Dynamic Characteristics of a Fluidic Valve for Divert and Attitude Control System

Theoretical Modeling, Design and Simulation of an Innovative Diverting Valve Based on Coanda Effect

“…It is very difficult to develop a mathematical model for the above time interval due to the complex flow physics associated to flow unsteadiness and turbulence. According to the available literature, with particular reference to the experimental characterization conducted by Tesaret al [13], the STP time interval is related to: In case of configurations and devices similar to the present case and working with gases, the time interval is of the order of 10 −3 s [14]. In case of water a value of the order of 10 −2 s is expected because, even if the velocity of propagation of perturbations is higher due to the incompressibility of water, its density is thousand times higher than a gas like air, so the higher inertia of the fluid stream has a greater influence on the switching time interval.…”

“…In Figure 5, a sketch of the configuration under study is reported and the mathematical model is based on this reference flow structure The above system (17) can be solved numerically, taking into account that the angle θ * will be realistically in the range 0-45 • . After a revision of the available literature for similar configurations [11][12][13][14], a first geometry guess for the ABD is obtained assuming the parameters in Table 1. The flow attachment point coordinate is:…”