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

Livengood, J. C.; Taylor, Charles Fayette; Wu, Peng

doi:10.4271/580064

Cited by 27 publications

(4 citation statements)

References 2 publications

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“…The temperatures of unburned gases in the combustion chamber calculated from the data shown in figure 6 are plotted in figure 7. These temperatures were obtained from the pressure history and phase shift change data in the unburned gas region using equation (6). The solid curve in figure 7 shows the temperature of the unburned fuel-air mixture obtained from the heterodyne interferometry system measurements.…”

Section: Transient Temperature Of Unburned Gas Compressed By Flame De...mentioning

confidence: 99%

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Unburned gas temperature measurement in a spark-ignition engine using fibre-optic heterodyne interferometry

Kawahara

Tomita

Kamakura

2001

Meas. Sci. Technol.

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A fibre-optic heterodyne interferometry system was developed to obtain the temperature histories of an unburned mixture with high temporal resolution non-intrusively. In laser interferometry, the effective optical path length of the test beam changes with the gas density and corresponding changes of the refractive index. Therefore, the temperature history of an unburned gas can be determined from the pressure and phase shift of the heterodyne signal. A polarization-preserving fibre is used to deliver the test beam to and from the test section, to improve the feasibility of the system as a sensor probe. The temperature of the unburned mixture in the end-gas region of a constant-volume combustion chamber and in an engine cylinder was measured during flame propagation. The accuracy of the measurements and the feasibility of this system are discussed. The measurement accuracy of our system was sufficient to be applied to temperature history measurement of an unburned gas compressed by flame propagation in a constant-volume combustion chamber. The uncertainty of this method is within ±10 K. The resolution of the temperature measurement is approximately 0.5 K, and is dependent on both the sampling clock speed of the A/D converter and the length of the test section. This fibre-optic heterodyne interferometry system can also be used for other applications that require a transient temperature with a fast response time.

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Section: Transient Temperature Of Unburned Gas Compressed By Flame De...mentioning

confidence: 99%

“…Techniques used to measure end-gas temperatures include the iodine absorption spectra [3], a two-wavelength infrared method [4] and an infrared radiation pyrometer [5]. Livengood et al [6] and Gluckstein and Walcutt [7] used a sound-velocity method to measure the gas temperature in a cylinder.…”

Section: Introductionmentioning

confidence: 99%

Unburned gas temperature measurement in a spark-ignition engine using fibre-optic heterodyne interferometry

Kawahara

Tomita

Kamakura

2001

Meas. Sci. Technol.

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“…The end-gas temperature was measured by recording absorption spectra of iodine by Chen et al [1], using a twowavelength infrared method by Agnew [2] and using an infrared radiation pyrometer by Burrows et al [3]. Livengood et al [4] applied a sound-velocity method to measurement of the gas temperature in a cylinder. This utilizes the fact that the sound velocity in gas is proportional to the square root of the gas temperature.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the temperature history of unburned gas before knocking in a spark-ignition engine using laser interferometry

Tomita

Hamamoto

Jiang

2000

Meas. Sci. Technol.

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It is very important to know the temperature history in a spark-ignition engine when the phenomenon of knocking is being studied. However, measurement of the gas temperature is not easy and some work has been done using laser diagnostics etc. In this study, the temperature history until the time of occurrence of knocking in a spark-ignition engine was measured by a form of laser interferometry designed especially for use in the combustion chamber. Not only the change in temperature but also the absolute value of the temperature could be determined with this interferometer, by utilizing the change of the gas density on the reference side. This is a non-intrusive measurement and high resolution is expected. The temperature resolution is about 5 K near the occurrence of knocking.

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“…6), the variation of the speed of sound (Ref. 7), dual wavelength infrared measurements (Ref. 8), the emission-absorption technique (Ref.…”

Section: Introductionmentioning

confidence: 99%

Measurements of Temperature and N2 Number Density in the Combustion Cylinder of a Compression Ignition Engine Utilizing Laser-Raman Diagnostics

Williams¹,

Lewis²,

Jones³

1981

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A p ro v d fo r pu bl~ic r e s e; ds t ribtio n u nli it ed . ARNOLD ENGINEERING DEVELOPMENT CUNTER ARNOLD AIR FORCE STATION, TENESSEE AIR FORCE SYSTEMS COMMAND UNITED STATES AIR FORCE NOTICESWhen U. S. Government drawings, specifications, or other data are used for any purpose other than a definitely related Government procurement operation, the Government thereby incurs no responsibility nor any obligation whatsoever, and the fact that the Government may have formulated, furnished, or in any way supplied the said drawins, specifications, or other data, is not to be regarded by implication or otherwise, or in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto.Qualified users may obtain copies of this report from the Defense Technical Information Center.References to named commercial products in this report are not to be considered in any sense a an indorsement of the product by the United States Air Force or the Government.This report has been reviewed by the Office of Public Affairs (PA) and is releasable to the National Technical Information Service (NTIS). At NTIS, it will be available to the general public, including foreign nations. APPROVAL STATEMENTThis report has been reviewed and approved. Approved for public release; distribution unlimited. Laser-Raman scattering has been used to measure temperature and nitrogen number density in the combustion cylinder of a specialized research CI engine.Measurements were made as a function of crank angle degrees (CAD) for unfueled operation at 500 and 1,000 rpm and for operation at 1,000 rpm using n-heptane as an alternate fuel to diesel fuel no. 2.A pulsed ruby laser system was the excitation source for the Raman scattering, and the CAD resolution of the ABSTRACT (Continued) measurements was 1.5 x 10 -4 to 0.36 degrees.

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

Cited by 27 publications

References 2 publications

Unburned gas temperature measurement in a spark-ignition engine using fibre-optic heterodyne interferometry

Unburned gas temperature measurement in a spark-ignition engine using fibre-optic heterodyne interferometry

Measurement of the temperature history of unburned gas before knocking in a spark-ignition engine using laser interferometry

Measurements of Temperature and N2 Number Density in the Combustion Cylinder of a Compression Ignition Engine Utilizing Laser-Raman Diagnostics

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