Design and Calibration of Seven Hole Probes for Flow Measurement PDF Download

Author: Crawford CRAWFORD (James)
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: James Douglas Crawford
Publisher:
ISBN:
Category :
Languages : en
Pages : 324

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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%.

Author: Gregory G. Zilliac
Publisher:
ISBN:
Category : Static pressure probes
Languages : en
Pages : 60

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Author: Vijay Ramakrishnan
Publisher:
ISBN:
Category :
Languages : en
Pages :

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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: L. Reed
Publisher:
ISBN:
Category :
Languages : en
Pages : 85

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This paper documents recent and past developments with respect to the seven-hole pressure probe. Included are discussions on probe design, construction, calibration, and measurement capabilities. The effects on probe measurements in shear flows, as well as methods of correction, are also included. Finally, research applications in the measurement of unknown flowfields are presented. As shown, the seven-hole pressure probe is a valuable and highly accurate device for qualitatively or quantitatively documenting unknown flowfields. (Author).

Author: Mark D'imperio
Publisher:
ISBN:
Category :
Languages : en
Pages :

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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: Christian W. Wenger
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Hong Yang Zhao
Publisher: Trans Tech Publications Ltd
ISBN: 3038262242
Category : Technology & Engineering
Languages : en
Pages : 2900

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Book Description
Collection of selected, peer reviewed papers from the 3rd International Conference on Advanced Design and Manufacturing Engineering (ADME 2013), 13-14 July, 2013, Anshan, China. The 547 papers are grouped as follows: Chapter 1: Advanced Manufacturing Technology; Chapter 2: Advanced Equipment Manufacture; Chapter 3: Fluid and Flow Engineering; Chapter 4: Dynamic Systems and Analysis, Machinery Dynamics and Dynamic Modelling; Chapter 5: Advanced Computer-Aided Design and Modelling Technologies in Mechanical Engineering and Mechanisms; Chapter 6: System Analysis and Industrial Engineering; Chapter 7: Innovative Design Methodology and Product Design; Chapter 8: Intelligent Optimization Design and Reverse Engineering; Chapter 9: Mechatronics, Automation and Control, Detection Technologies; Chapter 10: Industrial Robotics and Machine Vision, Navigation and GPS Technology; Chapter 11: Sensor Technologies; Chapter 12: Measurement and Monitoring Technologies; Chapter 13: Power, Energy, Microelectronic Technology and Embedded System; Chapter 14: Communication Technology, WEB and Network Engineering; Chapter 15: Signal and Intelligent Image, Video Information Processing, Data Mining; Chapter 16: Software Development and Application; Chapter 17: Computer Applications and Information Technologies in Industry and Engineering; Chapter 18: Production and Operation Management, Supply Chain, Electronic E-Commerce and Internet of Things Application; Chapter 19: Management and Education Engineering.

Author: Timothy T. Takahashi
Publisher:
ISBN:
Category :
Languages : en
Pages : 64

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Author: Cameron Tropea
Publisher: Springer Science & Business Media
ISBN: 3540251413
Category : Science
Languages : en
Pages : 1570

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Accompanying DVD-ROM contains ... "all chapters of the Springer Handbook."--Page 3 of cover.