The Const Acceleration module is very similar to the Acceleration module, in that it applies an initial acceleration to the particle. The key difference, however, is that the Const Acceleration module does not accept a Distribution property.
Const Acceleration is the only type of acceleration available to GPU Sprite particles.
A vector distribution indicating the acceleration to use. The value is grabbed based on the EmitterTime at the spawn of the particle.
This module will add a vector parameter to the particle payload data, UsedAcceleration. This value is used to retain the acceleration over the life of each particle.
Each frame, the current and base velocity values of the particle is then updated using the formula (velocity += acceleration * DeltaTime) where DeltaTime is the amount of time passed since the last frame.