scholarly journals Discussion: “A Four Hole Pressure Probe for Fluid Flow Measurements in Three Dimensions” (Shepherd, I. C., 1981, ASME J. Fluids Eng., 103, pp. 590–594)

1982 ◽  
Vol 104 (1) ◽  
pp. 126-127
Author(s):  
M. W. McBride
Keyword(s):  
Fluid Flow ◽  
Three Dimensions ◽  
Pressure Probe ◽  
Flow Measurements ◽  
Hole Pressure

A Four Hole Pressure Probe for Fluid Flow Measurements in Three Dimensions

1981 ◽  
Vol 103 (4) ◽  
pp. 590-594 ◽  
Author(s):  
I. C. Shepherd
Keyword(s):  
Fluid Flow ◽  
Three Dimensions ◽  
Central Hole ◽  
Pressure Probe ◽  
Redundant Information ◽  
Mean Flow ◽  
Flow Measurements ◽  
Hole Pressure ◽  
Dependent Flow

A pressure probe which facilitates measurement of mean flow quantities in three dimensions simultaneously is described. Its main feature is a tip shaped like the frustrum of a pyramid, with three-side holes equispaced around a central hole. Flow quantities are related to the hole pressures by calibration, so that the tedious procedure of nulling or pressure balancing can be avoided. The advantages of this configuration over five-hole probes are that a simpler probe with a smaller head results, fewer pressures need to be recorded and because no redundant information is collected, determination of the dependent flow quantities is simpler and unambiguous.

scholarly journals On-board eight-hole pressure probe system to measure wind speed with UAVs

2021 ◽  
Author(s):  
Andrey Shevchenko ◽  
Leonid Afanasiev ◽  
Dmitry Chechin ◽  
Andrey Shmakov
Keyword(s):  
Wind Speed ◽  
Pressure Probe ◽  
Hole Pressure ◽  
Probe System

Investigation of the Flow Field in a HP Turbine Stage for Two Stator-Rotor Axial Gaps: Part II — Unsteady Flow Field

2006 ◽  
Author(s):  
P. Gaetani ◽  
G. Persico ◽  
V. Dossena ◽  
C. Osnaghi
Keyword(s):  
Flow Field ◽  
Unsteady Flow ◽  
Dominant Role ◽  
Outer Part ◽  
Secondary Flows ◽  
Pressure Probe ◽  
Turbine Stage ◽  
Mean Flow ◽  
Tip Leakage Flow ◽  
Flow Measurements

An extensive experimental analysis was carried out at Politecnico di Milano on the subject of unsteady flow in high pressure (HP) turbine stages. In this paper the unsteady flow measured downstream of a modern HP turbine stage is discussed. Traverses in two planes downstream of the rotor are considered and, in one of them, the effects of two very different axial gaps are investigated: the maximum axial gap, equal to one stator axial chord, is chosen to “switch off” the rotor inlet unsteadiness, while the nominal gap, equal to 1/3 of the stator axial chord, is representative of actual engines. The experiments were performed by means of a fast-response pressure probe, allowing for two-dimensional phase-resolved flow measurements in a bandwidth of 80 kHz. The main properties of the probe and the data processing are described. The core of the paper is the analysis of the unsteady rotor aerodynamics; for this purpose, instantaneous snapshots of the rotor flow in the relative frame are used. The rotor mean flow and its interaction with the stator wakes and vortices are also described. In the outer part of the channel only the rotor cascade effects can be observed, with a dominant role played by the tip-leakage flow and by the rotor tip passage vortex. In the hub region, where the secondary flows downstream of the stator are stronger, the persistence of stator vortices is slightly visible in the maximum stator-rotor axial gap configuration, while in the minimum stator-rotor axial gap configuration the interaction with the rotor vortices dominates the flow field. A fair agreement with the wakes and vortices transport models has been achieved. A discussion of the interaction process is reported giving particular emphasis to the effects of the different cascade axial gaps. Some final considerations on the effects of the different axial gap over the stage performances are reported.

Fluid-Flow Measurements

2018 ◽  
pp. 457-507
Author(s):  
Francis S. Tse ◽  
Ivan E. Morse
Keyword(s):  
Fluid Flow ◽  
Flow Measurements
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