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船模阻力实验一、实验准备及安装要点船模在拖曳水池中进行阻力实验,必须进行一系列实验准备工作。1.制作船模:船模与实船要求几何相似,并表面光洁,加工误差在一定的范围内。2.激流:一般应用的激流方法是在船模首垂线后L/20处,装置直径为1毫米的金属激流丝。3.称重:按縮尺比的要求计算喜欢摸的排水量并进行称重,加压载,以满足实验所要求的型排水量和吃水。4.安装:船模安装在拖车上,应使其中纵剖面与前进方向一致,拖力作用线位于中纵剖面内,其作用点在水线面附近的位置上并保持水平。试验中的进退、纵摇、升沉运动应不受限制。二、模型参数和实验数据1,阻力实验相关参数满载池水状态水线长度:L=3.803m满载池水状态浸湿面积:S=2.737㎡模型縮尺比:=40实验水温:t=淡水20°C2,满载池水状态船模拖曳阻力实验数据实际车速(/)mVms阻力()mRkgf0.7060.3500.8150.4500.8740.5160.9340.5911.0210.7091.1810.9761.2591.1261.3141.2691.3831.474三、阻力换算二因次法:)(tmfmfstsCCCC淡水20°C,)(sm/100374.0126-,3998.16/kgm20.075(lgRe2)Cfm,Revlm,212RtsVsSs,2,VsVmSsSm数据处理如下表:)/(msmvmRemfC)/(smvmsResCf0.70626749140.0038264.4656767056180.0016080.81530878960.0037215.1557811828310.0015790.87433114370.0036715.5288377347170.0015650.93435387670.0036255.9078952451090.0015521.02138683950.0035646.4579786351780.0015351.18144746080.0034677.46911319962250.0015071.25947701370.0034267.96312067597350.0014961.31449785220.0033998.31012594775950.0014881.38352399520.0033678.74713256145460.001478()mRkgf)(NRmmCtsCt)(kNRs)(kwPe0.3503.4340.0050430.0028241235490.4504.4150.0048650.0027231588150.5165.0620.0048510.00274518310130.5915.7980.0048650.00279321312580.7096.9550.0048840.00285526016800.9769.5750.0050250.00306537427921.12611.0460.0051020.00317143934991.26912.4490.0052780.00336750842231.47414.4600.0055340.0036456105332四、船模阻力实验曲线(mmVR曲线)1、mmVR曲线2.VS-RS曲线
本文标题:船模阻力实验实验报告
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