Correlation of Exhaust-Valve Temperatures with Engine Operating Conditions and Valve Design

Abstract

A semiempirical equation correlating exhaust-valve temperatures with engine operating conditions and exhaust-valve design has been developed. The correlation is based on the theory correlating engine and cooling variables developed in a previous NACA report. In addition to the parameters ordinarily used in the correlating equation, a term is included in the equation that is a measure of the resistance of the complex heat-flow paths between the crown of the exhaust valve and a point on the outside surface of the cylinder head. A means for comparing exhaust valves of different designs with respect to cooling is consequently provided. The necessary empirical constants included in the equation were determined from engine investigations of a large air-cooled cylinder. Tests of several valve designs showed that the calculated and experimentally determined exhaust-valve temperatures were in good agreement.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1945
Accession Number
ADB805961

Entities

People

  • J. C. Sanders
  • M. A. Zipkin

Organizations

  • Glenn Research Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Agreements
  • Air Cooled
  • Air Pressure
  • Air Temperature
  • Coefficients
  • Combustion
  • Combustion Chambers
  • Cooling
  • Equations
  • Exhaust Valves
  • Fuel Air Ratio
  • Heat Transfer
  • Heat Transmission
  • Measurement
  • Resistance
  • Spark Plugs
  • Thermal Resistance

Fields of Study

  • Engineering

Readers

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