Pressure Probes

Figure 4.6. Inlet 5-hp during a measurement (left), various multi-hole probes (right).​
Figure 4.6. Inlet 5-hp during a measurement (left), various multi-hole probes (right).​

A large set of pneumatic probes is available in the laboratory, and new probes can be built to suit the requirement for the measurement. Additive manufacturing is used to produce probes with complex shapes in metal (Ti/Inconel) with pneumatic channels down to 0.3 mm inner diameter. As well, traditional manufacturing methods are used to manufacture probes from stainless steel pipes with the inner channel diameters down to 0.15 mm. The possibility to customise probes and an in-house calibration process make the pneumatic measurement very versatile. A selection of existing probes and their dimensions are summarized in Table 4.5. Typical results from a flow field measurement by a multi-hole probe are shown in images below where the total pressure coefficient, swirl angle and streamwise vorticity are shown.​

Table 4.5. List of available pneumatic probes in the laboratory.

Probe description

Number of holes

Output

Quantity of probes

Tip dimension, mm

In-house, straight

7

Ptot, Pstat, pitch, yaw, 3 velocity components

3

2-3.5

In-house, L-shape

7

Ptot, Pstat, pitch, yaw, 3 velocity components

1

2.1

In-house, straight

5

Ptot, Pstat, pitch, yaw, 3 velocity components

5+

1.5-5

Aeroprobe Corp., L-shape

5

Ptot, Pstat, pitch, yaw, 3 velocity components

1

1.6-5

In-house, L-shape

3

Ptot, Pstat, swirl, 2 velocity components

1

2

In-house, wedge

3

Ptot, Pstat, swirl, 2 velocity components

1

2


Aeroprobe Corp., Omniprobe

12

Ptot, Pstat, pitch, yaw, 2 velocity components

1

6

In-house, boundary layer Pitot tubes

1

Ptot near walls

10+

0.2-1.5

In-house, Kiel probe

1

Ptot at high flow angle variations

5+

3

In-house and commercial Prandtl, Pitot tubes

1-2

Ptot and Pstat

50+

0.2-15


Figure 4.7. A typical outlet plane (Plane B) measured by a 7-hp in the TRS/EEM facility. Example data show the distributions of

Figure 4.7. A typical outlet plane (Plane B) measured by a 7-hp in the TRS/EEM facility. Example data show the distributions of the total pressure coefficient (left), swirl angle (mid) and streamwise vorticity (right).​​

Published: Thu 28 Mar 2019.