International Journal of Mechanics and Solids
  • Year: 2009
  • Volume: 4
  • Issue: 1

Convective Heat Transfer Analysis of a Aero Gas Turbine Blade Using Ansys

  • Author:
  • S. Gowreesh1, N. Sreenivasalu Reddy2, N.V. Yogananda Murthy3
  • Total Page Count: 8
  • Page Number: 39 to 46

1Infotech Enterprises, Plot # 2, IT Park, Nanakramguda, Manikonda, Hyderabad.

2S R S I T, Bangalore, Kanchiraya S, Senior Lecturer, K I T, Tiptur.

3Sri Krishna Institute of Technology, Bangalore.

NomenclatureSYMBOL

DISCRIPTION

P

Load

Fa

Axial force

Fc

Centrifugal force

Ft

Tangential force

α

Coefficient of thermal expansion

Mz

Moment Load

E

Young's Modulus

I

Moment Of Inertia

U

Internal strain Energy

W

External work done

Ux

Displacement along X-direction

Uy

Displacement along Y-direction

δ

Deflection

μ

Poisson's ratio

σ

Stress

[K]

Stiffness matrix

B

Strain Displacement matrix

Q

Nodal displacement

F

Shape Function

L

Length

D

Diameter of shaft

Mb, Mt

Bending, Twisting Moment

N

RPM of turbine

E

strain

T

Torque transmitted by shaft

C1

approach Velocity

C2

theoretical exit velocity

A1

absolute air velocity

Cb

Blade speed

Cw

tangential component

At

Area of throat

Dt

Diameter of throat

1,2

suffix for inlet, outlet conditions

P

Power developed

K

Thermal conductivity

h

Convective heat transfer coefficient

M

total mass of rotor blade

ρ

density of gases

Re

Reynolds Number

Nu

Nusselt number

Pr

Prandtl number

Abstract

In the present work the first stage rotor blade of a two stage gas turbine has been analyzed for structural, thermal, modal analysis using ANSYS 9.0.which is a powerful Finite Element Method[1–3] Software. The temperature distribution in the rotor blade has been evaluated using this software.

The design features of the turbine segment of the gas turbine have been taken from the preliminary design of a power turbine for maximization of an existing turbojet engine [8]. It was observed that in the above design, the rotor blades after being designed were analyzed only for the mechanical stresses but no evaluation of thermal stress was carried out. As the temperature has a significant effect on the overall stress on the rotor blades, it has been felt that a detail study can be carried out on the temperature effects to have a clear understanding of the combined mechanical and thermal stresses.