General Reduced-Order Model to Design and Operate Synthetic Jet Actuators
Citation:
Persoons, T, General Reduced-Order Model to Design and Operate Synthetic Jet Actuators, AIAA JOURNAL, 50, 4, 2012, 916-927Download Item:
2011-05-J051381_FINAL.pdf (Published (author's copy) - Peer Reviewed) 1.387Mb
Abstract:
Synthetic jets are used in various applicat
ions from flow contro
l to thermal management
of electronics. Controlling the jet operating
point using a simple voltage to velocity
calibration becomes unreliable in case of ext
ernal pressure field disturbances or varying
actuator characteristics. This paper pres
ents a general lumped parameter model for a
synthetic jet actuator with electromagnetic
or piezoelectric driver. The fluidic model
accurately predicts the synthetic jet operati
ng point (i.e. Reynolds number and stroke
length) based on the measured cavity pre
ssure. The model requires only two empirical
coefficients characterizing
nozzle fluid damping and inertia
. These can be obtained via
calibration or estimated from pressure loss co
rrelations and the governing acoustic radiation
impedance. The model has been validated
experimentally for a ci
rcular and rectangular
orifice. The effect of nozzle damping on
the nonlinear system response is discussed.
Analytical expressions are given for the two resonance frequencies characterizing the system
response, as a function of the diaphragm a
nd Helmholtz resonance frequencies. The optimal
design of an impinging synthe
tic jet actuator is discusse
d in terms of the thermal and
acoustic efficiency. Guidelines for selectin
g the optimum combination of diaphragm and
Helmholtz resonance frequency are presente
d and compared to previous studies.
Author's Homepage:
http://people.tcd.ie/persoontDescription:
PUBLISHED
Author: PERSOONS, TIM
Type of material:
Journal ArticleSeries/Report no:
AIAA JOURNAL50
4
Availability:
Full text availableKeywords:
Synthetic jetSubject (TCD):
Smart & Sustainable Planet , TelecommunicationsDOI:
http://dx.doi.org/10.2514/1.J051381ISSN:
0001-1452Licences: