作者caseypie (追悼)
看板KenShin
标题有点小错误
时间Sun Jul 4 21:49:19 2004
※ 引述《caseypie (追悼)》之铭言：
有个地方有错....
: 用能量守恒修正白努利方程式:
: PV=0.5mv^2+P'V'
^^^^^^^^^^^^^^^^^^^^^^
应该改成: 3PV/2=0.5mv^2+3P'V'/2
: PV^1.33=P'V'^1.33
: 令气体共一莫耳
: 得:V=0.0246m^3,所以PV=2491.98
: PV^1.33=733.758
: 2491.98=0.5*0.0288v^2+P'V'=0.0144v^2+140.982*P^0.25
以上式子改成:
3737.97=0.0144v^2+211.473*P^0.25
推导结果亦修改如下:
P'=3P/4 => v=125.56m/s=0.3793mach(用音速=331m/s来算)
P'=2P/3 => v=151.13m/s=0.4566mach
P'= P/2 => v=198.17m/s=0.5987mach
P'= P/3 => v=245.98m/s=0.7431mach
P'= P/4 => v=272.62m/s=0.8236mach
P'= 0 => v=509.49m/s=1.5392mach
就是这样
感谢大家对天祥龙闪的支持
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 218.165.14.24