PROFILE
Name: Lakshmi
Narayana Y.
Designation: Design Engineer
Qualification: M.Tech
M.Tech.
Project (2003):
"STRESS AND VIBRATION STUDIES OF AN AERO-ENGINE COMPRESSOR
DISC”
Synopsis:
Compressor unit, located in the fore front
forms one of the vital systems of an aero-engine. It generally consists of two
stages: (1) Low Pressure Compressor (LPC) Unit and (2) High Pressure Compressor
(HPC) Unit each independently consisting of several stages. The first stage of
LPC is called fan assembly which consists of a set of blades mounted on a disc.
On the front side, the disc carries a bullet-nose. Being situated in the
fore-front, the fan assembly is occasionally prone to bird hit. This renders the
design of it more challenging as the assembly is required to contain the damage
and revive its performance after the impact.
The design and
development process of fan assembly consists of two phases:
(1) Aerodynamic design and (2) Mechanical
design.
1. Aerodynamic
Design: Based on the
aerodynamic performance requirements the principal disc dimensions namely bore,
rim diameters and axial widths are computed.
2.
3. Mechanical Design: The parameters considered in the
mechanical design consist of: (a) the
number of blades and their weight, (b) the blade root geometry, (c) the rotor
speed and (d) the operating temperature.
The design analysis and validation of
compressor disc includes: stress calculations, vibration studies, heat transfer
analysis, optimization and lifing. Over-speed analysis, burst speed estimations
also forms part of design validation.
The objective of the present work is to
carry out stress and vibration characteristics of a fan disc considering the
mechanical and thermal loads. The mechanical load consists of two parts:
1. Centrifugal force due to rotor speed,
and
2. Blade centrifugal forces.
The stress and vibration analysis are carried out using
Finite Element Method. The front-end commercial software ANSYS (Ver: 5.4) [7]
is adopted in this study. The working stresses as well as stress distributions
are checked for safety on the basis of static failure considerations using Von
Mises stress theory. The vibration analysis includes the evaluation of natural
frequencies and mode shapes.
Some important results of the
research investigations:
Education:
1. M.Tech. (Machine design)
from
University, Visveswaraiah Technological
University, Belgaum.590008
2.
B.E. (Mechanical) from
NMAMIT, Nitte,
Contact Details:
Y.Lakshmi Narayana, #2988/16, 13th
A
Vijay Nagar,
E-Mail: l_narayana_y@yahoo.com
Phone : 080-23391336(R)
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