滚动轮胎表面对流换热系数的研究

滚动轮胎 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 面对流换热系数的研究 35??K??k11?E 2007??K?11?)K? ??K??mK???K???K??;K???K???K???(???M?????G) J.HuazhongUniv.ofSci.&Tech.(NatureScienceEdition) Vol.35No.11 K?Nov.K?2007 ?M?q???E:2006207212. ???0????:??K???(19732),??,??????;???N,?????????;???P?Y???H????(266061). 2y@63 ???????????N?3?c???m?????????????i?????????=??????(BS6);???N?3?????????????g?=?????? ();?????5?????P???????g?=??????(62) ???????????????[???????????i?? ??K??? 1 K??????? 1 K????d?x 2 (1?????????;???P?Y???H????,???N????266061; 2???m?????;???????z???????H????,???S???{430074) ????:???????????????u???1?????Q????????????,?y???r?m???y???y???????7,?????Q?????7???????[?? ?????????O???i??,???K???7???}???1?????I???????????????V???H?h.?y???W???7?????[?????????????V ???K?????.,???????y?O???E???P60??90km/h???1????,165/70R10???????????D???[? ??????????E???? ???f????,???K?????)???h.?i?????z???D???[???????????I?E?????????G?????;??????????. ??K??/K???:????????;???[????;???y????;?c?D?????R;???W?7?? ?m???7????:TK311;U463.341K?K????/?(???3:AK?K??????f??:167124512(2007)1120028203 Convectiveheattransfercoefficientattherollingtiresurface HeYan 1 K?MaLianxiang 1 K?HuangSuyi 2 (1SchoolofMechanicalandElectricalEngineering,QingdaoUniversityofScienceand Technology,Qingdao266061,ShandongChina;2CollegeofEnergyandPower Engineering,HuazhongUniversityofScienceandTechnology,Wuhan430074,China) Abstract:Rotatingdiskimmersingagaseousfreestreamflowwasexperimentallyinvestigatedbyu2 singheatandmasstransferanalogyprincipleanddimensionlessequationattherangeofradiusofdisk wasconcluded.Theruleofconvectiveheattransferofdiskwastransformedtotireof165/70R10by usingsimilarityprinciple,andthedependenceofconvectiveheattransfercoefficientofthespecifictire onvelocitywasconfirmedwithintherangeofvelocityfrom60km/hto90km/h.Itisfromtherela2 tionshowedthattheconvectiveheattransferedcoefficientoftirelinearincreasesdwithanincreaseof thevelocity. Keywords:rollingtire;convectiveheattransfer;heatandmasstransferanalogy;naphthalene subli2 mationtechnique;similarityprinciple K?K??A?????????,??,?????y?n?F???????u???? ?E????.?i?????z [1,2] ,?????y?????.???O?????? ?w???????[?????h?z?f?O???O????????.?P???? ?????%?????????z?f?O??????????????,?a?n?i ???0[3??5] ???????O???i??.?+?????i?????????1 ???????????s??????,?u?B?1???????????????? ????.???/[6,7]???????i?????z,???X?.?????? ?????T?v???d??.?P??,?P???????????K???????? ?????????[????????,?k?????????y???????k?? ?7,???????????????[???????d?????7???V??,?? ?)???????????????????O?i??,???Q?????W?7?? ??????165/70R10???????????[???????????E ???????f????. 1K??7?????I 1.1K????y???????7 ?y?[?P?m,?????@???P?????????H?P Email:hean-sd1.com :0202 J02A04200sk02. d1? d1? = 1 RePr 5 5Xi 1+ 1?m 1? Pr Prt 55 Xi , ?A??,?????V?????@???P?????P?P 1?=f(Re,Pr,Xi).(1) K?K??y?????-???????y?m,???????B???-?????P ???y?????H?P dC d1? = 1 ReSc 5 5Xi 1+ 1?m v Sc Sct 5Cd8 5Xi , ?&?????V?????????P?????P?o C=f(Re,Sc,Xi).(2) K?K??h(1)???h(2)???J???u?????h,????,???@?? ?P???????P?????W?;???????????W??,?6?B???H ???????????J???u?????h [8??10] . ?Q?????/[11],???[?????????&???H?????P ?o???H???h Nu=CRem Prn ,(3) ?u???[?d?y?????&???H?P Sh=C1Re m1 Sc n1 .(4) ?6?0???J???????u????????????,????:C=C1, m=m1,n=n1,?h(3)?z?h(4)????????Nu/Sh= (Pr/Sc) n .?P???y?????d?y?????u??,???T???? ?y???????7???????[???????? h/hD=(D/a)n (1?/D)=1?cp(a/D)1-n . K?K??P???u???1?????Q???????6???????????)?? ??,?J??Rec=(1?r+V)r/v???P?7???????????? ?K???Q?????I????????. 1.2K????W?7?? ?Q?????W???7,?6?????????W,???????V???? ?M???{ [12] .?I???????7?????????6?????W?????? ????,???????????????????????i?????{. ?P??,?????f?)???????????7???f?)?????? ?????{,??(Re)t=(Re)m.?I?? (Rt1?t+Vt)Rt/vt=(Rm1?m+Vm)Rm/vm, ?h?m:Rt??Rm?7?4?P???????7?????}??;Vt?? Vm?7?4?P???????O???E???????r?m???i???[?E ??;1?t??1?m?7?4?P???????7???????????E??;vt ??vm?P?6?0?????i????,vt=vm. ???PRt1?t=Vt,Rm1?m=Vm,?I?? Vt=VmRm/Rt.(5) K?K??Q???????i???????{,???????????i?????V ?????????i?????{,???K htRt/1?t=hmRm/1?m,(6) ?h?m:ht??hm?7?4?P???????7???????[?????? ??;1???1??P???????7???y???i?m??????????, 1?=1? 2K????????(?????G 2.1K????????( ?????y?????????;???x???h???r?m???O.?? ???F???G???????I?c?]???????????K??????(?? ??1?I?P)???????m [13] .??????????????5?B?? ????,???B???????????a?u???????F??,?P???P 40mm??40mm??2mm.5?B???????????F???? ?????V?????????P,?7?4?Pr/R=0.5,0.6,0.7, 0.8,0.9.r?P???????m???z???????m????????,R ?P???????}??. ??1K??????????7??????(???Fmm) 2.2K????????G ?P???z?????O?????????X???????,,???r?m ???E???;?h???z?????7???f?c?????E???;?h?? ?u.???7???????En0?z???r?m?????EV?%???? ???????????????Hn0=30V/(1?R).???????E?P 60km/h,70km/h,80km/h,90km/h.???????? ?????0???/[13]. 3K??????7???????????? 3.1K????y???????? ?P?????????????????;,?????F?????????? ???(???O?V?x [13] . ?Q?????y???????7,???d?y?????????????o ?d??????????,?P???????K?I???????i?????I?? ?????????????PNuc=0.00588Re 0.925 c.???????? ?p?P?y???m?????????????H??,?y???????? ???1?????I???????i???D???I?I?????????????G ???;?????????? ??92???k11?EK?K???K????{:???????????????[???????????i??K?K?K? tm tm. 2.2 . 2K??7???y???????[?m??????Nuc ??Rec?????f???? 3.2K??????7?? ???P???????W?a?u,???P?????????2?a???u, ?I???7?????K?????[?????????a?????????y?y?? ???.??. ?H????165/70R10???????P???????????[ ??????????????. ?Q???????(??GB/T297821997,????165/ 70R10?????????f???P486mm,?????P254mm. ?I?????????????????????z?f?????P0.5226.?? ?V?????}???????????}???7?4?????h(5),?? Vt=0.99Vm,?A?h(6),??ht=0.99hm. ???????E?????f?o???????????O???E??60 km/h,70km/h,80km/h,90km/h.??3?S???? ?y?a?u?E???HK3?a?u?F???2?????????I?????[?? ??3K?165/70R10???????????[?????????? ?????V?F?????E???????f???? ???????W,?????H??,?y?u???E???H,???????I?? ???[???????????????V?F?????????u?o?o????, ???i?????????????k?G???;???f,???????????? ?O???;???),???K???H???h: K?Vt=90km/h,{hr}W/(m 2 ??K)= 665+835R;() K?V=8,{}W(??K)= 556+633R;(8) K?Vt=70km/h,{hr}W/(m 2 ??K)= 82.22905+69.69344r/Rt;(9) K?Vt=60km/h,{hr}W/(m 2 ??K)= 74.00930+62.72677r/Rt,(10) ?h?m,r/Rt?P?????I?????z?????}???%??. ???h(7)??(10)?y?????V????0.5226??1?? ???O???7,???]???????2?E???H???D???[?????? ??:Vt=90km/h??,hr=154.6028W/(m 2 ?? K);Vt=80km/h??,hr=148.1961W/(m 2 ?? K);Vt=70km/h??,hr=135.2867W/(m 2 ?? K);Vt=60km/h??,???D???[?????????Phr= 121.7632W/(m 2 ??K). ??4?S?????2???E???H???D???[?????????? ??4K????D???[???????????E???????f???? ?E???????f????.????4?????H??:???E?????? ??,???D???[?????????G?????;??????????.???? ???O????,???K?????????D???[???????????E?? ?????f?????P {ht}W/(m 2 ??K)=44.3911+1.29428{Vt}km/h. K?K??k?i???B?1???????z??????????????,?i?i ?????????5?y???????O???E???P60??90km/h ??????.?????????????E???????????[????????, ?????y???;?????r?m???O?i??. ???1???/ [1]?d????.?????????z????[M].?S??:?f?????T???G ?p,1988. [2]??????.?????????????????i??[D].????:???????? ?;????????,2004. [3]SchuringDJ.Therollinglossofpneumatictires[J]. RubberChemistryandTechnology,1980,53:6012 727. 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