Operating Temperatures of a Sodium-Cooled Exhaust Valve as Measured by a Thermocouple

Abstract

A thermocouple was installed in the crown of a sodium-cooled exhaust valve and tested in an air-cooled engine cylinder to determine valve temperatures under various engine operating conditions. The highest temperature of the crown of the exhaust valve was 1337 deg F at fuel/air ratio 0.064, indicated mean effective pressure, 179 lb/sq in., engine speed, 2000 rpm and spark advance, 19 deg BTC. Variation in fuel/air ratio had a relatively great effect on valve temperature, but cooling-air pressure and variation in spark advance had little effect. An increase in engine power by change of speed or mean effective pressure increased the valve temperature. It was found that the temperature of the rear-spark-plug busing was not a satisfactory indication of the temperature of the exhaust valve.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1943
Accession Number
ADA801184

Entities

People

  • B. A. Mulcahy
  • H. D. Wilstead
  • J. C. Sanders

Organizations

  • Glenn Research Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aeronautics
  • Air Cooled
  • Air Pressure
  • Combustion
  • Cooling
  • Engines
  • Exhaust Gases
  • Exhaust Valves
  • Fuel Air Ratio
  • Heat Transfer
  • Internal Combustion Engines
  • Materials
  • Measurement
  • Organometallic Compounds
  • Spark Plugs
  • Thermal Conductivity
  • Thermocouples

Fields of Study

  • Engineering

Readers

  • Combustion and Flow Dynamics.
  • Internal Combustion Engine (ICE) Technology.