On the efficiency of active flow control with pneumatic jets at Mach numbers between 0.3 and 0.7

On the efficiency of active flow control with pneumatic jets at Mach numbers between 0.3 and 0.7 The project generally investigates the effect of pneumatic vortex generators on flows within a Mach number range of $$M_{\infty} =$$ M ∞ = 0.3–0.7. The efficiency of pneumatic jet actuators to control flow separation was investigated since years. It has been shown that at low Mach numbers the separation of boundary layers can be delayed and avoided, if the velocity ratio between the actuator jet and the free-stream is sufficiently high and the orientation of the jet axis is properly chosen. However, with increasing free-stream velocity, the ratio decreases as w jet must stay below the speed of sound to avoid significant losses due to shock-waves. Thus, the effectivity of slotted pneumatic jet actuators becomes questionable. The scope of this investigation is to identify the potential of this active flow control method at technical relevant Mach numbers. The blowing height is shown as a function of varying Mach number M ∞, velocity ratio w jet/u ∞ and Reynolds number Re set by the total pressure of the test facility p t. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

On the efficiency of active flow control with pneumatic jets at Mach numbers between 0.3 and 0.7

Loading next page...
 
/lp/springer_journal/on-the-efficiency-of-active-flow-control-with-pneumatic-jets-at-mach-vXfAsXh6zG
Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2014 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-014-1683-y
Publisher site
See Article on Publisher Site

Abstract

The project generally investigates the effect of pneumatic vortex generators on flows within a Mach number range of $$M_{\infty} =$$ M ∞ = 0.3–0.7. The efficiency of pneumatic jet actuators to control flow separation was investigated since years. It has been shown that at low Mach numbers the separation of boundary layers can be delayed and avoided, if the velocity ratio between the actuator jet and the free-stream is sufficiently high and the orientation of the jet axis is properly chosen. However, with increasing free-stream velocity, the ratio decreases as w jet must stay below the speed of sound to avoid significant losses due to shock-waves. Thus, the effectivity of slotted pneumatic jet actuators becomes questionable. The scope of this investigation is to identify the potential of this active flow control method at technical relevant Mach numbers. The blowing height is shown as a function of varying Mach number M ∞, velocity ratio w jet/u ∞ and Reynolds number Re set by the total pressure of the test facility p t.

Journal

Experiments in FluidsSpringer Journals

Published: Apr 2, 2014

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off