کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
659165 1458090 2012 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simplified account of Rayleigh streaming for the description of nonlinear processes leading to steady state sound in thermoacoustic engines
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Simplified account of Rayleigh streaming for the description of nonlinear processes leading to steady state sound in thermoacoustic engines
چکیده انگلیسی
This paper focuses on the transient regime of wave amplitude growth and stabilization occuring in a standing wave thermoacoustic engine. Experiments are performed on a simple apparatus consisting of an open ended thermoacoustic oscillator with atmospheric air as working fluid. The results show that, even in that simple device, the transient regime leading to steady state sound exhibits complicated dynamics, like the systematic overshoot of wave amplitude before its final stabilization, and the spontaneous and periodic switch on/off of the thermoacoustic instability at constant heat power supply. A simplified model is then presented which describes wave amplitude growth from the coupled equations describing thermoacoustic amplification and unsteady heat transfer. In this model, the assumption of a one-dimensional and exponential temperature profile is retained and the equations describing heat transfer through the thermoacoustic core are substantially simplified into a set of ordinary differential equations. These equations include the description of two processes saturating wave amplitude growth, i.e. thermoacoustic heat pumping and heat convection by acoustic streaming. It is notably shown that accounting for the effect of acoustic streaming allows to reproduce qualitatively the overshoot process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 55, Issues 21–22, October 2012, Pages 6042-6053
نویسندگان
, , , ,