1、null 24 null 4 L 8 Vol. 24,No. 4nullnull 2010 M 08 Journal of Experiments in FluidMechanics Aug. ,2010null c I | : 1672null9897(2010) 04null0061null05y H q / T k 李明水,王 null 骑( 2 Y v k , null 610031)null null K 1 : 1 ? T y H q / k ,i 1 k T _ Hq / b k T V : T ) 1 H , T i A r , P / T A b k T V : T ) 1
2、H , T / T A , v b T - Z i , O _ 195null H , T K v bnull null 1 o M : T ;y ; k ; null null m s | :TP601null null null D S M : AThe wind tunnel test investigation on wind loading of twin chimneysconsidering the interference of chimneys and surrounding buildingsLI Mingshui, WANG Qi(The Research Centref
3、or Wind Engineering, Southwest Jiaotong University ,Chengdunull 610031, China)null null Abstract:The wind loading of twin cylinder chimneys was investigated by the wind tunneltesting. The static force and dynamic forces at basement of the chimneys under different yaw annullgles of wind were measured
4、 particularly considering the interference of chimneys and surroundingbuildings. Results of stiff model testing show that the shelter effects of the front chimney cancause a remarkable reduction of the base static forces of the back chimney when they are in tannulldem arrangement. Results of aeroela
5、stic model testing demonstrate that when the two chimneysare arranged in tandem, dynamic forces of the back one are significant due to aerodynamic internullference of the front one. When the surrounding buildings arein front of the chimneys and theyawangle of wind is 195null, the synthetic base mome
6、nt at chimney takes the maximum quantity.null null Key words:twin chimneys;interference of surrounding buildings;wind tunnel testing;baseforcel : 2009null11null05; : 2010null06null200null null null null ? T V 220m 5 =c T b r c 216m, 216 160m B ( c , 11.6m; 160 60m B 2.5% , / 16.6m;60m /b 4% T , 21.4
7、mbnull null N ? g u , y ( 1 ,y N Y V B B b u10m ) 50 M B K v 44m/sb T V 55m ? Q V # B V 40m , P _ H , T | s y 7 ? 3 M , T s + ? 3 M ; 6 B Z , T ( 15m, 118.2m, 8 ( b 1 T 1null2 , T ) 1 , l 10 H ,) T | / T 3 v by N , y ,F + , T = ( ) ? C ? S ,7 A s I n T M , # y H q / ,Y V k ? bnull null k E T + ( + +
8、 ), T M , # H y $ ,s Y s ? M k T = b k T W% ) T 1 H M , # y ) _ H T r b 6 T s Y ( k , T E “ r b k T H 9 M H q / T ! 9 4 z I b1null k null null k j , + 1 1 180b 1 / , V T 1 y ( V E , E q | V4.5%(B E q v 5%)b T 1. 222mb B 2. 35m b y ,s Y ! T bnull null T F b M H q / , P 8 ? 3 V 9 l bnull null “ H q +
9、+ L = M , 1 E L a # ED + ,i M : a aE D b T . d ! 9 T / , T B = 4 , 5 4 , 1 = 4 b “ E / V L M + , L C M b E 4 F , , W | 1. 5mm W # b # 9 d ( ), h W # W Y bM T L ,Y V S V bm 1 2 s Y bm 1null T Fig. 1null The chimney models installed in wind tunnelnull null k XNJDnull1 = k b T 1 k b = k j 2. 4m( z )a2m
10、( )b k ! U a Y F v H E , V E S ? S 1 p Y v + b , B Y v H + E b k - L N n , ) ( bm 3 4 M T bm 2null Fig. 2null The detail of surrounding building modelsm 3null ( mFig. 3null The mean wind speed profilem 4null ) u Fig. 4null The turbulent intensity profile2null k Z Enull null k ( E B v u ,i T M T 1 I
11、n r b k ,B M T ? , s b B k , 90s “ , “ q 256Hz, k I 1/3 (0. 41m) ( 14. 5m/sb k _ S 0null 360null, 15null B W ; V T M 1 A ( k ) 90null 270null62 L null null null 8 null null null null null null null null null null null null null null null null null (2010) 24 null_ H ), 3null B W M k bm5 _ l ,m 6s Y 8
12、 “ “ / s Z _ bm 5null _ lFig.5null Definition of wind yaw anglem 6null lFig. 6null Definitionof windloads3null k T # ) 3.1null k null null I n T ) a100 M C K v # V T V ? i y , ! 9 | 0. 75kPab k X M q L = ! 9 / bm 7 B T (0null _ H ) Z ,m 5 T A) ( “ , X L = ,/ b) _ M w L bV m V A , 80null 100null _ S
13、= ,/ T E E ( A h l b E (Fd ) ,/ _ T 90null H 2500kN,7 N H ) _ T E 5 4170kN, / 40%P ;7 T ) - Z H ( 0null_ ), E 9 4082kN,/ 1 9 | 40%b _ / T _ = ( Fs) ( A l _ = (Fd ), O _ 90null ? 3 A K b N V w , T ) 1 H ( 20null S ) , _ T / _ T A T ,V 7 / T E A ,7 3 F v _ bN , _ 180null H , , T E H 9 bm 7null = _ M w
14、 LFig. 7null Mean forces varying with wind yaw anglesnull null T 8 E “ l / U :CD = Fd/ ( 12nullnullU2 B !H ) ( 1)null null , CD 8 E “ ; Fd _ s , “ E ; nullU ( ; B !H s Y + + ,s Y | 8. 3cm 122cmbnull b , null=1225kg/m3b _ / E “ w L m8 U b 80null 100nullS = , T T , E “ ( 0. 42, _ E “ ( 0.61b3.2null k
15、null null “ ! 9 / ( ,i T 1 , m 7 U ,V V A bm 9 B T (m 5 I | A T ) _ M w L bnull null V m V A , _ _ M ,V T Z _ s M b 80null 100null _ S = ,) / 63null 4 null null null null null null null null null null null null : y H q / T k T E ( _ / A 4 6 bE 0null H 21252kNm 6 99null H K v 42550kNm,9v B ; 9 0null
16、H 19829kNm 6 99null H K v 31707kNm,9 v 60%b7 N H ) _ T E s Y 5 26710kNm 23707kNm, s Y 9 v 20%26%, 6 / T A ; N V w , T 8 ( , T ) 1 H ( 20null S ), T W i A M T ,V 7 v 9 v , O / _ T 9 1 v _ b 6 , T ) - Z y H q / H ( 150null 210null), E 0null f M , 1 A v 0null b N V A , T - Z i y H , / | F v T _ bm 8nul
17、l T 8 E “ Fig. 8null The drag coefficient of the chimneym 9null T ( Z (E D 1 5%)Fig. 9null The dynamic basemoments3.3null T k 3null4null null k , 4 L C v E b , v r k E E , 1 k 0 ) b k M v L o 9 ,y N A1 ( T k T L k T b ESDU800257 ,4 8 k L = v Z T ,B 9 F 8 V Y ,= 9 F b k H ,Y V 8 V T L ,9 F V Y 8null9
18、 , # 8 V 8 8 m ,sY 8 H q / (u 12%) “ s # E “ ( m 10 m 11 U , m 10 E n I D 10) ; ) / ( u T E “ , V 5m/ s 29m/s S M , 8 T n m 11 U bV m 10 V A ,) u ; 8 “ D 10 E wL , T L 8 “ s 5 E w L bV m 11 V A ,; T ( E “ 0.755, (u 12%) E “ 0. 626,7 T L T u E “ 5 0. 573b 6 , ; 8 E “ 0.626 T L 8 E “ 0.573 M 92%,V - !
19、9 O bm 10null T 8 V Y / “ Fig. 10null The pressure coefficient (different roughness)m 11null T V Y / E “ Fig. 11null The drag coefficient (different roughness)3.4null 1 k T ) 3.4.1 null T 1 H r 2, 5null6null null 1 k T , 1 L/ D M 1 o b “ / , L/ D= 4 H ? 3 ; 7 “ / , L/ D= 2. 5 H ? 3 b? 3 W “ W b N W
20、S = ,/ E “ , O M v , N W ,E “ v64 L null null null 8 null null null null null null null null null null null null null null null null null (2010) 24 null 0. 4 b k T L/ D= 7. 8, X “ W , Y = ,y N 1 H / T ( E “ 0.42 bnull null k T _ M f ,V m 9 V A , ) 1 H , ( v / (m 0null _ ) ,7 ) / (m 90null _ )9 A v (
21、m 270null _ )b7 D 5, “ / , O 4 , , 1 , . “ / 1 J . ,1989, 21(4): 385null390. 5 null Arie M, Kiya M ,M oriya M, et al. Pressure fluctuationson the surface of two circular cylinders in tandem arnullrangement J . Trans. ASME: Journal of Fluids Enginullneering 105; 161null167. 6 null $ , ? , , . v H 1 L
22、 J . b , 1992, 10(2): 176null184. 7 null Engineering Science Data Unit ( ESDU) , No 80025: M eanforces, pressure and flow filed velocities for circular cynulllindrical structures: single cylinder with two dimensionflow, 1981. 8 null . Y V s k J. ,2002, 29(2) :129null132. 9 null ? ,u , . V Y H + k J. y , 2006, 36( supplenullment) :301null304. 10 DLT 5339null2006. ? ! 9 / ? S S. : ,2006.T e :null ( 1966null), 3 , 2 , q b 1 Z _ : B ,y F bY : + 8 g = B 2 Yv k ( 610031)bEnullmail: lms_rcwe 65null 4 null null null null null null null null null null null null : y H q
