Measurement of -- Gas Temperature in an Engine by the VELOCITY OF SOUND METHOD

Abstract

<div class="section abstract"><div class="htmlview paragraph">THIS paper outlines a new method of measuring end-gas temperatures within the cylinder of an operating engine. The new instrument measures the acoustical properties by the pulse method, transmitting an acoustical impulse through a gas path of known length and measuring the time of propagation through the gas. The method yields a value for the average velocity of sound in the path.</div><div class="htmlview paragraph">The authors describe the instrument and engine modifications necessary. The results of tests are also discussed, with a detailed description of one series.</div><div class="htmlview paragraph">The <span class="xref">appendixes</span> outline the mathematical steps of finding the sound velocity in gas mixtures and the fuel-air cycle for the detailed series of tests.</div></div>