TY - JOUR
T1 - Hydrodynamic stability of a periodically unsteady swirling jet
AU - Carrara, Mark D.
AU - Hajj, Muhammad R.
PY - 2009
Y1 - 2009
N2 - The stability characteristics of a jet with a low-frequency time-dependent periodic swirl are determined. An analytical dispersion relation for the perturbations is obtained and solved numerically. Growth rates and celerities determined from this formulation are compared with predictions based on applying steady state analysis to instantaneous velocity profiles, i.e., the quasisteady approach. The results show that periodic unsteadiness in the swirl causes variations in the growth rates and celerities of the unstable modes. Furthermore, it is shown that the quasisteady approach is not applicable and fails to predict the magnitudes of these variations.
AB - The stability characteristics of a jet with a low-frequency time-dependent periodic swirl are determined. An analytical dispersion relation for the perturbations is obtained and solved numerically. Growth rates and celerities determined from this formulation are compared with predictions based on applying steady state analysis to instantaneous velocity profiles, i.e., the quasisteady approach. The results show that periodic unsteadiness in the swirl causes variations in the growth rates and celerities of the unstable modes. Furthermore, it is shown that the quasisteady approach is not applicable and fails to predict the magnitudes of these variations.
KW - Hydraulic jets
KW - Hydrodynamics
KW - Stability
KW - Velocity
UR - http://www.scopus.com/inward/record.url?scp=69249137154&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=69249137154&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)EM.1943-7889.0000022
DO - 10.1061/(ASCE)EM.1943-7889.0000022
M3 - Article
AN - SCOPUS:69249137154
SN - 0733-9399
VL - 135
SP - 1000
EP - 1005
JO - Journal of Engineering Mechanics
JF - Journal of Engineering Mechanics
IS - 9
ER -