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 1 of 2.
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.
Saikumar said:
1 decade ago
Steam where most of the process occurs in the wet region: n = 1.135.
Steam super heated: n = 1.30.
Air: n = 1. 4.
Methane: n = 1.31.
Helium: n = 1.667.
Steam super heated: n = 1.30.
Air: n = 1. 4.
Methane: n = 1.31.
Helium: n = 1.667.
Mani Selvan said:
6 years ago
For wet steam n=1.113.
If substituted in eqn p2/p1=(2/n+1)^(n/n-1), we get p2/p1= 0.581963802, which is approximately equal to 0.582.
If substituted in eqn p2/p1=(2/n+1)^(n/n-1), we get p2/p1= 0.581963802, which is approximately equal to 0.582.
Sharad said:
9 years ago
N is the indix for steam.
N for superheated steam is 1.135.
N for dry saturated steam is 1.3.
Then N for wet steam is?
N for superheated steam is 1.135.
N for dry saturated steam is 1.3.
Then N for wet steam is?
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.
Vijay said:
9 years ago
The critical pressure ratio is 0.58 because n= 1.135 for wet steam and critical pressure formula is given above.
Saikumar said:
1 decade ago
The answer is coming as 0.577 and 0.5776 by substituting above values.
Sohan said:
7 years ago
Superheated or supersaturated=0.546.
Dry saturated=0.578.
Wet=0.582.
Dry saturated=0.578.
Wet=0.582.
Raviraj said:
9 years ago
The answer is 0.577 as for wet stream n=1.135.
Raju said:
8 years ago
What is the value of n when steam is wet?
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