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Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781725003941 Category : Languages : en Pages : 36
Book Description
A new algorithm for five-hole probe calibration and data reduction using a non-nulling method is developed. The significant features of the algorithm are: (1) two components of the unit vector in the flow direction replace pitch and yaw angles as flow direction variables; and (2) symmetry rules are developed that greatly simplify Taylor's series representations of the calibration data. In data reduction, four pressure coefficients allow total pressure, static pressure, and flow direction to be calculated directly. The new algorithm's simplicity permits an analytical treatment of the propagation of uncertainty in five-hole probe measurement. The objectives of the uncertainty analysis are to quantify uncertainty of five-hole results (e.g., total pressure, static pressure, and flow direction) and determine the dependence of the result uncertainty on the uncertainty of all underlying experimental and calibration measurands. This study outlines a general procedure that other researchers may use to determine five-hole probe result uncertainty and provides guidance to improve measurement technique. The new algorithm is applied to calibrate and reduce data from a rake of five-hole probes. Here, ten individual probes are mounted on a single probe shaft and used simultaneously. Use of this probe is made practical by the simplicity afforded by this algorithm. Reichert, Bruce A. and Wendt, Bruce J. Glenn Research Center NASA-TM-106458, E-8319, NAS 1.15:106458 RTOP 505-62-52...
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781725003941 Category : Languages : en Pages : 36
Book Description
A new algorithm for five-hole probe calibration and data reduction using a non-nulling method is developed. The significant features of the algorithm are: (1) two components of the unit vector in the flow direction replace pitch and yaw angles as flow direction variables; and (2) symmetry rules are developed that greatly simplify Taylor's series representations of the calibration data. In data reduction, four pressure coefficients allow total pressure, static pressure, and flow direction to be calculated directly. The new algorithm's simplicity permits an analytical treatment of the propagation of uncertainty in five-hole probe measurement. The objectives of the uncertainty analysis are to quantify uncertainty of five-hole results (e.g., total pressure, static pressure, and flow direction) and determine the dependence of the result uncertainty on the uncertainty of all underlying experimental and calibration measurands. This study outlines a general procedure that other researchers may use to determine five-hole probe result uncertainty and provides guidance to improve measurement technique. The new algorithm is applied to calibrate and reduce data from a rake of five-hole probes. Here, ten individual probes are mounted on a single probe shaft and used simultaneously. Use of this probe is made practical by the simplicity afforded by this algorithm. Reichert, Bruce A. and Wendt, Bruce J. Glenn Research Center NASA-TM-106458, E-8319, NAS 1.15:106458 RTOP 505-62-52...
Author: Joint Institute for Aeronautics and Acoustics. Joint Institute for Aeronautics and Acoustics Publisher: ISBN: Category : Languages : en Pages : 88
Author: Vijay Ramakrishnan Publisher: ISBN: Category : Languages : en Pages :
Book Description
This thesis presents the development of calibration and data-reduction algorithms for non-conventional multi-hole pressure probes. The algorithms that have been developed for conventional 5- and 7-hole probes are not optimal for probes with port arrangements (on the probe tip) that are non-conventional. Conventional algorithms utilize the axisymmetry of the port distribution pattern to define the non-dimensional pressure coefficients. These coefficients are typically defined specifically for these patterns, but fail to correctly represent different patterns of port arrangements, such as patterns without axisymmetry or regularity. The algorithms introduced herein can handle any pattern of port arrangement, from axisymmetric and regular to random. Moreover, they eliminate the need to separate the measurement domain of a probe to "low-angle" and "high-angle" regimes, typical in conventional 5- and 7-hole-probe algorithms that require two different sets of pressure coefficient definitions and procedures. Additionally, the algorithms have been formulated such that they facilitate redundancy implementations, especially in applications where such redundancy is important, such as air-data systems. The developed algorithms are first applied to a non-conventional probe, a nearly omni-directional 18-hole probe, and demonstrate very high flow measurement accuracy. Subsequently, the algorithms were applied to a new 12-hole, nearly omni-directional, flow velocity measurement probe capable of measuring reversed flows. The new 12-hole design offers several advantages over a previously developed, 18-hole, nearly omni-directional probe. The probe is optimized in the sense that, regardless of the flow direction, it allows calculation of the 4 unknown flow quantities, i.e. the two flow angles, the velocity magnitude and the static pressure, with the minimum necessary number of holes/ports on the probe tip. This probe also has a non-conventional arrangement of its pressure ports and therefore the new calibration and data-reduction algorithms can be effectively employed. With theoretically generated pressure data for the 12-hole probe, the coefficient definitions are analyzed and found to be well-behaved.
Author: Mark D'imperio Publisher: ISBN: Category : Languages : en Pages :
Book Description
A five-hole probe is a unique measuring device that can provide information on a flow field's three dimensional velocity vector. Many laboratories studying turbomachinery can utilize these probes to gather important information on complex flows that CFD software cannot always provide accurately. However, these probes can be difficult to calibrate and many laboratories do not have the capability of running their own calibrations. Often, they have to rely on the manufacturer's original calibration which can become inaccurate over time. This thesis presents the construction and validation of a five-hole probe calibration system.The calibration system designed in this research produces an air-jet in which the velocity and pressure can be measured by pressure taps built into the sides of the rig's piping. The system involves a series of pipes with a section of packed straws and three screens to reduce turbulence and straighten the flow in the system. To handle the probe's position and orientation, a traverse and rotary table system was built to control the probe both manually and through automation. The probe can then be orientated at various pitch and yaw angles to gather calibration data in the air-jet.This thesis demonstrates calibration runs for the intended use of the probe at Re[almost equal to]4842. After running repeated tests it was determined that the probe could produce reliable data for ranges of ±10o at this Reynold's number. Having the system in the lab also gives the ability to recalibrate the probe for other values for Re which may have other ranges of useable data.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 700
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722890629 Category : Languages : en Pages : 26
Book Description
A technique is presented for the calibration of a hemispherical tipped 0.125 inch diameter 5-hole probe. The derivation of equations from the potential flow over a sphere relating the flow angle and velocity to pressure differentials measured by the probe is presented. The technique for acquiring the calibration data and the technique used to calculate the calibration coefficients are presented. The accuracy of the probe in both the uniform calibration flow field and the nonuniform flow field over a 75 degree swept delta wing is discussed. Kjelgaard, Scott O. Langley Research Center RTOP 505-60-11-03...
Author: National Aeronautics and Space Administration (NASA)
Author: National Aeronautics and Space Administration (NASA)
Author: Bruce A. Reichert
Author: Joint Institute for Aeronautics and Acoustics. Joint Institute for Aeronautics and Acoustics
Author: Vijay Ramakrishnan
Author: A.L. Treaster
Author: Mark D'imperio
Author: Scott O. Kjelgaard
Author: 
Author: National Aeronautics and Space Administration (NASA)
Author: Frank W. Spaid