HX4135-020-12JS航速及螺旋桨计算书

标记日期共9页第1页广州船舶及海洋工程设计研究院审核日期审定标检校对标记总面积m2编制签字GCY935-020-12JS航速及螺旋桨计算书数量修改单号3t航标工作船送审设计航速及螺旋桨计算书HX4135-020-12JS共9页第3页1.主要参数船体设计水线长Lwl98.34m垂线间长Lpp95.40m型宽B17.5m型深D9.5m设计吃水T6.8m湿面积Sm2满载排水量△t浮心纵向位置LCBm方形系数Cb0.8122棱形系数Cp0.816主机及齿轮箱主机型号NT855M300主机数量Z1主机额定功率P1324kw主机转速No750rpm齿轮箱减速比i3.03螺旋桨螺旋桨数量1螺旋桨转速N247.52rpm桨轴中心距基线Zp2.500m螺旋桨直径D2.647m系数及效率伴流分数w0.271推力减额分数t0.250船身效率ηH=(1-t)∕(1-w)1.029相对旋转效率ηR1.00轴系传送效率ηS0.96齿轮箱效率ηG0.97温度修正系数ηt1.002.阻力及有效马力计算C△=△/(0.1L)3=7.08船模湿面积Sm=S/(L/Lm)2=1.17m2Lm＝2.25序号单位1实艇VKn9.510.010.511.011.52实艇vm/s4.8875.1445.4015.6585.9163Fnv/(g*L)0.50.1570.1660.1740.1820.1904船模Rt按C△查图16-16N7.8009.20011.00013.20016.5005船模vmm/s0.7390.7780.8170.8560.8956船模Ct2.4E-022.6E-022.8E-023.1E-02######7船模Re1.5E+061.5E+061.6E+061.7E+06######8船模Cf4.3E-034.3E-034.2E-034.2E-03######9Cr2.0E-022.2E-022.4E-022.7E-02######根据《内河船舶设计手册》第279页提供的计算表计算。符号及公式数值航速及螺旋桨计算书HX4135-020-12JS共9页第4页10实艇Re4.2E+084.4E+084.7E+084.9E+08######11实艇Cf1.7E-031.7E-031.7E-031.7E-03######12实艇Ct2.2E-022.4E-022.6E-022.9E-02######13实艇RtN0.0E+000.0E+000.0E+000.0E+00######14实艇PEkW0.0000.0000.0000.0000.000kW0.0000.0000.0000.0000.000hp0.0000.0000.0000.0000.0003.推力及航速计算本艇采用MAU型4叶螺旋桨，设计功率储备取5%。螺旋桨敝水收到马力PD=P×(1-0.05)×ηt×ηG×ηs=1609hp序号项目单位1假定船速Vkn12.51211.51110.52VA=(1-w)Vkn9.1138.7488.3848.0197.6553PD0.5hp40.11740.11740.11740.11740.1174VA2.5kn250.665226.346203.500182.096######5N247.52247.52247.52247.52247.526BP=NPD0.5∕VA2.539.61443.87048.79554.53161.2567Bp0.56.2946.6236.9857.3847.8278δ71.90174.89778.15381.70685.596ηo0.5250.5430.5600.5760.590P∕D0.6800.6900.6920.7020.712PTE=PDη0ηHhp869.544899.357927.513954.014######ηo0.5120.5290.5450.5630.578P∕D0.6860.7000.7010.7110.724PTE=PDη0ηHhp848.012876.169902.669932.482######带附体PE1.2PE15数值MAU4-40MAU4-55航速及螺旋桨计算书HX4135-020-12JS共9页第5页根据表中的计算结果可绘制Pe、δ、P/D及ηo对V的曲线，如图所示：从PTE－f（V）曲线与船体满载有效马力之交点，可获得不同盘面比所对应的设计航速及螺旋桨最佳要素P/D、D及ηo如下表所列：MAUVmaxP/DηoMAU4-4011.070.7000.575MAU4-5511.020.7130.56050607080901001101201301401501601701801902009.51010.51111.5MAU4-40-PTEMAU4-55-PTEPEMAU4-40-ηo*150MAU4-40-(P/D)*150MAU4-55-ηo*150MAU4-55-(P/D)*150航速及螺旋桨计算书HX4135-020-12JS共9页第6页4.空泡校核按柏利尔空泡限界线进行空泡校核，计算不发生空泡之最小展开面积比。桨轴沉深hs＝T－Zp＝1.45-0.610＝4.300mpo－pv＝pa+γhs－pv＝14426kgf/m2计算温度t＝15℃，pv=174kgf/m2,PD=247hp,ρ=101.936kgf.s2/m4MAU4-40MAU4-551Vmaxkn11.07011.0202VA=0.5144Vmax(1-w)m/s4.1514.1323(0.7πND/60)2(m/s)2576.100576.1004Ve2(m/s)2593.333593.1785σ0.70.3620.3626τc=(查图)0.1780.1787T=PDηo75/VAkgf##############8Ap=T/(0.5ρV20.7rτc)m23.1043.0399AE=Ap/(1.067-0.229P/D)m23.4233.36310AE/Ao=AE/(D2π/4)0.6220.612项目单位序号数值0.40.450.50.550.40.450.50.55(P/D)/1.5ηo/1.1要求的Ae/AoVmax/25给定的Ae/Ao航速及螺旋桨计算书HX4135-020-12JS共9页第7页根据上表计算结果，可求得不发生空泡的最小盘面比及所对应的最佳螺旋桨要素。盘面比AE/Ao=0.519螺距比P/D=0.709直径D=1.20m航速v＝11.05kn效率ηo＝0.5635.强度校核本校核按《CCS钢质内河船舶入级与建造规范》（2002）进行。螺旋桨在0.25R剖面处的桨叶厚度t不得小于按下列式计算所得之值：mm式中：1.200m0.868m0.868m203kw4b0.25R剖面处的桨叶宽度254.78mmne螺旋桨额定功率时的转速494r/min10（o）1.00代入计算得出t＝36.6mm叶梢处的厚度t1.0应不小于按下式计算所得之值：t1.0＝CoD，Co＝3代入得t1.0＝3.6mm本船实桨t0.25＝45.9mm，t1.0＝3.6mm，满足规范强度要求。6.螺旋桨的质量与惯性距6.1桨叶重量计算：Gb=3.85C2C3C4γ(AE/Ao)t0D2式中，C2=C3=1.0,t0=60mmC4=0.15(t0+t1.0)/t0-0.089=0.07求得Gb=100.95kg6.2桨毂重量计算：Gn=0.59dn2lnγ(kg)dn=216mmln=250mm所以Gn=57.88kgZ桨叶叶数P0.70.7R剖面处的螺距P0.250.25R剖面处的螺距ε桨叶后倾角K材料系数（锰黄铜）D螺旋桨直径；Ne主机的额定功率])1000)(25.0035.0([)5.35.1(104.3225.07.05DnKZbnNPDPDteee航速及螺旋桨计算书HX4135-020-12JS共9页第8页所以整个桨的桨重为：G=Gb+Gn=158.83kg6.3惯性距I=0.065C1GbD2取C1=1.04=9.83(kgf-cm-s2)7.系柱特性的计算当P/D＝0.709时，按J＝0,查MAU4-40和MAU4-55的KT-KQ-J图得到：MAU4-40KT=0.280KQ=0.03MAU4-55KT=0.301KQ=0.033当AE/Ao=0.519，插值得KT＝0.297KQ=0.032计算功率PD=247hp系柱推力减额分数取to=0.04主计转矩Q=PD×60×75/（2πN）=4658.89kgf.m系柱推力T=KT.Q/KQ.D=2732.36kgf车叶转速N=1429.0rpm7.实船性能预估7.1插值得到螺旋桨的敞水性征曲线，并作出相应的KT/J2曲线，如图：δBP^0.5ηoJKT10KQKT/J211011.326200.389270.280550.224740.257912.8554910210.240330.417070.302550.217630.251392.37759908.677930.462480.342890.205330.242411.74642847.884130.492070.367380.196150.233191.4533787.104130.520480.395640.183970.222671.17526706.094130.562890.440860.166090.207130.85458645.360330.59810.482190.151180.194070.65021564.332400.639130.551070.11760.16150.38726523.820670.648580.593460.097090.141460.27567＝QKDQ5/60航速及螺旋桨计算书HX4135-020-12JS共9页第9页7.2按照1978年ITTC标准预估方法，计算表格如下：序号项目1假定航速Vs(kn)9.51010.51111.52Vs(m/s)4.8835.145.3975.6545.9113实桨进速Va(m/s)3.559713.747063.934414.121774.309124有效阻力Rt(N)0.0E+000.0E+000.0E+000.0E+000.0E+005实桨推力T(N)000006实桨负荷系数KT/J200000在设计桨的KT/J2曲线上，查得对应于各实桨负荷系数得点，由此可得实桨的J、KQ及ηo，并安下表计算实桨收到马力PD：序号项目1实桨进速系数J0.4820.4740.460.4430.4222实桨敞水扭系数10KQ0.1850.1910.1960.20.2153实桨敞水效率ηo0.5980.590.5790.5650.5474实桨转速n(r/min)369.26395.26427.65465.21510.565实船推进效率η0.6150.6070.5960.5810.5636实船收到马力DHP00000由上表的计算结果，得出ITTC标准预估船速Vs与螺旋桨转速n及收到功率PD之间的关系，并绘制成图如下：数值数值00.511.522.530.250.350.450.550.65JKt10KqKt/J2ηo航速及螺旋桨计算书HX4135-020-12JS共9页第10页01002003004005006009.51010.51111.5Vs(kn)Vs~BHP,nBHP(hp)n(r/min)