Velocity Vector Determination from Multiple-Sensor Pneumatic Probe Measurements
Loading...
Authors
Shreeve, R.P.
Anderson, D.J.
Olson, J.A.
Subjects
Advisors
Date of Issue
1977-11
Date
Publisher
AIAA Journal
Language
Abstract
Design data for compressors are often derived from measurements made with multiple-sensor pneumatic probes. Although it is generally admitted that the presence of a probe alters the flow to some extent, few attempts have been made to evaluate and to correct probe readings for the interference that they produce. The goal of the present work was to measure the velocity distribution between blade rows of a small transonic compressor (11-in. o.d. and 2-in. blade height), operating subsonically. Different probes were used in the compressor annulus and were also applied to measure uniform temperature flows in pipes, free jets, and annular ducts. A useful method for representing probe characteristics and correcting for the presence of flow boundaries was devised. The probe calibration away from boundaries was represented by two interrelated polynomials for the pitch angle and velocity magnitude. In application, the probe-pressure measurements were reduced, using a computer offline and distribution of temperature (measured separately) to velocity magnitude and pitch angle. The departure of probe measurements near a flow boundary was then treated as being a self-induced flow effect. The effect was examined in known flows and represented analytically. The analytic representation of the calibration and of the corrections allowed a routine reduction of probe data from compressor surveys. The method can be applied generally to probes having four or five sensors for the measurement of pitch angle, yaw angle, and velocity magnitude. The measurements made with different probes near to flow boundaries showed that errors could be surprisingly large or very small depending on particular design features. A new probe which also incorporated a temperature sensor was designed and used successfully to transonic Mach numbers.
Type
Article
Description
Series/Report No
Department
Organization
Identifiers
NPS Report Number
Sponsors
This research was sponsored by the Naval Air Systems Command, Code 310, under the cognizance of Dr. H. J. Mueller.
Funder
Format
2 p.
Citation
Shreeve, R. P., D. J. Anderson, and J. A. Olson. "Velocity Vector Determination from Multiple-Sensor Pneumatic Probe Measurements." AIAA Journal 15.11 (1977): 1539-1540.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.