A physical method for predicting thrust imbalance of solid rocket motor pairs for a satellites launcher
A physical method for predicting thrust imbalance of solid rocket motor pairs for a satellites launcher
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预测卫星发射固体火箭发动机副推力不平衡的物理方法
DOI:
10.2514/6.1987-1740
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发表时间:
1987
期刊:
影响因子:
--
通讯作者:
Bernard Loubere
中科院分区:
文献类型:
--
作者:
G. Delannoy;Bernard Loubere
T h i s paper p r e s e n t s a method f o r c a l u l a t i n g w i l l he very large (more than one hundred and p r e s s u r e and t h r u s t ve r sus t ime i n a s o l i d f i f t y m e t r i c tons per b o o s t e r ) . The c u r r e n t p r o p e l l a n t r o c k e t motor. This nethod t a k e s i n t o p r o p e l l a n t mixing c a p a b i l i t y is p r e s e n t l y not account p o s s i b l e s c a t t e r i n g of p r o p e l l a n t l a r g e r than 3 m e t r i c tons per mixer . b u r n i n g r a t e which f o r i n s t a n c e may have a I t is p r a c t i c a l l y imposs ib le t o o b t a i n two S i g n i f i c a n t e f f e c t on t h e t h r u s t imbalance f o r a s t r i c t l y i d e n t i c a l p r o p e l l a n t b a t c h e s . r o c k e t b o o s t e r s p a i r . One of thc p r e l i m i n a r y T h e r e f o r e , t h e q u e s t i o n a r i s e s of which d c s i g n s of b o o s t e r s pair f o r t h e f u t u r e procedure has t o be used f o r manufactur ing t h e s a t e l l i t e s l a u n c h e r Ariane V c o n s i s t s in p r o p e l l a n t g r a i n s f o r t h e s e two b o o s t e r s . segmented s o l i d r o c k e t motors . The method and Procedures t o be exami.ned a re ! subsequent s t a t i s t i c a l a n a l y s i s are used f o r a n a l y s i n g and s e l e c t i n g the bes t procedure f o r making one segment, and a f t e r w a r d s an o t h c r c a s t i n g p r o p e l l a n t h a t c h e s d u r i n g t h e manuone by s t a c k i n g t h e b a t c h e s as they are f a c t u r e of t h e g r a i n s . produced. making one segment wi th a few number of l a r g e manufac tur ing s imul taneous ly t h e two boosters Nomcnclature b a t c h e s or a l a r g e number of small ha tches . a c o e f f i c i e n t of t h e burn ing r a t e l a w by symmetr ica l ly d i s p o s i n g every h a l f hatch i n A t nozzle t h r o a t area each segment. A,B hounding p o i n t s of combustion l i n e CD d i s c h a r g e c o e f f i c i e n t To f i n d t h e b e s t procedure f o r reducing CF t l lr l lst c o e f f i c i e n t t h r u s t d i f f e r e n c e between t h e two b o o s t e r s , F t h r u s t of t h e r o c k e t motor c u r r e n t methods of c a l c u l a t i n g burn ing f r o n t 2 combustion line : i n t e r s e c t i o n of t h e area and t h e r e f o r e t h r u s t , as a f u n c t i o n of weh burn ing f r o n t w i t h a p lane i n c l u d i n g t h e burned are u s e l e s s . It is necessary t o proceed motor a x i s t o a f i n e r p a t t e r n t h a t is a b l e t o t a k e i n t o M c u r r e n t p o i n t of combustion line 2 m mass flow r a t e i n s i d e a batch or between d i f f e r e n t ha tches . N normal v e c t o r o n 2 n p r e s s u r e exponent of t h e hurn ing r a t e l a w 0 r e f e r e n c e p o i n t 2. Method f o r knowing t h e burn ing f r o n t s c u r v i l i n e a r a b s c i s s a on l i n e 2 T t a n g e n t i a l v e c t o r on 21. P h y s i c a l problem t o he addressed t t ime t y reduced t ime The p r o p e l l a n t g r a i n which is cons idered has an Vc burn ing r a t e axisymmetr ic geometry. It is assumed t h a t t h e Vy reduced burn ing r a t e x a x i a l c o o r d i n a t e u n r e s t r i c t e d p r o p e l l a n t s u r f a c e . It is a l s o y t r a n s v e r s e c o o r d i n a t e assumed t h a t p r o p e l l a n t burn ing r a t e is an 9 t h r u s t e f f i c i e n c y axisymmetr ic f u n c t i o n of space and time. The 8 c h a r a c t e r i s t i c a n g l e f o r a prominent p o i n t manufac tur ing process g e n e r a l l y j u s t i f l e s t h i s ,Qp p r o p e l l a n t d e n s i t y assumption. 9 a n g u l a r s e c t o r under combustion The problem is t o d e s c r i b e and c a l c u l a t e which e v o l u t i o n occurs f o r t h e burn ing f r o n t and t h e t h e t h r u s t versus t ime. 22. Mathematical p a t t e r n of p h y s i c a l phenomena Because t h e geometry is axisymmetr ic , t h e b u r n i n f r o n t can be d e f i n e d as a cont inuouS line.$ i n a p lane i n c l u d i n g t h e motor ani.s, between two p o i n t s A (xo, y. ) and B (x, , y, ) account p r o p e l l a n t burn lng r a t e s c a t t e r i n g -, pc pressure i n t h e combustion chamber e v o l u t i o n g r a i n is i g n i t e d a t once on t h e whole S u b s c r i p t s o,i,m f o r numbering p o i n t s of the d i s c r e t i s i z e d gas f low r a t e and also what is the e v o l u t i o n of +,f o r l e f t and r i g h t d e r i v a t i v e s S u p e r s c r i p t s K f o r numbering t ime S t e p s 1. I n t r o d u c t i o n line 2 The f u t u r e s a t e l l i t e s l a u n c h e r Ariane V w i l l he p r o p e l l e d by a main l i q u i d p r o p e l l a n t rocke t (c f f i g u r e 1 ) . motor a i d e d by a p a i r of segmented s o l i d p r o p e l l a n t r o c k e t b o o s t e r s . Cons ider ing t h r u s t and burn ing t ime t h a t are r e q u i r e d , t h e s ize of t h e s o l i d p r o p e l l a n t grains for t h e two b o o s t e r s Copyright 0 ~mer icsn lnrlitute of Aer(lnPUticE and A i l r ~ n a ~ t i c s , h e . . 1987. All righlr resewed. F i g u r e 1 Regress ion of a c u r r e n t po in t M on t h e combustion l i n e O n l i n e 2 , i t is p o s s i b l e t o c h a r a c t e r i z c a c u r r e n t p o i n t M by t h e l e n g t h of p a t h s irom p o i n t A t o p o i n t M S(H) = J d s (1)