The Effect of Clearance Distribution on the Performance of a Compression-Ignition Engine with a Precombustion Chamber

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The clearance distribution in a precombustion chamber cylinder head was varied so that for a constant compression ratio of 13.5 the spherical auxiliary chambers contained 20, 35, 50, and 70 per cent of the total clearance volume. Each chamber was connected to the cylinder by a single circular passage, flared at both ends, and of a cross-sectional area proportional to the chamber volume, thereby giving the same calculated air-flow velocity through each passage. Results of engine-performance tests are presented with variations of power, fuel consumption, explosion pressure, rate of pressure rise, ignition lag, heat loss to the cooling water, and ... continued below

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Moore, C. S. & Collins, J. H., Jr. November 1932.

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This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and one other and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 88 times . More information about this report can be viewed below.

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  • Main Title: The Effect of Clearance Distribution on the Performance of a Compression-Ignition Engine with a Precombustion Chamber
  • Series Title: NACA Technical Notes

Description

The clearance distribution in a precombustion chamber cylinder head was varied so that for a constant compression ratio of 13.5 the spherical auxiliary chambers contained 20, 35, 50, and 70 per cent of the total clearance volume. Each chamber was connected to the cylinder by a single circular passage, flared at both ends, and of a cross-sectional area proportional to the chamber volume, thereby giving the same calculated air-flow velocity through each passage. Results of engine-performance tests are presented with variations of power, fuel consumption, explosion pressure, rate of pressure rise, ignition lag, heat loss to the cooling water, and motoring characteristics. For good performance the minimum auxiliary chamber volume, with the cylinder head design used, was 35 per cent of the total clearance volume; for larger volumes the performance improves but slightly. With the auxiliary chamber that contained 35 percent of the clearance volume there were obtained the lowest explosion pressures, medium rates of pressure rise, and slightly less than the maximum power. For all clearance distributions an increase in engine speed decreased the ignition lag in seconds and increased the rate of pressure rise.

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  • Accession or Local Control No: 93R10506
  • URL: http://hdl.handle.net/2060/19930081216 External Link
  • Report No.: NACA-TN-435
  • Center for AeroSpace Information Number: 19930081216
  • Archival Resource Key: ark:/67531/metadc54104

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National Advisory Committee for Aeronautics Collection

The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel transferred to the newly created National Aeronautics and Space Administration (NASA).

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  • November 1932

Added to The UNT Digital Library

  • Nov. 14, 2011, 7:18 p.m.

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  • March 27, 2018, 1:11 p.m.

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Moore, C. S. & Collins, J. H., Jr. The Effect of Clearance Distribution on the Performance of a Compression-Ignition Engine with a Precombustion Chamber, report, November 1932; (digital.library.unt.edu/ark:/67531/metadc54104/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.