Effect of viscosity on fuel leakage between lapped plungers and sleeves and on the discharge from a pump-injection system

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Description

Test data and analysis show that the rate of fuel leakage between a lapped plunger and sleeve varies directly with the density of the fuel, the diameter of the plunger, the pressure producing the leakage, and the cube of the mean clearance between the plunger and sleeve. The rate varies inversely as the length of the lapped fit and the viscosity of the fuel. With a mean clearance between the plunger and sleeve of 0.0001 inch the leakage amounts to approximately 0.2 percent of the fuel injected with gasoline and as low as 0.01 percent with diesel fuel oils. With ... continued below

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Rothrock, A. M. & Marsh, E. T. January 1, 1935.

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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 142 times . More information about this report can be viewed below.

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  • Main Title: Effect of viscosity on fuel leakage between lapped plungers and sleeves and on the discharge from a pump-injection system
  • Series Title: NACA Technical Reports

Description

Test data and analysis show that the rate of fuel leakage between a lapped plunger and sleeve varies directly with the density of the fuel, the diameter of the plunger, the pressure producing the leakage, and the cube of the mean clearance between the plunger and sleeve. The rate varies inversely as the length of the lapped fit and the viscosity of the fuel. With a mean clearance between the plunger and sleeve of 0.0001 inch the leakage amounts to approximately 0.2 percent of the fuel injected with gasoline and as low as 0.01 percent with diesel fuel oils. With this mean clearance an effective seal is obtained when the length of the lap is three times the diameter of the lap. The deformation of the sleeve and plunger under pressure is sufficient to change the rate of leakage appreciably from that which would be obtained if the clearance was constant under pressure.

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  • Accession or Local Control No: 93R20841
  • URL: http://hdl.handle.net/2060/19930091551 External Link
  • Report No.: NACA-TR-477
  • Center for AeroSpace Information Number: 19930091551
  • Archival Resource Key: ark:/67531/metadc66134

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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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Creation Date

  • January 1, 1935

Added to The UNT Digital Library

  • Nov. 17, 2011, 10:13 p.m.

Description Last Updated

  • March 27, 2018, 2:22 p.m.

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Rothrock, A. M. & Marsh, E. T. Effect of viscosity on fuel leakage between lapped plungers and sleeves and on the discharge from a pump-injection system, report, January 1, 1935; (digital.library.unt.edu/ark:/67531/metadc66134/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.