1、null 59 null 1 null null null null null null null null null null null null null null null null null null V olnull 59 null N onull 1null 2008 M 1 null null Jour nal null of null Chemicalnull Industr ynull andnull Engineer ingnull ( China) null null null Januarynull 2008 I M ? p李伟锋, 孙志刚, 刘海峰, 王辅臣, 于遵宏
2、( v L i , Z 200237)K 1 : L E L N I L , I I W a 1 / M ? p b T ? C , 2D null L null 4D ( L I W , D I ) H , I M , , L ? 3 ; I l s H , | ? 3 v M , N H M M 1 b 2D null L null 8D H , 1 M ; L 8D H , I 1 M v M b1 o M : ; M ; ; L E ; L N m s | : T Q 021null 1; O 358 null null null null D S M : A c I | : 0438
3、- 1157 ( 2008) 01- 0046- 07Stagnation point offset of two opposed jetsLI Weifeng, SUN Zhigang, LIU Haifeng, WANG Fuchen, YU Zunhong( Key Laboratory of Coal Gasif ication, Ministry of Education, School of Resources andEnvironmental Engineering, East China University of Science and Technology , Shangh
4、ai 200237, China)Abstract: T he flow field of tw o o pposed jets w as ex perimentally investigated w ith the smokenullw iretechnique and hotnullw ire anem ometer fo r the stability o f im pingement plane and stagnation point offset atvarious nozzle separ ations and exit velocity ratiosnull The resul
5、ts show ed that at 2D null L null 4D ( w here L isno zzle separatio n and D is nozzle diameter ) , the im pingement plane w as instable and o scillated at equalex it velocities, w hile the im pingement plane deviated from the midnullpoint to a large ex tent and the flowfield becam e stable compar at
6、ively at a sm all difference of ex it velocitiesnull At 2D null L null 8D, the stag nationpositio n w as v ery sensitive to the change of velocity r atio; w hile at L 8D, the po sitio n ofstagnation point becam e insensitive to the chang e of exit v elo city ratio.Key words: imping ing jets; stagnat
7、ion point offset; stability; smokenullwire technique; hotnullwire anemometernull null 2007- 03- 26 l , 2007- 05- 30 l b “ # B T : ( 1976 ) , 3 , p V 3 , = b “ : W 9 “ ( NCETnull05null0413) ; S E $ ? Z 9 “ ( 2004CB217703)bnull null ? r 20D) + # M ? p , T ? C , I W / ( 2D null L null10D) , M ? p 1 v I
8、 W / , # 17null18b v 7 ? I V , L E A U L N M m , “ d I W / M? p b1 null L Z E I U i m m 1 U , 1 G b 9 9 I nozzle 1 no zzle 2, ? 3 b ) CK l , , Y V L _ s V b L nozzle 1 g ( u1 9 v nozzle 2 g ( u2,5 V l 1 a= u2/ u1, M nullx= L/ 2- x2 nullx= x1- L/ 2bL L E A U L N M E b L E A U V 4 A U m , 9 B K , g l
9、, I W ? v , 5 i , A U m b L 5 m 1 null I U i mFignull 1 null Schematic plan o f two oppo sed jetsnullK , V Z L / L s , V s b A U L E , I _ 0null 1 mm E , ( p F b Y V E H , y ? 7 ? , , , V 7 A U b L Sony DSCnullS75 M L H v , ; H W 1/ 1000 s, 20 f v b DANT EC Strenullamline 4 L N , “ d “ q ! 20 kH z,
10、“ H W ! 5 s, L B h b H L h % U S O , V , V r 0null 1 m mbL I D 30 mm, I W L s Y Da2Da4Da6Da8D 10Db I g Rey no lds l Re = Du0null ( 1)T null u0 I g , nulla s Y b * b u0 1null 65 2null 36 m !s- 1 W , Re 3284 4692 W , () u b2 null T ) 2null 1null I M H I W / + I 2null 36 m ! s- 1 H , I W / L A U v n m
11、2 ( a ) ( e)bV m V A , L Da6D # 8DH , B L E v I L , m B f v ; L 2D 4D H , H Y v A U B “ , L !47!null 1 null null : I M ? pm 2 null M H I W / H v Fignull 2 null Inst antaneous photo g raphs at v ario us nozzle separ ations with same ex it v elocit ies 4 C B , I L b m 2 U , L = 2D H , v u W - 0null 5D
12、, 0null 5D = ; L = 4D H , v u W - 1null 4D, 1null 4D = b L ? C ? u T= , M 1 ; u W ? T= , V B M 6 B , u W b H1 X Y V I g P I d 4 , Kostiuk 9 L ? C M bY V 4 , s l H , v B I g l M , ? 3 v M , P ? 3 b v 8 , L 2D 4DS = , I M H , H s l $ bv , K P 19b T V d Og aw a 13null14 4 T , L ? C I M H H V 4 b v s ,
13、L u W M b 1 , L ? C T Denshchikov 10null11 L T U T b L T V M H , !48! null null null null null null null null null null null 59 null“ ) M / p 7 , i O Z_ b7 ? C T , , M M H1 , V m 3 ( b)a( c) V A b2null3null L T I H , M 1 , y N V L N I W # 1 / L s , s T n m 4bV m V A , L L E A U b I W / , L “ 1 M ? p
14、 i M : L D 10D H , “ 1 h l , v l I Z _M ; L = 4D H , “ 1 h l , B 7 S _ l I Z _ ? 3 v M , d L l I bV m 4 V 4 M 6 B + , L = 4D H , I 1 V 0null 97 M 0null 8, P 1 M v , M M 9 A b9 L E ? C I M H , Q 7 M b I W / M 1 M nm 5 m 6, m M s Y I D I W L 1 , s Y Y M M bV m 5 V A , L Da8D 10D H , M nullx/ D “ a h l
15、 L 9 v t ; L 2Da4D 6D H , M nullx/ D “ ah l 7 S y 9 F , 7 t bV m 6 V A , M 1 / , L 4D 6D M nullx/ L K v , L 2D 8D Q , L D 10DK l b I , I W 2D 8DS = , + Y I W 4D 6D H , M 1 M , iO l Y V v M b7 L Da10D H , 1 l bT ; v I W / ( L 20D ) l I W / ( L 20D H , 1 W L 1 “ , 7 , ? C 2D 6DS = , 1 W A d L 1 “ b 4
16、d Og awa 13null14 T Kind 15 L T s , - L H q L = 4null 3D, I W S , L H q L = 240D, v I W S by N , 8 T - T V , H , I W S = M ? p + , s l W ( L 20D) b1 V d I W / M ? p s “ - 1 4 b s Lv 4 ? C , _ “ H , v 9 b g M v , s 7 , K P 20 b I M H , 9 M , _ ?3 H , , 7 v , y 7 ? 3 v M b 6 B Z , I W , v Y 9 B “ , 1
17、L= D H , ? 3 # S = , H _ Z _ v , M ; L 10D H , “ v ? Z u , v v l , v Y v h h b3 null null M ? p 1 1 , 1 “ p a b L N L E A U I W S = u M ? p , / 1 b( 1) M H , I W 2D 4D S = , I L B u W = , H ; H , | ? 3 v M , H M M 1 b( 2) I W 2D 8DS = H , 1 M , 1 l M V v M ; S , “ I W h l 9 v , 1 Y v M A bi O , I W
18、S = , 1 M Y d L b N : M ? p I W M 1 “ , T I W 2D 8DS = , A I n M ? p b null | null null null null null null a 1D I , mL I W , mRe Reyno lds u, u0 , u1, u2 _ , m ! s- 1x _ a _ U S , mnullx M , mb * , Pa! snull b , kg! m- 3References 1 null Tamir A, Kitton Anull Application of impin ging streams inch
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20、97 ( 1 ) :27null38!51!null 1 null null : I M ? p 3 null H oss einalipour S M , M ujumdar A Snull Flow and th ermalcharacteristics of steady two dim ensional confin ed laminaroppos ing jets ( % ) : U nequal jetsnull InternationalCommunications in H eat and Mass T ransf er , 1997 ( 1 ) :39null50 4 nul
21、l J ohnson D Anull Experimental an d num erical ex amin ation ofconfin ed lam inar opposed jets ( ) : M omentum balan cing.International Communications in H eat and Mass T ransf er ,2000, 27: 443null454 5 null J ohnson D Anull Experimental an d num erical ex amin ation ofconfin ed laminar opp os ed
22、jets ( %) : M omentum im balance.International Communications in H eat and Mass T ransf er ,2000, 27: 455null463 6 null J ohnson D A, Philip E W oodnull S elfnullsustained os cillations inoppos ed impinging jets in an en closurenull T he CanadianJournal of Chemical Engineering , 2000, 78: 867null875
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