The Benefits of Using CFturbo for Turbomachinery Design

Hello, this is Ertan Taskin from Ozen Engineering. In this video, I will be demonstrating the benefits of using CFturbo for turbomachinery design. When you open CFturbo, you will see the following screen. As you see, there are multiple options for us to select.

We can work on pumps, fans, compressors, gas turbines, hydro turbines, etc. In this particular example, we will work with a fan application. So when I click the fan, I am asked a few questions about the operating conditions.

This is a very critical step because the type of the fan, or in case of a pump, it's going to be decided by the software accordingly, from centrifugal to the axial and all the way. We will explore this now. Let's start with some generic operating conditions.

Let's assume I'm going to use 5 cubic meters per minute. So I will use 5 cubic meters per minute. And I will use the 5 cubic meters per minute. And let's add this air pump. I will also use the pool pump.

I will use the Superfluid for one representative, and we will see how the OS will be displayed in the next second. I will use the spoon pump, not bevida. So let's try this one. I will use this button in the next few seconds.

As you can see, if you run this kind of application with various 1200 watts and envisioned flow internal control, it will be what the queue and will run. But let's see what we are actually doing.

So the things that we are going to be working on are: 1. Automatically turning on the air pump, 2. Turning on the fan on the axis after counting all passengers for rain or snow conditions, 3. Turning on the throttle, which will focus the water flow jet, 4. Checking the lag that you have placed before.

You can also see the specific speed and higher the specific speed, of course, the type of the device changes from centrifugal to the axial. So manipulating or playing with all these numbers is going to change the specific speed as well as the type accordingly.

Let's explore what happens if I change the pressure generation. Let's say I want to actually generate a bit more pressure. As you see, from axial to the mixed flow condition, I came from this change. If I make this two, it continues to go to the centrifugal side.

And as you see, it's actually more of a centrifugal type right now, with a specific speed of 36. 2. CFturbo works on a specific speed range. Lower specific speeds are not really preferred.

That's why it is better to tailor the operating conditions accordingly, and the software will be helpful for us. Let's click "OK" on this. We are going to use "mokkaum" because we are going to set up a central diesel unit.

Here, for example, we are going to put this capacitor here and let it sit on an ongoing center in our unit. It's going to be solid and carpeted at this moment for reverse engineering purposes, utilizing the CAD file to initiate a CFturbo model. But in this example, we will design the impeller.

So let's click the "new centrifugal impeller." On the screen, there are some additional parameter settings and dimensions provided here.

I will not make any modifications, but I'm going to let the software decide all the others based on the initial settings that we have, such as the impeller diameter, suction diameter, etc. Right. So I'm going to come here and click this "complete all design steps" button.

And with that, we have our initial design. And on the Meridian screen shown here, if I click on the 3D model, you will see the impeller blades as well as the hub and the shroud design for this particular case. So let's examine other features here.

In this view, in the Meridian view, we have the shroud geometry. We have the hub geometry, the inlet region, and outlet region. And this particular one is the impeller. So we can go through the design steps one by one to explore other features, such as making the design shrouded or unshrouded.

In this case, initially, it was unshrouded. So let's assume it was shrouded. I'm sorry. Let's let's assume we have an unshrouded design, which means there is a clearance between the blade tip and the shroud. So when I click "OK" on the 3D model, you will see we have a tiny little gap.

We can definitely change it between the blade tip and the shroud. This is what we want to work out. So at this level, we are at. Okay. So it's not just this small little ridge, but a crooked shape and this "sådan" edge. For the part that is exposed to ground, there is this big piece right here.

That is the bone and the joint. And it has not even a small little bump. And, of course, greater flaws. In this case, what you have noticed is that the shape of the hub is different. This offset is actually what I have provided.

And if you want to see since we have an error, we cannot see in the 3D model. But now we're going to play with the features. It's actually very easy to drag and drop a type of operation as you see.

Either we can eyeball it or what we can do is actually take a look at the numbers and then actually put the corresponding numbers here, such as 10 here. Fully straight. This would be let's say 47 millimeters. And let's make the same thing on here. 47 millimeters. So it's actually perfectly straight.

Okay. See, we have initiated; we have created a hub. A cylindrical hub at the center. And the blades are actually far away from that. We can definitely make a modification on that too. So let's get to the meridional contour again and make a change on the leading edge. This is the leading edge.

This is the trailing edge. So let's play with this. So I can actually play with these Bezier notes here to drag and drop and change the profile based on whatever I want, whatever makes sense for my application. Let's see how the things are now. We change the impeller design accordingly.

On the 3D design, you see how it is actually modified. Okay. So we have the 3D design. So we have the paid empire as the back down, cross-section of the blade. One is actually very close to the shroud. So we can manipulate the blade profiles from these two locations.

But if we want to make actually twisted and curved blades, we should include other spans. Let's assume I want to have five spans. So which means I'm dividing the blade into five different locations. So that at each line, I can change the profile of the blade for however I would like to do.

On the 3D model, you will see all these profile locations are set. Similarly, if I want to change the design blade lines, these are the lines that we created already. The leading edge region, the trailing edge region, with all these different spans.

Since we let the software decide on the blade profile, currently, it is locked. We are not able to modify them on the screen. But of course, we can go back and change, and then we can make our own blade profiles accordingly. But let's assume this blade design is good for us.

And but do we know how good is this? Right. So it's actually fairly easy to again go to the performance prediction. Now, you know that we already specified the operating conditions, the best operating condition, right? And this is actually corresponding to the performance prediction.

So we can actually see the performance prediction. And this is the HQ curve. This is the head column. And this is the flow column. And this is the corresponding characteristic curve for that particular speed.

And if you hover over it, you can actually see on this portion of the plot, you can see the corresponding pressure differential for that corresponding flow condition. Right? And also, you may also want to add additional speeds. So let's get to here.

We can either add all these preset speeds or we can actually change that to some round numbers. And let me include that in. So this is actually 2500 RPM HQ curve. Let's. Make this 3000. So at 500 RPM intervals, we're going to have our HQ curve listed. Similarly. 4000. There you go.

This is the 4000 curve. And let's say this is 5000. I'm sorry, 45, 4500. Okay. So let's go to the next one. There you go. So it's actually very useful tool. So we have all the characteristic curves of this pump. And based on all these curves. And if we are happy with this design. And there you go.

We are done with it. So let's assume. Let's assume this design is pretty good. But before doing anything else, let's pay attention to these warnings here. So if you click on these warnings, actually a new screen opens up, just to tell us what should we do about that? What is that?

For example, this error is or warning. And how can we get rid of this problem? So the S over D2 requires Delta H equals zero is the warning that we have. And now it's telling us that let's select different parameters. Let's say one of these parameters is zero.

And then it's telling us that in the calculation of suction diameter. So that means we should be going to. To the screen. And. Changing. This one, this was the, this was the problem here. This should be zero based on. I'm sorry, this should, this should be some, some other parameter.

Relatively net flow angle. Let's see if this is going to work for us. Yes. What are the problems that we have? Here. Let's try to play with the number of blades and see if that's going to help us. Let's get here. Now, originally we have seven number of blades.

Let's assume we want to have more blades. And see the impact of that. And as you see that warning is already eliminated. Let's see how the three-dimensional model looks with these modifications. Yes. Also. Let's check the performance prediction curves. Yes. With the, the new additions.

Believe the blade. The curves are slightly different than what we have. And again, we, if you hover, we're going to definitely see how much of a pressure that we can generate at this specific particular speed. And that particular flow condition.

One final thing that we may want to have is a few more things. If we want to have a more precise flow. Then we can. We can export this to the any CAD format as well as to the other Ansys tools for the further processing.

We can definitely bring this to a CFT solver, creating the mesh, and then solving it. And that's going to be a separate video to demonstrate the details of the sequence. And there. So we can see here the details of this.

So, in this video, we tried to demonstrate the benefits of using CFturbo for turbomachinery design. Thank you for watching.