DE2719664A1 - Measurement probe head for flowing gases - has multiple test opening to facilitate probe attitude control - Google Patents

Abstract

A multiple aperture flow measurement probe head is for use in flowing gases, typically in a wind tunnel in which a number of apertures are arranged round a central main aperture to allow probe attitude control. The head consists basically of a bundle of open tubes arranged in an outer tube clamp, so that the central main tube is used to monitor the gas flow while the surrounding, smaller tubes, allow a control network to align the head with the gas flow.

Description

Title: Probe heads made from tube bundles

Description The invention relates to probe heads for receiving Measuring pressure Such measuring probe heads are necessary e.g. in fluidic engineering Experiments to draw conclusions about the flow such as flow velocity and To be able to make flow direction.

For this purpose, probe heads are made from basic bodies that have specific Have basic body contours and are embedded in the predominantly pressure bores are. The measuring pressures are taken with pipes. A summary presentation Such probe heads, which also reflect the state of the art, can be found in the book by W. Wuest, Flow Measurement Technology, Verlog Vieweg, Braunschweig (1969), Pages 58 to 83. With a large number of pressures to be decreased, structural ones result Difficulties and in particular are such probes for special purposes such as E.g. for the measurement of reverberation flow fields, it cannot be reduced in size sufficiently. In addition, the narrow pipelines cause a strong attenuation of the measuring pressures.

The invention is based on the object of providing a large number of measuring pressures record in a very small space without the need for a mostly difficult follow-up treatment of the Probe head is required and without excessive damping of the measuring pressures entry.

The object is achieved according to the invention in that the probe heads only consists of prefabricated pipelines that are suitably bundled with one another are connected.

The advantages achieved with the invention are in particular that the individual tubes can be prefabricated in series, with very thin tubes also being used can find, the sum of the pipe diameters directly results in the probe head diameter, so that the probe heads can be extremely reduced in size and, moreover, are light Manifolds, so-called ring lines, are to be formed. As wind tunnel tests have shown, these are disturbing If the flow field to be measured is less probable, the measurement pressures are recorded more correctly and attenuate them less.

An exemplary embodiment of the invention is shown in the drawing and is described in more detail below. 1 shows a so-called 6-hole probe for measuring a spatial flow field. The total pressure of the flow will be recorded on the central tube and forwarded directly. Two diagonally opposite each other Ground tubes allow the probe to be aligned with the direction of flow or the determination of the direction of flow for a given probe position. The interrupted outer pipe holds all pipes together. Pushed into the gaps Pipes, which are also used to transfer pressure, fix the individual pipes. Simultaneously the resulting annular gap absorbs the static pressure of the flow. For sealing only adhesive bonds at the beginning of the outer tube and at its end are required.

L e r s e i t e

Claims (2)

Title: Probe heads made from tube bundles Patent claims probe heads for recording measuring pressures, characterized in that they are only made of prepared, suitably bundled tubes exist, which allow the recording of the measuring pressure and forward them directly. 2. Probe heads according to claim 1, characterized in that they are too a so-called 6 - hole probe are bundled, which in particular the measurement of flow fields allowed.