A new type of internal combustion engine and its thermodynamic cycle are introduced. The core of the engine is a nutating nonrotating disk, with the center of its hub mounted in the middle of a Z-shaped shaft. The two ends of the shaft rotate, while the disk nutates. The motion of the disk circumference prescribes a portion of a sphere. A portion of the area of the disk is used for intake and compression, a portion is used to seal against a center casing, and the remaining portion is used for expansion and exhaust. The compressed air is admitted to an external accumulator, and then into an external combustion chamber before it is admitted to the power side of the disk. The accumulator and combustion chamber are kept at constant pressures. The engine has a few analogies with piston-engine operation, but like a gas turbine it has dedicated spaces and devices for compression, burning, and expansion. The thermal efficiency is similar to that of comparably sized simple-cycle gas turbines and piston engines. For the same engine volume and weight, this engine produces less specific power than a simple-cycle gas turbine, but approximately twice the power of a two-stroke engine and four times the power of a four-stroke engine. The engine has advantages in the 10 kW to 200 kW power range. This paper introduces the geometry and thermodynamic model for the engine, presents typical performance curves, and discusses the relative advantages of this engine over its competitors.

Issue Section:
Gas Turbines: Cycle Innovations
Keywords:
internal combustion engines, thermodynamics, combustion, seals (stoppers)
Topics:
Disks, Engines, Piston engines, Gas turbines, Compression, Cycles, Combustion, Pressure
1.
Patten, J., 1882, Rotary engine. US patent no. 263,573.
2.
Roseland, T. C., 1905, Rotary engine. US patent no. 790,264.
3.
Wicha, A., 1935, Gas and vapor compressor. US patent no. 1,986,454.
4.
Cohen, W. A., 1937, Rotary engine. US patent no. 2,069,646.
5.
Nasvytis, A. L., 1961, Nutating disk motor. US patent 2,992,635.
6.
Day, D. B., and Koerner, W. J., 1963, Nutating disk internal combustion engine. US patent no. 3,102,517.
7.
Kreimeyer, H., 1970, Rotary nutating power device. US patent no. 3,492,974.
8.
Van Meegen, H. A. B, 1974, An improved motor, pump or the like. Australian patent no. 67,511.
9.
Wahl, R. H., 1975, Rotary nutating engine. US patent no. 3,895,610.
10.
Wahl, R. H., 1976, Nutating engine. US patent no. 3,981,639.
11.
Parker, 1982, Swashplate machines, US patent no. 3,942,384.
12.
Ziegler, M., 1982, Die Erfindung betrifft einen Rotationskolbenverbrennungsmotor insbesondere fur den Automobilbau. German patent no. 3,942,384.
13.
Kim, J. D., 1992, Rotary wavy motion type engine. US patent no. 5,138,993.
14.
Clarke
,
J. M.
,
Walker
,
D. F.
, and
Hamilton
,
P. H.
,
1972
, “
A New Class of Rotary Piston Machine Suitable for Compressors, Pumps and Internal Combustion Engines
,”
Proc. Inst. Mech. Eng.
,
186
(
62/72
62/72
).
15.
Meyer, L., 1993, Nutating internal combustion engine. US patent no. 5,251,594.
16.
Korakianitis
,
T.
, and
Sadoi
,
T.
,
1997
, “
Turbocharger-Design Effects on Gasoline-Engine Performance
,” ASME J. Eng. Gas Turbines Power, accepted for publication.
17.
Wilson, D. G., and Korakianitis, T., 1998, The Design of High-Efficiency Turbomachinery and Gas Turbines, 2nd Ed., Prentice-Hall, Englewood Cliffs, NJ.
18.
Korakianitis
,
T.
, and
Wilson
,
D. G.
,
1994
, “
Models for Predicting the Performance of Brayton-Cycle Engines
,”
ASME J. Eng. Gas Turbines Power
,
116
, pp.
381
–
388
.
Copyright © 2004
 by ASME
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