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This paper focuses on a design and simulation and experimental results regarding a prototype of an electronically controlled hydrogen pressure regulator. The geometric CAD (Computer Aided Design) model of the regulator has been developed using the Catia v5 software. This model has been developed based on the mass demand for a hydrogen fuel in the Wankel engine under research. Done with the use of the Ansys Fluent software, the simulation research employs a CFD method. The simulations can determine the impact of regulator geometrical parameters like a nozzle geometry, a size of nozzle chambers and a high and reduced pressure on its basic flow parameters, i.e. velocity and pressure distribution. The experimental tests on this prototype pressure regulator are done under operating conditions in an automotive vehicle. Basically, the study verifies a system response to a control error, i.e. verifies regulator operation with respect to its output pressure stability. The paper shows the non-uniform distribution of medium pressure and velocity in a hydrogen pressure regulator with different nozzle types. The real model of a pressure regulator with a single-hole nozzle has resulted from the simulation tests. The optimal sizing of chambers, a nozzle shape, and an electronic control system for hydrogen pressure confirm that the prototype hydrogen pressure regulator stabilises the pressure on target.
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