The effects of engine speed and mixture temperature on the knocking characteristics of several fuels

One of 4,107 reports in the series: NACA Technical Notes available on this site.
Thumbnail image of item number 1 in: 'The effects of engine speed and mixture temperature on the knocking characteristics of several fuels'.
Thumbnail image of item number 2 in: 'The effects of engine speed and mixture temperature on the knocking characteristics of several fuels'.
Thumbnail image of item number 3 in: 'The effects of engine speed and mixture temperature on the knocking characteristics of several fuels'.
Thumbnail image of item number 4 in: 'The effects of engine speed and mixture temperature on the knocking characteristics of several fuels'.
Showing 1-4 of 28 pages in this report.

PDF Version Also Available for Download.

Description

Six 100-octane and two 87-octane aviation engine fuels were tested in a modified C.F.R. variable-compression engine at 1,500, 2,000 and 2,500 rpm. The mixture temperature was raised from 50 to 300 F in approximately 50 degree steps and, at each temperature, the compression ratio was adjusted to give incipient knock as shown by a cathode ray indicator. The results are presented in tabular form. The results are analyzed on the assumption that the conditions which determine whether a given fuel will knock are the maximum values of density and temperature reached by the burning gases. A maximum permissible density factor, … continued below

Physical Description

[26] p. : ill.

Creation Information

Lee, Dana W. July 1940.

Context

This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 74 times. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Author

Originator

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

About | Browse this Partner

Contact Us

Corrections Questions

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Titles

  • Main Title: The effects of engine speed and mixture temperature on the knocking characteristics of several fuels
  • Series Title: NACA Technical Notes

Description

Six 100-octane and two 87-octane aviation engine fuels were tested in a modified C.F.R. variable-compression engine at 1,500, 2,000 and 2,500 rpm. The mixture temperature was raised from 50 to 300 F in approximately 50 degree steps and, at each temperature, the compression ratio was adjusted to give incipient knock as shown by a cathode ray indicator. The results are presented in tabular form. The results are analyzed on the assumption that the conditions which determine whether a given fuel will knock are the maximum values of density and temperature reached by the burning gases. A maximum permissible density factor, proportional to the maximum density of the burning gases just prior to incipient knock, and the temperature of the burning gases at that time were computed for each of the test conditions. Values of the density factors were plotted against the corresponding end-gas temperatures for the three engine speeds and also against engine speed for several and end-gas temperatures. The maximum permissible density factor varied only slightly with engine speed but decreased rapidly with an increase in the end-gas temperature. The effect of changing the mixture temperature was different for fuels of different types. The results emphasize the desirability of determining the anti knock values of fuels over a wide range of engine and intake-air conditions rather that at a single set of conditions.

Physical Description

[26] p. : ill.

Subjects

Keywords

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Accession or Local Control No: 93R10885
  • OCLC: 1156323958
  • URL: http://digital.library.unt.edu/ark:/67531/metadc54664 External Link
  • Report No.: NACA-TN-767
  • Center for AeroSpace Information Number: 19930081595
  • Archival Resource Key: ark:/67531/metadc54664

Collections

This report is part of the following collections of related materials.

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).

About | Browse this Collection

Technical Report Archive and Image Library

The Technical Report Archive & Image Library (TRAIL) identifies, acquires, catalogs, digitizes and provides unrestricted access to U.S. government agency technical reports. The mission of TRAIL is to ensure preservation, discoverability, and persistent open access to government technical publications regardless of form or format.

About | Browse this Collection

What responsibilities do I have when using this report?

Digital Files

When

Dates and time periods associated with this report.

Creation Date

  • July 1940

Added to The UNT Digital Library

  • Nov. 14, 2011, 10:28 p.m.

Description Last Updated

  • June 4, 2020, 12:43 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 74
More Statistics

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

Thumbnail image of item number 1 in: 'The effects of engine speed and mixture temperature on the knocking characteristics of several fuels'.
Thumbnail image of item number 2 in: 'The effects of engine speed and mixture temperature on the knocking characteristics of several fuels'.
Thumbnail image of item number 3 in: 'The effects of engine speed and mixture temperature on the knocking characteristics of several fuels'.
Thumbnail image of item number 4 in: 'The effects of engine speed and mixture temperature on the knocking characteristics of several fuels'.

PDF Version Also Available for Download.

Citations, Rights, Re-Use

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Links for Robots

Helpful links in machine-readable formats.

Archival Resource Key (ARK)

International Image Interoperability Framework (IIIF)

Metadata Formats

Images

URLs

Stats

Lee, Dana W. The effects of engine speed and mixture temperature on the knocking characteristics of several fuels, report, July 1940; (https://digital.library.unt.edu/ark:/67531/metadc54664/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

Back to Top of Screen