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.