Modeling of jet braking of a rail stand for aerodynamic testing of large-scale models of supersonic passenger aircraft

Аuthors

Goryainov V. A.

Russian University of Transport (RUT (MIIT)), 127994, GSP-4, Moscow, Obraztsova St., 9, building 9

e-mail: gorva797@mail.ru

Abstract

This report presents an analysis of the interaction with the railway track of a supersonic jet flowing from a super-elliptical nozzle of a main engine mounted on a movable rocket carriage with an 2nd generation supersonic passenger aircraft (SPA-2) model. The structure of a supersonic jet with a rectangular cross-section during its interaction with the incoming flow is determined. A non-critical impact of the brake engine jet on the upper structure of the track and the absence of an impact on the rocket carriage with the tested SPA-2 layout was established. The possibility of strictly adjusting the length of the braking distance depending on the magnitude of the braking engine thrust is substantiated. The results of modeling the jet thrust of a rocket carriage moving on the take-off and landing modes of an aircraft have shown the ability to simulate real overloads within the safety margin of the designed aircraft and, accordingly, full-scale deformations in aeroelastic tests on the SPA-2 models. 
A mathematical model of a “multi-fluid” medium was used for numerical research. This model is adapted for calculating flows in the nozzles of a braking engine. The results of the literature analysis and modeling of jet braking of a rail stand for aerodynamic testing of SPS-2 models have shown both the relevance of developing methods for braking rocket carriages with an adjustable amount of dynamic overload, and the feasibility of adequate mathematical modeling of the aerodynamics of a rocket carriage with large-scale SPS-2 models.
The results obtained can be used to solve special problems of using systems based on the principles of rocket engines and for other national economic purposes, in particular, to develop a jet method for emergency braking of high-speed trains, which can significantly reduce the braking distance in critical situations compared to all existing means of braking high-speed trains.

Keywords:

simulation of aerodynamic tests, supersonic passenger aircraft (ATP), rocket carriage, rail stand, super-elliptical nozzle, jet braking

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