Small, multielement probes are described which measure total pressure and temperature coincidentally at one or several points in gas stream

Dudzinski, T. J.

Glawe, G. E.

Krause, L. N.

English

NASA Technical Reports Server

NASA TECH BRIEF 
Lewis Research Center S
December 1972	 B72-l07l6 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA. Code KT, Washington, D.C. 20546. 
A Multielement Probe for Coincident

Temperature and Pressure Measurements 
Sensing Element Shield 
0 
'a
The problem: 
Total pressure and temperature measurements for 
)mpressor and turbine research and other general 
tudies in experimental fluid mechanics are convention-
ally made using probes located at different points in the 
as stream. This introduces problems in data reduction 
and means for obtaining such measurements simul-
taneously at the same points in the gas stream are 
deirab1e.
The solution: 
A small, multielement probe which measures total 
pressure and temperature coincidentally at one or several 
points in a gas stream. 
How it's done: 
The basic embodiment of the probe is the installation 
of both a bare-wire thermocouple (0.3 mm diameter 
wire) and a total-head tube (1 mm OD.) inside a small 
(continued overleaf) 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19720000715 2020-03-17T03:43:08+00:00Z
oval-shaped shield tube (about 2.5 by 5 mm inlet open-
ing) which itself acts in part as a total-head tube. A 
photograph of a probe with five such elements is shown 
in the figure. 
Notes: 
1. Although this probe was developed primarily for use 
in rotating machinery research, it is applicable where-
ever requirements for multiple measurement exist. 
2. The following documentation may be obtained from: 
National Technical Information Service 
Springfield, Virginia 22151 
Single document price $3.00 
(or microfiche $0.95) 
Reference: NASA TM-X-2577 (N72-2635 1), 
A Probe for Measuring Temperature and Pres-
sure at the Same Points in a Gas Stream
Technical questions may be directed to: 
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B72-10716 
Patent status: 
NASA has decided not to apply for a patent. 
Source: Lloyd N. Krause, George E. Glawe, and
Thomas J. Dudzinski
Lewis Research Center
(LEW-1 1775)
LI 
B72-10716
	 Category 06	 It


A multielement probe for coincident temperature and pressure measurements

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