Aim of this paper is to the analyze of the eects of a ﬂying object, advected by the motor internal ﬂow, on the internal ballistics of an aft-ﬁnocyl SRM, with typical characteristics of a stage or a small booster. The objective is to provide a preliminary study able to give an assessment of the eects on SRM internal ballistics of the outﬂow from the nozzle of pieces of the SRM components (i.e. expendable igniter) or, more realistically, pieces of thermal protections of relevant dimensions (with respect to the nozzle throat area of the SRM) detached from SRM components (ﬂoaters, igniter, casing thermal protections). The numerical simulation of the moving object will be performed with a Q1D unsteady model of the SRM internal ballistics, as presented in the following section. The idea is, in fact, to obtain from the simulations a feeling about the physics of the problem, without having to face too high computational costs and complexities for the simulation. In fact, the use of more simpliﬁed approaches like 0D models, both steady and quasisteady, may imply the risk that too rough simpliﬁcations of the problem analyzed may brings to useless qualitative and quantitative comparisons with the experimental data. On the other hand, the computational costs and complexity of the problem faced with axisymmetric or 3D approaches is prohibitive and not useful for a preliminary study. For these reasons, the analysis will not cover the simulation of an object carried by the ﬂow in the nozzle, with the scope to prove or not the possibility that the ﬂying object can impact the nozzle itself (which in the typical ﬂowﬁeld conditions of the nozzle seems to be possible only for an object with a irregular - e.g. not a sphere). A grid convergence analysis for the computed solutions and a parametric analysis will be performed in order to achieve the objectives of the work.
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|Titolo:||Analysis of pressure blips in Aft-Finocyl solid rocket motor|
|Data di pubblicazione:||2013|
|Appartiene alla tipologia:||04b Atto di convegno in volume|