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So, that completes the third problem that we had set aside for today’s tutorial. So, I have one more problem to solve, which is a very simple problem, basically not involving in the calculation. But, this is just to compare performance or operation of two different types of turbines that we have discussed about. One is the axial turbine, which we had rather detailed discussion, several lectures earlier on and of course, the radial turbine. So, let us compare under certain given operating conditions, how the work output of these two different turbines can be calculated and how do they compare with each other. (Refer Slide Time: 46:27) So, the fourth problem statement is the following: Compare the specific power output of axial and radial turbines in the following cases. Axial turbine, in this case is given as alpha 2 is equal to beta 3 is 60 degrees and alpha 3 is equal to beta 2 is 0 degrees. For the radial turbine, alpha 2 is given as 60 degrees and beta 3, alpha 3, beta 2; all of them are 0. If the rotational speed is the same in both this cases, we are required to calculate this specific power output. So, what we can see is that immediately for the axial turbine, we have, we can see that alpha is equal to beta 3 and alpha 3 is equal to beta 2. Immediately, tells us that this is a 50 percent reaction turbine, which means that the velocity triangles would be symmetrical. And, for the radial turbine we have already seen the velocity triangle, which is for the nominal operation condition, where alpha 2 is given, beta 2 is 0, alpha 3 and beta 3 are respectively 0 at the exit. (Refer Slide Time: 47:36)PDF Image | Turbomachinery Aerodyanmics
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