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90°-deflection

Optimization of a 90° - pipe bend

A research topic of the engineering office Dr. Jan Forkert
is the flow optimization of a 90 ° - pipe bend.

Basis for the optimization is a "normal" pipe bend with the
following geometric dimensions:

Hydraulic diameter of the pipe bend d: 80 mm
Radius of the pipe bend r: 458 mm
Ratio r / d: 5.73

The following picture shows the pipe bend, which was
tested on the
aerodynamic test stand. The fluid dynamic
parameters of this bend serve for comparison with the
optimized bends. The optimized tube sheet can not be
shown here for certain obvious reasons. A description of
the aerodynamic test stand is
here.

As a transition from the round output of the aerodynamic
test stand to the square entrance of the pipe bend serves
a confusor.

The comparison tests were started with the deflection of
the flow by 90 °.

The test arrangement shows the accompanying picture.

After the confusor and before the pipe bend was mounted
a corresponding linear inlet element with a length of 1000
mm and the same element after the pipe bend as a linear
outlet element.

The results of the tests were summarized in the graph
below.

Finding the optimal form of the pipe bend could achieve
a significant disgrace of pressure loss.

In the subsequent tests the flow was deflected by 180 °.
The corresponding test arrangement shows the
accompanying picture.

The results of the tests were summarized in the graph below..

To present the results even more significant, the tests will
be continued with an pipe ned, which the ratio r/d = 0,5.

Forkert Technology Services GmbH
Allee der Kosmonauten 28
D-12681 Berlin
Germany
Phone: +49(0)30 / 548 00 450
Fax:     +49(0)30 / 548 01 706
eMail: info@forkert-t-s.com

 Short presentation of technology

 Corporate Brochure

Flow patterns for various 90°-flow deflections.

Test arrangement for the deflection of the flow by 90°.

Test arrangement for the deflection of the flow by 180°.