孔珑 - 第三版 - 流体力学习题答案（目前最新最全）（亲们，找了很久才找到的，下载的都先请我吃饭啊） - 图文

pe2?pe1??gH???2r22??gH (7)

则作用在底面的总压力为

Fp2???pe2dA??d2dd??2r2??2r2222???????gH2?rdr??2?rdr??gH2?rdr?F???gHrp1????d2A0?2?0d202?F???gH??d?F12p1?2???p1?4??gHdFp2?157600??3?900?502?14?14???900?9.80665?1.5?12?11609?N? （3）由式(3)可知，作用在上盖边缘的计示压强为

2?2??d?p2???2d2e1b????2?8 则作用在侧面的计示压强为

2pd2e3?pe1b??gh???8??gh 设圆柱体的侧面积为Ac，则作用在侧面的总压力为

F???2d2?p3???pe3dA??H2????2d2?dA??????ghdA?????cAc?8???0?0??8gh??2d?dh??H2??????2d2??dH2?0?0?8??2d?dh??0?0??gh?d2d?dh???2????2d2??8??dH?2?0dh??gd0d??2?H0hdh?2?0d? ???2???d2?d?gdH2?8???2?H?2??2?2?2????2d3H??gdH2?8?2将式(5)代入，得

0(8)

(9) (10)

(11)

??n?????d3H??gdH2?3?n2d3H??gdH230?? (12) Fp3????8272002Fp3?

2?3?900?502?13?1.5??900?9.80665?1?1.527200?2?45728?N?