Pressure, temperature, and density measurements using high-resolution N2 cars

M. A. Woodmansee, J. P. Kuehner, R. P. Lucht, J Craig Dutton

Research output: Contribution to conferencePaper

Abstract

Mean pressure, temperature, and density measurements have been made in a gas cell and along the centerline of an underexpanded jet using highresolution N2 CARS. This method takes advantage of the line-broadening effects and population shifts of the rotational structure in the nitrogen (u = 0 → 1) Q-branch which are pressure- and temperature-sensitive. Experimental CARS spectra were acquired with high spectral resolution, Δω = 0.16-0.18cm-1. Theoretical spectra, created by a N2 spectral modeling program, were fit to the experimental spectra in a least-squares manner. Temperature and pressure were determined as adjustable parameters in the least-squares fit and density was then determined through an equation-of state. For gas cell pressures between 1 and 5 arm, the pressure values extracted from the CARS spectra exhibited an approximately 0.15 atm bias above the transducer pressures, probably because of Raman saturation effects. However, in the underexpanded jet measurements, our Stokes laser power was lower and agreement between measured and predicted pressures and temperatures along the jet centerline was excellent. The potential of performing pressure and temperature measurements on single laser shots was also examined.

Original languageEnglish (US)
StatePublished - Jan 1 1998
Event34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1998 - Cleveland, United States
Duration: Jul 13 1998Jul 15 1998

Other

Other34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1998
CountryUnited States
CityCleveland
Period7/13/987/15/98

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Control and Systems Engineering
  • Aerospace Engineering

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  • Cite this

    Woodmansee, M. A., Kuehner, J. P., Lucht, R. P., & Dutton, J. C. (1998). Pressure, temperature, and density measurements using high-resolution N2 cars. Paper presented at 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1998, Cleveland, United States.