Numerical investigation of the aerodynamic characteristics of a coupling of the three blades VAWT with a movable vanes

In order to keep a high efficiency of a gas turbine, it is important to make a suitable maintenance. Gas turbine nozzle guide vanes (NGVs) and turbine rotor blades deteriorate through a long-time operation due to various causes such as a particle attachment, erosion, and a thermal stress. In the present study, a numerical investigation has been carried out to clarify the influence of the NGV and the rotor blade deterioration on aerodynamics in a 3-stage gas turbine. Geometries of the NGV and the rotor blade were measured from a real gas turbine using a 3-D scanner. The first stage NGVs and rotor blades usually deteriorate seriously and are usually replaced at certain intervals. Two kinds of the geometries of the NGV and the rotor blade of the first stage were obtained, which are the new ones before use and the used ones to be replaced. For the second stage and the third stage, the geometries before use were used in the computations. The numerical results show that the isentropic efficiency of the first stage increases and that of the second stage decrease due to the deterioration of the first stage. The efficiency of the third stage is not affected significantly. The mechanisms are discussed from the observation of the flow fields.

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A numerical investigation into the aerodynamic characteristics and aeroelastic stability of a footbridge

Journal of Fluids and Structures ◽

10.1016/j.jfluidstructs.2008.05.001 ◽

2009 ◽

Vol 25 (1) ◽

pp. 155-177 ◽

Cited By ~ 19

Author(s):

I.J. Taylor ◽

M. Vezza

Keyword(s):

Numerical Investigation ◽

Aerodynamic Characteristics ◽

Aeroelastic Stability

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NUMERICAL INVESTIGATION OF A TONE NOISE OF THE FAN WITH CASING TREATMENT

Perm National Research Polytechnic University Aerospace Engineering Bulletin ◽

10.15593/2224-9982/2021.66.03 ◽

2021 ◽

pp. 24-38

Author(s):

Yaroslav Druzhinin ◽

◽

Viktor Mileshin ◽

Anton Rossikhin ◽

◽

...

Keyword(s):

Flow Field ◽

Unsteady Flow ◽

Numerical Investigation ◽

Significant Influence ◽

Aerodynamic Characteristics ◽

Operational Conditions ◽

Casing Treatment ◽

Harmonic Method ◽

Surge Line ◽

Bypass Ratio

Numerical investigation of influence of a slot-type casing treatment on acoustic and aerodynamic characteristics of the fan of ultra-high bypass ratio turbofan is presented. The investigation was performed using NUMECA FINE/Turbo solver. NLH harmonic method was used to simulate the effect of casing treatment on unsteady flow field in the turbomachine. Two operational conditions were investigated – “sideline” and “approach”. The attention for the first operational condition was paid for aerodynamic characteristics. Significant influence of casing treatment on them was found especially near the surge line. At the “approach” operational conditions the attention was paid for the proper calculation of tone noise. It was shown that the installation of casing treatment leads to decrease of power of tone noise radiated through the inlet. However the power of the tone noise, radiated through the nozzle, and also the overall power of tone noise increase.

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