Author: Gregory G. ZilliacPublisher:
ISBN:
Category : Static pressure probes
Languages : en
Pages : 60
Book Description
Calibration of Seven-hole Pressure Probes for Use in Fluid Flows with Large Angularity
Author: Gregory G. ZilliacPublisher:
ISBN:
Category : Static pressure probes
Languages : en
Pages : 60
Book Description
Design and Calibration of Seven Hole Probes for Flow Measurement
Author: James Douglas CrawfordPublisher:
ISBN:
Category :
Languages : en
Pages : 324
Book Description
The calibration and use of seven hole pressure probes for hot flow measurement was studied extensively, and guidelines were developed for the calibration and use of these probes. The influence of tip shape, Reynolds number, calibration grid density, and curve fit were studied and reported. Calibration was done using the well established polynomial curve fit method of Gallington. An improvement to this method was proposed that improved the uniformity and magnitude of measurement error. A hemispherical tip was found to be less sensitive to manufacturing defects, and less sensitive to changes in tip Reynolds number than a conical tip. The response of the probes was found to be Reynolds number independent over a tip Reynolds number of 6000 for the entire calibrated range. For flows with an angle of attack less than approximately 20°, the response of the probe was found to be independent above Re = 3000. A minimum calibration grid density of 5° was recommended. Error in the measurement of high angle flows was found to increase significantly when the calibration grid was sparser than this. The response of the probe was found to contain features that were not properly represented by third order polynomial terms, and it was found that it was necessary to include fourth order terms in the polynomial curve fit. The uniformity of calibration error was found to improve significantly when the high angle sectors were calibrated using a small number of additional points from adjacent sectors. The calibration data sorting algorithm was modified to include a calibration point in a given sector if that sector's port read the highest pressure, or if that port read within a specified tolerance ("overlap pressure") of the highest pressure. An overlap pressure of 15-20% of the calibration flow dynamic pressure was found to decrease the maximum calibration errors by 10-15%.
Scientific and Technical Aerospace Reports
Author: Measurement in Fluid Mechanics
Author: Stavros TavoularisPublisher: Cambridge University Press
ISBN: 1009343629
Category : Technology & Engineering
Languages : en
Pages : 625
Book Description
Revised and expanded, this new edition will equip readers with a robust and practical understanding of experimental fluid mechanics.
Measurement of Air Flow Characteristics Using Seven-Hole Cone Probes
Author: Timothy T. TakahashiSpringer Handbook of Experimental Fluid Mechanics
Author: Cameron TropeaPublisher: Springer Science & Business Media
ISBN: 3540251413
Category : Science
Languages : en
Pages : 1570
Book Description
Accompanying DVD-ROM contains ... "all chapters of the Springer Handbook."--Page 3 of cover.
Maritime Technology and Engineering
Author: Carlos Guedes SoaresPublisher: CRC Press
ISBN: 1315731592
Category : Technology & Engineering
Languages : en
Pages : 1450
Book Description
Maritime Technology and Engineering includes the papers presented at the 2nd International Conference on Maritime Technology and Engineering (MARTECH 2014, Lisbon, Portugal, 15-17 October 2014). The contributions reflect the internationalization of the maritime sector, and cover a wide range of topics: Ports; Maritime transportation; Inland navigat
29th AIAA Fluid Dynamics Conference
Author: Calibration and Data Reduction Algorithms for Non-conventional Multi-hole Pressure Probes
Author: Vijay RamakrishnanPublisher:
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: