五、湿饱和蒸汽
由ts（或ps）与x共同确定：
vx?xv''??1?x?v'?v'?x?v''?v'??xv''
x较大时
hx?xh''??1?x?h'?h'?x?sx?xs''??1?x?s'?s'?x?s''?s'??s'?x
ux?hx?psvx
0?x?1
?Ts
v?v'
v'?v?v''
未饱和水湿饱和蒸汽过热蒸汽
v?v''
水蒸气表
2.未饱和水和过热蒸汽表
p饱和参数t℃0102040506080100120
0.001 MPa
ts =6.949 ℃
v’=0.001 000 1, v”=129.185h’=29.21, h”=2513.3s’=0.105 6, s ”=8.9735vm3/kg0.0010002130.598135.226144.475149.096153.717162.956172.192181.426
hkJ/kg-0.052519.02537.72575.22593.92612.72650.32688.02725.9
skJ/(kg·K)-0.00028.99389.05889.18239.24129.29849.40809.51209.6109
0.005 MPa
ts =32.879 ℃
v’=0.001 005 3, v”=28.191h’=137.72, h”=2 560.6s’=0.4761, s”=8.3930vm3/kg0.00100020.00100030.001001828.85429.78330.71232.56634.41836.269
hkJ/kg-0.0542.0183.872574.02592.92611.82649.72687.52725.5
skJ/(kg·K)-0.00020.15100.29638.43668.49618.55378.66398.76828.8674
0.01 MPa
ts =45.799 ℃
v’=0.001 010 3, v”=14.673h’=191.76, h”=2583.7s’=0. 649 0, s”=8.1481vm3/kg0.00100020.00100030.00100180.00100914.86915.33616.26817. 19618.124
hkJ/kg-0.0442.0183.87167.512591.82610.82648.92686.92725.1
skJ/(kg·K)-0.00020.15100.29630.57238.17328.23138.34228.44718.5466
水蒸气表
?情况一：已知（p,t）
查饱和表得已知压力（或温度）下的饱和温度ts(p)（或饱和压力ps(t) ）：
t(p)未饱和水 t??s?
?t?ts(p)饱和状态或湿蒸气（给出干度x）?t?t(p)过热蒸气
s?
?在湿蒸气区，p、t不是两个独立的变量，因此不能由p、t确定状态点。
?情况二：已知p（或t）及某一比参数y（v或s或h）：查饱和表得已知压力（或温度）下的y’、y”：
?y?y?未饱和水?
?y??y?y??湿蒸气（算出干度?y?y??过热蒸气?
x）
在湿蒸气区干度及其它参数的的计算：
y?y?x?
y???y?
v?v??x(v???v?)s?s??x(s???s?)h?h??x(h???h?)
工程热力学 水蒸气 - 图文
