Mechanical Engineering - Steam Nozzles and Turbines - Discussion
Discussion Forum : Steam Nozzles and Turbines - Section 1 (Q.No. 10)
10.
The critical pressure ratio for initially wet steam is
Discussion:
13 comments Page 2 of 2.
Saikumar said:
1 decade ago
The answer is coming as 0.577 and 0.5776 by substituting above values.
Raj said:
1 decade ago
For wet steam n1=1.132,
For super heated steam n2=1.35.
So n2>n1
Then value of p2/p1 will decrease from n1 to n2.
For super heated steam n2=1.35.
So n2>n1
Then value of p2/p1 will decrease from n1 to n2.
Lakshmi Kant said:
1 decade ago
The critical pressure ratio in nozzles for max. discharge is,
{P2/P1}= [2/(n+1)]^{n/(n-1)}.
For saturated steam, n= 1.135.
Therefore, P2/P1 = [2/2.135]^(1.135/0.135).
= 0.58.
Clearly for wet steam, it will be slightly more than the above value. Hence, for wet steam,
P2/P1 = 0.582.
{P2/P1}= [2/(n+1)]^{n/(n-1)}.
For saturated steam, n= 1.135.
Therefore, P2/P1 = [2/2.135]^(1.135/0.135).
= 0.58.
Clearly for wet steam, it will be slightly more than the above value. Hence, for wet steam,
P2/P1 = 0.582.
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