Fundamental Aspects of NO IR Spectroscopy in High T and P Air
Abstract
Research is proposed to extend a novel thermometer for high-temperature (and highpressure)air to enable temperature measurements in the range of ground-test facilities needed toevaluate new propulsion concepts. Previous work at Stanford postulated that the equilibrium molefraction of NO in air at high temperatures (T>1200K) could be used to infer temperature includingthe high-pressure and high-temperature air flows used in testing propulsion concepts important tothe Air Force. In current work sponsored by the T and E program, a proof-of-concept has beendemonstrated to infer temperature in air for 1500<T<3000 K and up to 150 atmospheres pressurefrom infrared (IR) laser absorption measurements of NO. Research to build the fundamentalspectroscopic database for high-temperature NO needed to support accurate measurements wasbegun, and here we propose to extend the fundamental database. The proposed work consists ofthree tasks: (1) extend the high-temperature NO spectroscopic database to additional transitionsto allow use over a wider range of test conditions for accurate temperature measurements in larger(or smaller) test facilities, (2) validate the NO spectroscopic data over an increased range ofpressure and temperature, and (3) assemble, test and refine an NO chemical kinetic mechanism tobetter understand the range of conditions where an equilibrium NO mole fraction can be assumedand those conditions where the NO is not in chemical equilibrium and a two-line NO measurementof temperature is required. The goal of this work is to reduce uncertainty of temperature sensingin the high-temperature and high-pressure air flows needed by the Air Force to test new propulsionconcepts, and to allow this temperature sensing concept to be used over a much wider range of testconditions and facility geometry. The proposed research offers high potential to impactdevelopment of in-situ sensors for characterization of high-enthalpy air flows.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA95501810282
Entities
People
- Ronald Kent Hanson
Organizations
- Air Force Office of Scientific Research
- Stanford University
- United States Air Force