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Fuel Spray and Flame Formation in a Compression-Ignition Engine Employing Air FlowThe effects of air flow on fuel spray and flame formation in a high-speed compression-ignition engine have been investigated by means of the NACA combustion apparatus. The process was studied by examining high-speed motion pictures taken at the rate of 2,200 frames a second. The combustion chamber was of the flat-disk type used in previous experiments with this apparatus. The air flow was produced by a rectangular displacer mounted on top of the engine piston. Three fuel-injection nozzles were tested: a 0.020-inch single-orifice nozzle, a 6-orifice nozzle, and a slit nozzle. The air velocity within the combustion chamber was estimated to reach a value of 425 feet a second. The results show that in no case was the form of the fuel spray completely destroyed by the air jet although in some cases the direction of the spray was changed and the spray envelope was carried away by the moving air. The distribution of the fuel in the combustion chamber of a compression-ignition engine can be regulated to some extent by the design of the combustion chamber, by the design of the fuel-injection nozzle, and by the use of air flow.
Document ID
19930091664
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Rothrock, A M
Waldron, C D
Date Acquired
September 6, 2013
Publication Date
January 1, 1937
Report/Patent Number
NACA-TR-588
Accession Number
93R20954
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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