An Experimental Evaluation of 1-D Valve Models under Dynamic Conditions

The influence of unsteady flow in engine pipes system is a first order parameter to take into account when designing an engine. Wave motions being relatively well described by a 1-D model, these types of algorithm are very common. Logically, the boundary conditions have to use the same formulation. The importance of valve models is thus demonstrated.

The aim of this paper consists of a comparison between two valve models. In order to obtain the discharge coefficient, algorithms have been coded and tested in a stationary test bench. Different computation methods of coefficient have been used. Then, a dynamic test has been performed to determine which valve model coupled with a test analysis method gives the best result.

This work shows that each tested models give good results. As a consequence this kind of experimental setup can be used in order to study the fluid behavior under dynamic excitation and to study the temperature effect on the models.