TRANSPORT OF ENERGY BY DISTURBANCES IN ARBITRARY STEADY FLOWS

被引:106
作者
MYERS, MK
机构
[1] The George Washington University, Joint Institute for Advancement of Flight Sciences, NASA Langley Research Center, Hampton VA 23665
关键词
D O I
10.1017/S0022112091002434
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
An exact equation governing the transport of energy associated with disturbances in an arbitrary steady flow is derived. The result is a generalization of the familiar concept of acoustic energy and is suggested by a perturbation expansion of the general energy equation of fluid mechanics. A disturbance energy density and flux are defined and identified as exact fluid dynamic quantities whose leading-order regular perturbation representations reduce in various special cases to previously known results. The exact equation on disturbance energy is applied to a simple example of nonlinear wave propagation as an illustration of its general utility in situations where a linear description of the disturbance is inadequate.
引用
收藏
页码:383 / 400
页数:18
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