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compressors was the inducer. And then, in typical turbine, we may also have a diffuser, downstream of the rotor to recover part of the kinetic energy, which would otherwise be lost. And, I think, we also discussed two other aspects of radial flow turbines. They are the efficiency and performance parameters. We defined different forms of efficiency, the total-to-static efficiency and how it is related to total efficiency and the work output and so on. We also discussed or spent quite some time discussing about the different loss parameters, which are used in radial turbines, like the nozzle flow coefficient on the rotor flow coefficient. We also look at the incidence losses, which is the flow entering the rotor, need not necessarily be at the 0 incidence. Under off-design conditions, the incidence angles could be quite high, which leads to a substantial increase in the losses; that is, an additional component of loss that comes into picture when a turbine is operating in an off-design condition. So, these are the different loss mechanisms that we discussed in a little bit detail. We, then of course, spent lot of time discussing them because I think, it is fairly out of the scope of this course to discuss the loss mechanisms and design optimization techniques in detail; that it is a vast subject on it is own. So, I decided not to spend too much time on that. We will discuss some aspects of design and performance in the next class. But, today’s class I thought it is a good idea to have a tutorial session. We shall be discussing a few problems, which I will solve for you here. And then, I also have a couple of exercise problems, which I think, you should be able to solve based on what we had discussed today as well as in the previous class. So, today’s lecture is going to be a tutorial session. So, let us take a look at the first tutorial problem that we have. Let us take a look at what the problem statement is.PDF Image | Turbomachinery Aerodyanmics
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