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A customised version of FIRE™ code is chosen to simulate the spray injected into a controlled environment by means of a Common Rail system driven via a Programmable Electronic Control Unit. Numerical results are compared to experimental data collected under various operating conditions, namely varying the injection pressure up to 120 MPa, and the gas back-pressure between 0.1 and 5.0 MPa. Non-evaporating conditions are considered. The employed optically accessible test chamber allows to light the spray with a flash lamp or a pulsed laser sheet, generated on the second harmonic of a Nd-YAG laser (532 nm, 12 ns in duration). Images are collected at different instants of time after the start of injection by means of a CCD camera. A digital image processing software is used to evaluate the major characteristics of the spray, as the penetration length and the cone angle. The injection flow rate is properly measured on a rate-of-injection flow bench for different injection strategies.