A two-dimensional model for a trochoidal-type machine without apex seals using finite element method has been developed with the help of Cosmos/M V1.65, and is evaluated by using a classical free-body technique. The minimum running clearance required to avoid contact between rotor and chamber is determined by an iterative procedure using the finite element model. The variation in the minimum required running clearance with the variation in the design parameters is studied. Guidelines for using the results of this study for an optimal design of a trochoidal-type machine without apex seals are presented.

1.
Colbourne, J. R., 1974, “The Geometry of Trochoid Envelopes and Their Application in Rotary Pumps,” Mechanism and Machine Theory, Pergamon Press Ltd, Oxford, England, Vol. 9, pp. 421–435.
2.
COSMOS/M, 1992, “User Guide V1.65,” Structural Research and Analysis Corporation, Santa Monica, CA, October.
3.
Hoffmann, R. M., 1985, “Volumetric Trochoidal Gas Compressor for Use as a Heat Pump,” Trochoid Power Corporation, Report to GRI, 85/0026, Chicago, Illinois.
4.
Li, S., and Shung, J. B., 1994, “The Study of Geometry and Pressure in the Trochoidal-Type Machine without Apex Seal,” Proceedings of 1994 International Compressor Conference at Purdue, W. Lafayette, Indiana, pp. 293–298, July 19–22.
5.
Robinson
F. J.
, and
Lyon
J. R.
,
1976
, “
An Analysis of Epitrochoidal Profiles with Constant Difference Modification Suitable for Rotary Expanders and Pumps
,”
ASME Journal of Engineering for Industry
, Vol.
98
, Series B, No.
1
pp.
161
165
, February.
6.
Shung, J. B., and Pennock, G. R., 1993, “The Direct Contact Problem in a Trochoidal-Type Machine,” Proceedings, Advances in Design Automation, ASME Design Technical Conference, Albuquerque, NM, DE-Vol. 65-1, pp. 675–685, Sept. 19-22.
7.
Shung, J. B., and Pennock, G. R., 1994, “Geometry of Trochoidal-Type Machines with Conjugate Envelopes,” Mechanism and Machine Theory, Pergamon Press Ltd., Oxford, England, Vol. 29, No. 1, pp. 25–42.
8.
Shung, J. B., and Zhang, Y., 1995, “Kinematic Analysis on Running Clearance in A Trochoidal-Type Machine,” 21st ASME Design Automation Conference, Boston, MA, September 17–20.
9.
Venkatesh, K., 1994, “Finite Element Analysis and Design of a Trochoidal-Type Machine Without Apex Seals,” M.S. Thesis, Louisiana Technical University, November.
This content is only available via PDF.
You do not currently have access to this content.