RMS energy conversion

• US 5,892,293 A
• Filed: 01/15/1997
• Issued: 04/06/1999
• Est. Priority Date: 01/15/1997
• Status: Expired due to Fees

• Current Assignee: Macrosonix Corp.
• Original Assignee: Macrosonix Corp.
• Inventors: Lucas, Timothy S.
• Primary Examiner(s): Dougherty, Thomas M.
• Assistant Examiner(s): Ponomarenko, Nicholas
• Application Number:
  US08/783,701
• Time in Patent Office: 811 Days
• Field of Search: 290/1 R, 290/1 A, 290/2, 322/3, 431/1, 60/39.76, 62/498
• US Class Current: 290/1.00R
• CPC Class Codes: F23C 15/00 Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass for generating combustion products of high pressure or high velocity F23R7/00; starting devices F23D11/42
• CPC Class Codes: H02P 9/04 Control effected upon non-electric prime mover and dependent upon electric output value of the generator

Abstract

An energy conversion device comprises an acoustic resonator, a pulse combustion device for creating a standing wave within said resonator, and an electric alternator. The alternator is coupled to the resonator to convert acoustically driven mechanical vibrations into electrical power.

Claims

1. An energy conversion device comprising:

a) an acoustic resonator,

b) pulse combustion means for creating a standing wave within said resonator,

c) an electric alternator,

d) said alternator being coupled to said resonator so as to convert acoustically driven mechanical vibrations into electrical power.

2. An energy conversion device as recited in claim 1 wherein said pulse combustion means comprises at least one inlet for feeding reactants into said resonator, and an outlet for providing exhaust gas to escape from said resonator.

3. An energy conversion device as recited in claim 2 wherein said pulse combustion means further comprises a means for igniting said fuel.

4. An energy conversion device as recited in claim 3 wherein said means for igniting comprises an ignition device to provide a spark to a region within said resonator, said region containing said fuel.

5. An energy conversion device as recited in claim 1, further comprising a piston coupled to said resonator, said piston driven for mechanical movement by dynamic pressure of said standing wave, said piston coupled to said alternator.

6. An energy conversion device as recited in claim 1 wherein said alternator is attached to said resonator and movement of said resonator causes movement of at least a part of said alternator.

7. An energy conversion device as recited in claim 6 wherein said alternator comprises an armature and a stator, wherein said at least one part comprises said armature mounted for relative movement with respect to said stator.

8. An energy conversion device as recited in claim 7 wherein said armature is rigidly connected to said resonator and said armature is resiliently connected to said stator.

9. An energy conversion device as recited in claim 8 wherein said resonator has a cylindrical axis and said resonator is supported for permitting facile movement along the cylindrical axis of said resonator.

10. An energy conversion device as recited in claim 7 wherein said armature is resiliently connected to said resonator and said armature is resiliently connected to said stator.

11. An energy conversion device as recited in claim 1 wherein said resonator has a cylindrical axis and said resonator is supported for permitting facile movement along the cylindrical axis of said resonator, whereby said entire resonator oscillates in response to standing waves created by said pulse combustion means.

12. An energy conversion device as recited in claim 2 further comprising a conduit positioned in thermal contact with said acoustic resonator, at least one constituent of said reactants passing through said conduit for pre-heating said at least one constituent prior to feeding said at least one constituent into said acoustic resonator.

13. An energy conversion device as recited in claim 2 further comprising a resonant plenum mounted to said acoustic resonator for pre-compressing at least one constituent of said reactants prior to feeding said at least one constituent into said acoustic resonator.

14. An energy conversion device as recited in claim 12 further comprising a resonant plenum mounted to said acoustic resonator for pre-compressing at least one constituent of said reactants prior to feeding said at least one constituent into said acoustic resonator.

15. An energy conversion device as recited in claim 12 wherein said resonator has a cylindrical axis and said resonator is supported for permitting facile movement along the cylindrical axis of said resonator, whereby said entire resonator oscillates in response to standing waves created by said pulse combustion means.

16. An energy conversion device as recited in claim 13 wherein said resonator has a cylindrical axis and said resonator is supported for permitting facile movement along the cylindrical axis of said resonator, whereby said entire resonator oscillates in response to standing waves created by said pulse combustion means.

17. An energy conversion device as recited in claim 16 wherein said resonant plenum is configured to have approximately the same resonant frequency as said acoustic resonator.

18. An energy conversion device as recited in claim 2 wherein said exhaust gases are coupled to a device to perform useful work.

19. An energy conversion device as recited in claim 2 wherein said exhaust gases are thermally coupled to a thermoacoustic energy conversion device, said thermoacoustic energy conversion device comprising:

(a) an acoustic resonator,

(b) thermoacoustic means for creating a standing wave within said resonator, said thermoacoustic means including a heat exchanger thermally coupled to receive heat from said exhaust gases,

(c) an electric alternator, and

(d) said alternator being attached to said resonator so as to convert acoustically driven mechanical vibrations of said resonator into electrical power.

20. An energy conversion device as recited in claim 2 further comprising:

a) a resonant plenum mounted to said resonator,

b) said at least one inlet communicating between said resonant plenum and said resonator,

c) a resonant plenum inlet for feeding at least one constituent of said reactants into said resonant plenum,

d) said resonant plenum having a standing wave therein whereby said at least one constituent of said reactants is acoustically compressed prior to entering said resonator.

21. An energy conversion device as recited in claim 2 further comprising:

a) a conduit positioned in thermal contact with said acoustic resonator, at least one of first and second constituents of said reactants passing through said conduit for pre-heating said at least one of said first and second constituents prior to feeding said at least one of said first and second constituents into said acoustic resonator,

b) a resonant plenum mounted to said resonator,

c) said at least one inlet communicating between said resonant plenum and said resonator,

d) a resonant plenum inlet for feeding at least one of said first and second constituents into said resonant plenum,

e) said resonant plenum having a standing wave therein whereby said at least one of said first and second constituents fed into said resonant plenum is acoustically compressed prior to entering said resonator.

22. An energy conversion device comprising:

a) an acoustic resonator,

b) means for creating a standing wave within said resonator, said means for creating including means for introducing and igniting reactants within said resonator to produce pulse combustion,

c) said resonator having a cylindrical axis and mounted for vibratory movement along said cylindrical axis, wherein said standing waves from said pulse combustion drive the vibratory movement of said resonator,

d) an electric alternator having an armature and a stator, said armature and stator mounted for relative movement with respect to one another, and

e) said armature being attached to said resonator so as to convert acoustically driven mechanical vibrations of said resonator into movement of said armature and thus into electrical power.

23. An energy conversion device comprising:

a) an acoustic resonator,

b) thermoacoustic means for creating a standing wave within said resonator,

c) an electric alternator,

d) said alternator being attached to said resonator so as to convert acoustically driven mechanical vibrations of said resonator into electrical power, and

e) wherein said resonator has a cylindrical axis and said resonator is supported for permitting facile movement along the cylindrical axis of said resonator, whereby said entire resonator oscillates in response to standing waves created by said thermoacoustic means.

24. An energy conversion device as recited in claim 23 wherein said alternator comprises an armature and a stator, said armature mounted for relative movement with respect to said stator.

25. An energy conversion device as recited in claim 24 wherein said armature is rigidly connected to said resonator and said armature is resiliently connected to said stator.

26. An energy conversion device as recited in claim 24 wherein said armature is resiliently connected to said resonator and said armature is resiliently connected to said stator.

27. An energy conversion device comprising:

a) an acoustic resonator,

b) thermoacoustic means for creating a standing wave within said resonator,

c) said resonator having a cylindrical axis and mounted for vibratory movement along said cylindrical axis, wherein said standing waves drive the vibratory movement of said resonator,

d) an electric alternator having an armature and a stator, said armature and stator mounted for relative movement with respect to one another, and

e) said armature being attached to said resonator so as to convert acoustically driven mechanical vibrations of said resonator into movement of said armature and thus into electrical power.

28. An energy conversion device comprising:

a) an acoustic resonator,

b) one of (1) pulse combustion means and (2) thermoacoustic means for creating a standing wave within said resonator,

c) an electric alternator,

d) said alternator being coupled to said resonator so as to convert acoustically driven mechanical vibrations into electrical power

e) said resonator having a chamber containing a fluid, said chamber being driven at a resonant mode and having means, including at least an internal wall configuration of said chamber, which provide the harmonic phases and amplitudes such as to synthesize a non-sinusoidal, unshocked waveform.

29. An energy conversion device comprising:

a) an acoustic resonator having a cylindrical axis defined as a z axis and a radius r being defined as the perpendicular distance from an inner surface of said resonator to said z axis,

b) one of (1) pulse combustion means and (2) thermoacoustic means for creating a standing wave within said resonator,

c) an electric alternator,

d) said alternator being coupled to said resonator so as to convert acoustically driven mechanical vibrations into electrical power,

e) said resonator having an interior shape such that dr/dz is zero near a pressure node of the peak pressure distribution along said z axis.