Effect of solid fueled ramjet forcing on flight vehicle performances

Аuthors

Yanovskiy L. S.^1*, Raznoschikov V. V.^2**, Sharov M. S.^1***, Kolomentsev P. A.^1****, Popova A. B.¹

1. Central Institute of Aviation Motors, CIAM, 2, Aviamotornaya St., Moscow, 111116, Russia
2. Central Institute of Aviation Motors named after P.I. Baranov, CIAM, 2, Aviamotornaya str., Moscow, 111116, Russia

*e-mail: yanovsky@ciam.ru
**e-mail: raznoschikov@ciam.ru
***e-mail: mishgun-907@yandex.ru
****e-mail: p.a.kolomentsev@yandex.ru

Abstract

To the supersonic flight vehicle of an atmospheric zone of operation, with impellent installation using as a mid-flight stage the solid fuel ramjet (SFRJ), after the termination of work of a starting stage can be demanded additional acceleration till the speed necessary for steady work of ramjet. Realization of it is possible by means of engine forcing at placing of an additional solid fuel grain in the channel on the case of a starting stage. Characteristics of engine and, accordingly, flight vehicle characteristics change at a variation of forcing degree which is defined by geometrical parameters of an additional solid fuel grain. In this study calculation of characteristics of engine has been performed by an iterative method on the one-dimensional model, based on the conservation equations. As the initial data for modeling the international standard atmosphere, throttle performance of air inlet, characteristics of solid fuel and geometrical parameters of the engine were used. In addition given model has been corrected by results of experiments on connected pipe facility which have been performed at various forcing degrees of solid fuel ramjet. The rate of gasification for main solid fuel grain and combustion efficiency in the mixing chamber have been corrected. Correction was performed by inclusion of corresponding coefficients to model. As a result of calculation dependences of the flow rate of air through the engine, gasification products flow rate dependences, thrust coefficient dependences and dependences of the ratio of thrust coefficient to drag coefficient have been obtained as a functions of flight Mach number for different operating conditions.
Calculation of flight vehicle characteristics has been performed using flight vehicle mass center movement mathematical model which includes two dynamic equations, two kinematical equations and the equation of weight change. Effects of different forcing degrees of a solid fueled ramjet on speed and flight range of supersonic flight vehicle have been assessed by results of this calculation.

Keywords:

ramjet, solid fuel, pull-economic characteristics, flight vehicle performance, thrust forcing

References

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