Turbine heating with TBR

am_chel · March 31, 2025, 11:00

Hello.

I have the task of simulating the heating process of a single-stage turbine, that includes stator, rotor and a solid body of the rotor.

The initial state of a solid body is a uniform temperature of 20°C. During first 10 seconds the rotational speed, pressure and temperature at the turbine inlet are increasing, and after that remain constant (high). I need to calculate about 600 seconds until the solid body reaches a steady temperature state.

Is it possible to perform such a calculation using transient blade row model (with sector modeling approach) or it is necessary to perform a "true" transient calculation with full annulus of rows?

Opaque · March 31, 2025, 11:53

What is the exact goal of the simulation?

Unless you are looking for thermal wave interactions affecting phase lag concerning other variables, you can get away with a single passage per row and run a transient.

How familiar are you with modeling rotor-stator interactions?

am_chel · March 31, 2025, 13:51

Dear Opaque, thank you for the answer.

The exact goal of the simulation is to simulate turbine heating from "cold" state during turbocharger start procedure. And a look for thermal wave interactions is not a goal of the simulation.

My experience is mainly connected with steady turbomachinery simulations. As I thought, to run a transient calculation, the full circumference of the turbomachine is required, except in cases where pitch-change methods such as PT, TT or FT are used. And again, as I thought, the solution with these methods converges to a "steady-periodic" state, but I need to simulate transient process with, for example, turbine rotational velocity change in time, which makes process not "steady-periodic".

But from your answer I see that I can get away with a single passage per row and just run a transient. This is a new information for me.

March 31, 2025, 11:00	Turbine heating with TBR	#1
am_chel New Member Join Date: Mar 2025 Posts: 2 Rep Power: 0	Hello. I have the task of simulating the heating process of a single-stage turbine, that includes stator, rotor and a solid body of the rotor. The initial state of a solid body is a uniform temperature of 20°C. During first 10 seconds the rotational speed, pressure and temperature at the turbine inlet are increasing, and after that remain constant (high). I need to calculate about 600 seconds until the solid body reaches a steady temperature state. Is it possible to perform such a calculation using transient blade row model (with sector modeling approach) or it is necessary to perform a "true" transient calculation with full annulus of rows?

March 31, 2025, 11:53		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,903 Rep Power: 33	What is the exact goal of the simulation? Unless you are looking for thermal wave interactions affecting phase lag concerning other variables, you can get away with a single passage per row and run a transient. How familiar are you with modeling rotor-stator interactions? __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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March 31, 2025, 13:51		#3
am_chel New Member Join Date: Mar 2025 Posts: 2 Rep Power: 0	Dear Opaque, thank you for the answer. The exact goal of the simulation is to simulate turbine heating from "cold" state during turbocharger start procedure. And a look for thermal wave interactions is not a goal of the simulation. My experience is mainly connected with steady turbomachinery simulations. As I thought, to run a transient calculation, the full circumference of the turbomachine is required, except in cases where pitch-change methods such as PT, TT or FT are used. And again, as I thought, the solution with these methods converges to a "steady-periodic" state, but I need to simulate transient process with, for example, turbine rotational velocity change in time, which makes process not "steady-periodic". But from your answer I see that I can get away with a single passage per row and just run a transient. This is a new information for me.