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    ڣ2022-10-03  Դ  ߣ  
    ΪоܸƵĹüѧԽܸƽֵ棬ͨģΪоܸƵĻֵʵƽ̨ŻĽṹͬʱΪܸṩ˵ͳɱڵƷ......

     

            ܸһִͳıƣнṹ򵥡ɿѹʧСȶɲʵŵ㣬㷺Ӧڲ¡ѹʴʡĿǰܸƲþ両ʽ㣬ϵαܵ״ŵȶصӰ죬Ҫʵ궨ȷƷдʵ飬ðںܳһȡޡΪоܸƵĹüѧԽܸƽֵ棬ͨģΪоܸƵĻֵʵƽ̨ŻĽṹͬʱΪܸṩ˵ͳɱڵƷ
         1 ԭ
          1.1 ܸƵĹԭ
     
          ͼ1ΪܸƵĹԭʾ⡣ڴֱ׶ιУһӡ¶ϴ׶ʱܵӭ赲һѹӶԸγϵͬʱ屾ԣԸӲĺڸӱʱӾͻͬʱ׶ιʵĻͨټͣʱӶüС.ܵﵽƽʱӾͻͣijһ߶ȡͳĽܸƲþ両ʽ㣬
                       
          ʽУqvΪƵαΪϵD0ΪӷdzӭֱhΪ׶еĴֱλãφΪ׶ιܼнǣVfΪρfΪӲܶȣρΪܶȣAfΪӴֱķdz
          1.2 ѧƷ
          ѧcomputational fluid dynamicsCFDһüɵĿƷ鼼漰ѧ㷽ͼͼδȼΪ˼㣬ԲѹΪдʹõk-εģͨʽƷֱ̡ϵУԷ̺ŵʱN-S
          
     
          ŵ
                       
          ʽУuiΪƽٶȣPΪƽѹννtֱΪϵϵ
          Ըϵļ㹫ʽΪ
          νT=Cμk2/ ε                                               4
      

     
          kεɸԵ˷̵õԸReK
            
          ε
                  
          ʽУGkΪĶܲ
          
          DÿΪƽӦ
          ߵķģͽзʵĻϣģдڵٶΪֵһãԲٶ棻ͬʱʵƵĹ죬Ƶڴ뵼ܣӶ˷׼ȷԡ
          2 ģͽֵ
          25mmھDN25ڲеṹͷܸƽṹͼ2aʾܸƲ1Cr18Ni9TiʡΧΪ0.4~4.0 m3̱Ϊ101Ϊ˼׶иӵλãڸаװyongjiuͬʱ˸ڲṹģͣͼ2bʾʵõĵڳܶΪ998.0 kg/m3Ϊ0.001002 kg/m.sˮܸڲǸŵȫչʲģʽб׼һģ㡣
     
          2.1 ٶ趨
          ٶɾԹ⻬Բٶȷֲָʽʾ
     
          ʽУurΪڽ뾶ΪrٶȣRΪԲڴ뾶mΪŵĴС1umaxΪԲĴķdzٶȡ
     
          ʽУqΪAΪڵļԱоA=2πR2m2/[2m+1m+1]
    1 mŵĹϵ 

    Re
    m
    4.0×103
    6.0
    2.3×104
    6.6
    1.1×105
    7.0
    1.1×106
    8.8
    2.0×106
    10.0
    3.2×106
    10.0

          Ϊʹģ㲻ͬھܸƵķCqͨӦֿھܸķģ͡
          ʽ£
          qc=Cqq                               9
          ʽУqΪʵqcΪCqΪӣ25mmھĽܸƣCq=1.13
          ʽ8~ʽ11дٶȷֲͼ3q=4.8 m3/hʱܸٶķ档ͼɫɫɫůɫʾٶС󣬴ͼпؿӱ߱ڵĵٶСķԷֲ
     
          2.2 ߽趨
          
          ڸڱòֲϣݱ趨ֲڸ߶Ks=0.04ֲڳCs=1
          
          Ķ
     
          ɢ
     
          ʽУuavΪƽٶȣCμΪLΪܸڲ߶ȡ
          3
          ͼ4˲ͬ£õĽܸڲϵٶαɫͼؿܸڸΧԼڵٶȷֲӣڹеλ֮ܵ价϶ڹеٶȷֲҲ֮Ա仯ͨ۲αɫͼеٶȷֲѧԭԳжϳýǺġ
               
          ʵ˸׶ijһ߶ȴѹ͸Gf 3ĺиܺ2Ϊ
    2 ܺFfķԼֵʵıȽ 

    Ӹ߶h/mm
    Ff/N
    ʵqp/m3·h-1
    qs/m3·h-1
    δs/%
    4.86
    0.1986
    0.4
    0.3853
    -0.3660
    9.36
    0.3955
    O.8
    0.7746
    -0.6342
    14.41
    -0.0790
    1.2
    1.2298
    0.7447
    19.28
    -0.2751
    1.6
    1.7246
    3.1159
    23.97
    -0.4258
    2.0
    2.2188
    5.4695
    28.65
    -O.3175
    2.4
    2.5670
    4.1739
    32.77
    -0.354 7
    2.8
    3.0029
    5.0727
    36.89
    0.3755
    3.2
    3.3898
    4.7447
    40.44
    -0.3435
    3.6
    3.8056
    5.1409
    44.00
    -0.2853
    4.0
    4.2134
    5.3355
    47.19
    -O.O518
    4.4
    4.4605
    1.5125
    50.00
    0.329 2
    4.8
    4.6147
    -4.6317

          ɱ2֪øڸλõĺӽ㣬ƽ⣬Ϊ֤ģܴﵽķ澫ȣݸֻܺΪʱƽ⣬ּ˸ڸ߶ȱƽ⣬ΪʱӦ2гֵʵıȽϣʵռ
     
          ʽУqsΪֵģm3/hqpΪʵ
          ɱ2ֵ֪ʵķdzΪ5.4695%ƽΪ2.4731%ñģͶ50mm80mmھܸƷʵݵıȽϽҲ൱ӽ߹ģ͵õĽ
          4
          ͨѧܸз棬˶ڽвֱͬλõСƽʱӦʵʵȣdzΪ5.4695%ƽΪ2.4731%߹ĽֵܸģܹȽʽܸҪΪܸƴṹһŻṩ˿ɿֵƽ̨
     

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