Title

Approximation Of Critical Speeds For Shafts With Thermal Gradients Using A Rotating Heat Rig

Abstract

The simulation of internal airflow within turbine blade cooling channels can be useful in understanding the interactions between the operating temperatures, the coolant flow and its effectiveness, and the angular velocity of the blade. A rotating heat rig was designed as a meso-scale testing device to help understand these relationships within the confines of a lab. The first phase of the device was the use of a tubular shaft specimen which was mounted in series with the axis of rotation of the rig. The pipe was externally heated with the use of NiCr resistive wire to simulate the operating temperatures of a turbine blade. The heating element and the rotation of the sample were controlled digitally. Important design considerations were made such as accurate temperature control, modal changes as a function of varying temperature, and accurate bearing life estimates. As a part of carrying out this research, it was determined that none of the analytical models from literature were capable of predicting the critical speed of a shaft with non-uniform temperature distribution. Models based on Rayleigh's method, Dunkerley's method, and finite element analysis were created to estimate the critical speeds of the device. The analytical model that was developed makes up for the short comings of existing approaches. Copyright © 2010 by ASME.

Publication Date

12-1-2010

Publication Title

Proceedings of the ASME Turbo Expo

Volume

6

Issue

PARTS A AND B

Number of Pages

147-155

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1115/GT2010-22522

Socpus ID

82055202031 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/82055202031

This document is currently not available here.

Share

COinS