Discussion: “The Lomakin Effect in Annular Gas Seals Under Choked Flow Conditions” (Arghir, M., Defaye, C., and Frêne, F., 2007, ASME J. Eng. Gas Turbines Power, 129 , pp. 1028–1034) PUBLIC ACCESS

[+] Author and Article Information
Dara Childs

Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843

J. Eng. Gas Turbines Power 129(4), 1143 (Jan 05, 2007) (1 page) doi:10.1115/1.2718218 History: Received January 03, 2007; Revised January 05, 2007

The authors’ predictions that choked flow in an annular gas seal is likely to produce negative direct stiffness was recently borne out in tests conducted by the discussers. A smooth seal was tested in air with supply pressure 18.3bar and discharge near atmospheric pressure. The seal has dimensions: L=100mm, D=100mm, and radial clearance Cr=0.305mm. The measured direct static stiffness is negative, K=1.93MNm. The model available to the discussers is based on the work of Kleynhans and Childs (1) and would not converge at the full pressure differential. The direct stiffness predicted by this model becomes negative and its magnitude increases as the input supply pressure increases from 10bars, but the code stops converging above a δP of 13bars. What do the authors predict for this seal and the test conditions provided above? Additional test results are available for the seal in (2).


Copyright © 2007 by American Society of Mechanical Engineers
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