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Title: Pulse combustor with controllable oscillations

Abstract

A pulse combustor having thermally induced pulse combustion in a continuously flowing system is described. The pulse combustor is fitted with at lease one elongated ceramic body which significantly increases the heat transfer area in the combustion chamber of the combustor. The ceramic body or bodies possess sufficient mass and heat capacity to ignite the fuel-air charge once the ceramic body or bodies are heated by conventional spark plug initiated combustion so as to provide repetitive ignition and combustion of sequentially introduced fuel-air charges without the assistance of the spark plug and the rapid quenching of the flame after each ignition in a controlled manner so as to provide a selective control over the oscillation frequency and amplitude. Additional control over the heat transfer in the combustion chamber is provided by employing heat exchange mechanisms for selectively heating or cooling the elongated ceramic body or bodies and/or the walls of the combustion chamber.

Inventors:
 [1];  [2];  [1]
  1. (Morgantown, WV)
  2. (Columbiana, OH)
Publication Date:
Research Org.:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
OSTI Identifier:
868354
Patent Number(s):
US 5123835
Assignee:
United States of America as represented by United States (Washington, DC) NETL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
pulse; combustor; controllable; oscillations; thermally; induced; combustion; continuously; flowing; described; fitted; lease; elongated; ceramic; significantly; increases; heat; transfer; chamber; bodies; possess; sufficient; mass; capacity; ignite; fuel-air; charge; heated; conventional; spark; plug; initiated; provide; repetitive; ignition; sequentially; introduced; charges; assistance; rapid; quenching; flame; controlled; manner; selective; control; oscillation; frequency; amplitude; additional; provided; employing; exchange; mechanisms; selectively; heating; cooling; walls; significantly increases; heat capacity; oscillation frequency; thermally induced; spark plug; combustion chamber; heat exchange; heat transfer; controlled manner; pulse combustor; sufficient mass; additional control; rapid quenching; continuously flowing; rapid quench; pulse combustion; employing heat; significantly increase; /431/60/122/

Citation Formats

Richards, George A., Welter, Michael J., and Morris, Gary J.. Pulse combustor with controllable oscillations. United States: N. p., 1992. Web.
Richards, George A., Welter, Michael J., & Morris, Gary J.. Pulse combustor with controllable oscillations. United States.
Richards, George A., Welter, Michael J., and Morris, Gary J.. 1992. "Pulse combustor with controllable oscillations". United States. doi:. https://www.osti.gov/servlets/purl/868354.
@article{osti_868354,
title = {Pulse combustor with controllable oscillations},
author = {Richards, George A. and Welter, Michael J. and Morris, Gary J.},
abstractNote = {A pulse combustor having thermally induced pulse combustion in a continuously flowing system is described. The pulse combustor is fitted with at lease one elongated ceramic body which significantly increases the heat transfer area in the combustion chamber of the combustor. The ceramic body or bodies possess sufficient mass and heat capacity to ignite the fuel-air charge once the ceramic body or bodies are heated by conventional spark plug initiated combustion so as to provide repetitive ignition and combustion of sequentially introduced fuel-air charges without the assistance of the spark plug and the rapid quenching of the flame after each ignition in a controlled manner so as to provide a selective control over the oscillation frequency and amplitude. Additional control over the heat transfer in the combustion chamber is provided by employing heat exchange mechanisms for selectively heating or cooling the elongated ceramic body or bodies and/or the walls of the combustion chamber.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1992,
month = 1
}

Patent:

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  • This patent describes a pulse combustor for providing oscillating pulses of combustion gases at selected frequencies and amplitudes. It comprises combination longitudinally extending housing means having side walls and opposite end wall portions defining a combustion chamber therein, discharge means coupled to one end wall portion of the housing means and disposed in registry with the combustion chamber through an opening in the one end wall portion, fuel inlet means and air inlet means coupled to the housing means and in registry with the combustion chamber for cyclicly charging the combustion chamber with charges of fuel and air at preselectedmore » equivalence ratios and flow times, ignition means carried by the housing means for sequentially igniting the cyclic charges of fuel and air for providing oscillating uses of combustion gases through the discharge means.« less
  • A pulse combustor having thermally induced pulse combustion in a continuously flowing system is described. The pulse combustor is fitted with at lease one elongated ceramic body which significantly increases the heat transfer area in the combustion chamber of the combustor. The ceramic body or bodies possess sufficient mass and heat capacity to ignite the fuel-air charge once the ceramic body or bodies are heated by conventional spark plug initiated combustion so as to provide repetitive ignition and combustion of sequentially introduced fuel-air charges without the assistance of the spark plug and the rapid quenching of the flame after eachmore » ignition in a controlled manner so as to provide a selective control over the oscillation frequency and amplitude. Additional control over the heat transfer in the combustion chamber is provided by employing heat exchange mechanisms for selectively heating or cooling the elongated ceramic body or bodies and/or the walls of the combustion chamber.« less
  • A pulse combustor apparatus adapted to burn either a liquid fuel or a pulverized solid fuel within a preselected volume of the combustion chamber. The combustion process is substantially restricted to an optimum combustion zone in order to attain effective pulse combustion operation.
  • This patent describes a pulse combustion. It comprises: at least one mixing and ignition chamber wall forming a mixing and ignition chamber, fuel inlet means, air inlet means. The mixing and ignition chamber in communication with the fuel inlet means and the air inlet means, fuel being introduced through the fuel inlet means and combustion air being introduced through the air inlet means forming a combustible fuel/air mixture in the mixing and ignition chamber, ignition means for igniting the combustible fuel/air mixture; at least one combustion chamber wall forming a combustion chamber; and a plurality of exhaust tubes. Also describedmore » is an improved pulse combustor of the type having a mixing chamber, ignition chamber, fuel inlet means and air inlet means. The improvement comprises: the combustion chamber having a plurality of downstream combustion chamber branches, the combustion chamber branches having a slot between at least one combustion chamber branch wall of each the combustion chamber branch, and a plurality of exhaust tubes having on end in communication with the combustion chamber branches.« less
  • This patent describes a pulse jet combustor apparatus for the drying of particulate material of the type having a combustion chamber, an air inlet conduit connected to one end thereof, a primary exhaust gas outlet outlet conduit connected to the other end thereof, an elongated transition-tailpipe section connected to the primary exhaust conduits and a frusto-conically shaped drying section of increasing diameter connected to the downstream end of the transition-tailpipe section having means for introducing particulate materials to be dried therein. The improvement described here is wherein the drying cone includes longitudinally spaced diminuitive concentric rings mounted on the innermore » surface thereof to sequentially create selectively located perimetric turbulence in the portions of primary exhaust gas stream disposed adjacent the inner surface of the drying cone as it flows therepast.« less