\space pressure + 1/2 \rho v^2 $$
where $\rho$ is the density and $v$ is the velocity.
This is the mathematical equivalent of your statement "as the flow of the fluid increase, the static pressure decreases".
But, the rotating blades add total energy. So this equation does not apply, so as the velocity increases, static pressure does not go down. But, total energy has increased, by the mechanical work done by the blades. So the value on the left of the equation goes up as the fluid flows through the rotating blades. Next, the fluid flows through the stationary stator vanes. Because they are static, they add no energy, so Bernoulli's equation now does apply. Hence, as the velocity is decreased, the static pressure goes up (i.e. there is no change in total pressure).
If you just have the rotor blades, and no stator vanes, the compressor would just make the fluid move (i.e an increase in the total pressure) but with no increase in static pressure. The stator vanes slow the fluid down, and convert the velocity into an increase in static pressure.
You need to understand the difference between total and static pressures.
You're talking about an engine. Bernouilli is valid for free flow when no energy is added to the airflow, and adding energy to the airflow is exactly what a jet engine does. Inside an engine, it is perfectly possible to increase both pressure and speed. It is not done that way because higher pressure is what is required, but it is possible.
This energy added to the airflow is applied by the rotors, in the same way that a propeller does. In doing so, they also make the airflow swirl around a bit, and the stators twist the flow back. That is all they do, make life easier for the next rotor stage to do their work. Stators don't impart any energy on the flow.
In simple terms, the compressor blades (both the fixed stator blades and the rotating "fan" blades) in the front of the engine are an air pump: the rotating blades actively draw air into the engine and squeeze it, raising its pressure. the work required to compress the air is large, and comes from the power-extraction turbine at the back end of the engine. Many rotor/stator pairs are present in the compressor side of the engine; each one squeezes the air further and further, raising its pressure further and further. At the end of the process, the air exits the compressor and is sent on to the combustors.