D. Cornelius et G. Raman, DISTURBANCE GROWTH TRIGGERED BY STEADY HEATING OF A JETS NOZZLE EXIT BOUNDARY-LAYER, Physics of fluids, 7(10), 1995, pp. 2304-2306
Experiments were conducted to investigate how heating only the nozzle
exit boundary layer of an axisymmetric jet, with an unheated potential
core, affects disturbance growth in the initial shear layer. The exit
boundary layer had a minimum density ratio of 0.74, was laminar, and
had a constant momentum thickness (theta) for all levels of nozzle hea
ting used in this study. The fluctuating velocity (u') and temperature
(t') in the exit boundary layer increased monotonically with increasi
ng nozzle temperature. Low-amplitude acoustic excitation produced a mo
re rapid growth of coherent velocity fluctuations for the heated case
than for the unheated. (C) 1995 American Institute of Physics.